Loading...
Searching...
No Matches
FFmpegWriter.cpp
Go to the documentation of this file.
// Copyright (c) 2008-2024 OpenShot Studios, LLC, Fabrice Bellard
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#include <algorithm>
#include <iostream>
#include <cmath>
#include <ctime>
#include <unistd.h>
#include "FFmpegUtilities.h"
#include "FFmpegWriter.h"
#include "Exceptions.h"
#include "Frame.h"
#include "OpenMPUtilities.h"
#include "Settings.h"
#include "ZmqLogger.h"
using namespace openshot;
// Multiplexer parameters temporary storage
AVDictionary *mux_dict = NULL;
#if USE_HW_ACCEL
int hw_en_on = 1; // Is set in UI
int hw_en_supported = 0; // Is set by FFmpegWriter
AVPixelFormat hw_en_av_pix_fmt = AV_PIX_FMT_NONE;
AVHWDeviceType hw_en_av_device_type = AV_HWDEVICE_TYPE_VAAPI;
static AVBufferRef *hw_device_ctx = NULL;
AVFrame *hw_frame = NULL;
static int set_hwframe_ctx(AVCodecContext *ctx, AVBufferRef *hw_device_ctx, int64_t width, int64_t height)
{
AVBufferRef *hw_frames_ref;
AVHWFramesContext *frames_ctx = NULL;
int err = 0;
if (!(hw_frames_ref = av_hwframe_ctx_alloc(hw_device_ctx))) {
std::clog << "Failed to create HW frame context.\n";
return -1;
}
frames_ctx = (AVHWFramesContext *)(hw_frames_ref->data);
frames_ctx->format = hw_en_av_pix_fmt;
frames_ctx->sw_format = AV_PIX_FMT_NV12;
frames_ctx->width = width;
frames_ctx->height = height;
frames_ctx->initial_pool_size = 20;
if ((err = av_hwframe_ctx_init(hw_frames_ref)) < 0) {
std::clog << "Failed to initialize HW frame context. " <<
"Error code: " << av_err2string(err) << "\n";
av_buffer_unref(&hw_frames_ref);
return err;
}
ctx->hw_frames_ctx = av_buffer_ref(hw_frames_ref);
if (!ctx->hw_frames_ctx)
err = AVERROR(ENOMEM);
av_buffer_unref(&hw_frames_ref);
return err;
}
#endif // USE_HW_ACCEL
FFmpegWriter::FFmpegWriter(const std::string& path) :
path(path), oc(NULL), audio_st(NULL), video_st(NULL), samples(NULL),
audio_outbuf(NULL), audio_outbuf_size(0), audio_input_frame_size(0), audio_input_position(0),
initial_audio_input_frame_size(0), img_convert_ctx(NULL), num_of_rescalers(1),
rescaler_position(0), video_codec_ctx(NULL), audio_codec_ctx(NULL), is_writing(false), video_timestamp(0), audio_timestamp(0),
original_sample_rate(0), original_channels(0), avr(NULL), avr_planar(NULL), is_open(false), prepare_streams(false),
write_header(false), write_trailer(false), audio_encoder_buffer_size(0), audio_encoder_buffer(NULL) {
// Disable audio & video (so they can be independently enabled)
info.has_audio = false;
info.has_video = false;
// Initialize FFMpeg, and register all formats and codecs
AV_REGISTER_ALL
// auto detect format
auto_detect_format();
}
// Open the writer
void FFmpegWriter::Open() {
if (!is_open) {
// Open the writer
is_open = true;
// Prepare streams (if needed)
if (!prepare_streams)
PrepareStreams();
// Now that all the parameters are set, we can open the audio and video codecs and allocate the necessary encode buffers
if (info.has_video && video_st)
open_video(oc, video_st);
if (info.has_audio && audio_st)
open_audio(oc, audio_st);
// Write header (if needed)
if (!write_header)
WriteHeader();
}
}
// auto detect format (from path)
void FFmpegWriter::auto_detect_format() {
// Allocate the output media context
AV_OUTPUT_CONTEXT(&oc, path.c_str());
if (!oc) {
throw OutOfMemory(
"Could not allocate memory for AVFormatContext.", path);
}
// Determine what format to use when encoding this output filename
oc->oformat = av_guess_format(NULL, path.c_str(), NULL);
if (oc->oformat == nullptr) {
throw InvalidFormat(
"Could not deduce output format from file extension.", path);
}
// Update video codec name
if (oc->oformat->video_codec != AV_CODEC_ID_NONE && info.has_video)
info.vcodec = avcodec_find_encoder(oc->oformat->video_codec)->name;
// Update audio codec name
if (oc->oformat->audio_codec != AV_CODEC_ID_NONE && info.has_audio)
info.acodec = avcodec_find_encoder(oc->oformat->audio_codec)->name;
}
// initialize streams
void FFmpegWriter::initialize_streams() {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::initialize_streams",
"oc->oformat->video_codec", oc->oformat->video_codec,
"oc->oformat->audio_codec", oc->oformat->audio_codec,
"AV_CODEC_ID_NONE", AV_CODEC_ID_NONE);
// Add the audio and video streams using the default format codecs and initialize the codecs
video_st = NULL;
audio_st = NULL;
if (oc->oformat->video_codec != AV_CODEC_ID_NONE && info.has_video)
// Add video stream
video_st = add_video_stream();
if (oc->oformat->audio_codec != AV_CODEC_ID_NONE && info.has_audio)
// Add audio stream
audio_st = add_audio_stream();
}
// Set video export options
void FFmpegWriter::SetVideoOptions(bool has_video, std::string codec, Fraction fps, int width, int height, Fraction pixel_ratio, bool interlaced, bool top_field_first, int bit_rate) {
// Set the video options
if (codec.length() > 0) {
const AVCodec *new_codec;
// Check if the codec selected is a hardware accelerated codec
#if USE_HW_ACCEL
#if defined(__linux__)
if (strstr(codec.c_str(), "_vaapi") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_VAAPI;
hw_en_av_device_type = AV_HWDEVICE_TYPE_VAAPI;
} else if (strstr(codec.c_str(), "_nvenc") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_CUDA;
hw_en_av_device_type = AV_HWDEVICE_TYPE_CUDA;
} else {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 0;
hw_en_supported = 0;
}
#elif defined(_WIN32)
if (strstr(codec.c_str(), "_dxva2") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_DXVA2_VLD;
hw_en_av_device_type = AV_HWDEVICE_TYPE_DXVA2;
} else if (strstr(codec.c_str(), "_nvenc") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_CUDA;
hw_en_av_device_type = AV_HWDEVICE_TYPE_CUDA;
} else {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 0;
hw_en_supported = 0;
}
#elif defined(__APPLE__)
if (strstr(codec.c_str(), "_videotoolbox") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_VIDEOTOOLBOX;
hw_en_av_device_type = AV_HWDEVICE_TYPE_VIDEOTOOLBOX;
} else {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 0;
hw_en_supported = 0;
}
#else // unknown OS
new_codec = avcodec_find_encoder_by_name(codec.c_str());
#endif //__linux__/_WIN32/__APPLE__
#else // USE_HW_ACCEL
new_codec = avcodec_find_encoder_by_name(codec.c_str());
#endif // USE_HW_ACCEL
if (new_codec == NULL)
throw InvalidCodec("A valid video codec could not be found for this file.", path);
else {
// Set video codec
info.vcodec = new_codec->name;
}
}
if (fps.num > 0) {
// Set frames per second (if provided)
info.fps.num = fps.num;
info.fps.den = fps.den;
// Set the timebase (inverse of fps)
info.video_timebase.num = info.fps.den;
info.video_timebase.den = info.fps.num;
}
if (width >= 1)
info.width = width;
if (height >= 1)
info.height = height;
if (pixel_ratio.num > 0) {
info.pixel_ratio.num = pixel_ratio.num;
info.pixel_ratio.den = pixel_ratio.den;
}
if (bit_rate >= 1000) // bit_rate is the bitrate in b/s
info.video_bit_rate = bit_rate;
if ((bit_rate >= 0) && (bit_rate < 256)) // bit_rate is the bitrate in crf
info.video_bit_rate = bit_rate;
info.interlaced_frame = interlaced;
info.top_field_first = top_field_first;
// Calculate the DAR (display aspect ratio)
Fraction size(info.width * info.pixel_ratio.num, info.height * info.pixel_ratio.den);
// Reduce size fraction
size.Reduce();
// Set the ratio based on the reduced fraction
info.display_ratio.num = size.num;
info.display_ratio.den = size.den;
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::SetVideoOptions (" + codec + ")",
"width", width, "height", height,
"size.num", size.num, "size.den", size.den,
"fps.num", fps.num, "fps.den", fps.den);
// Enable / Disable video
info.has_video = has_video;
}
// Set video export options (overloaded function)
void FFmpegWriter::SetVideoOptions(std::string codec, int width, int height, Fraction fps, int bit_rate) {
// Call full signature with some default parameters
FFmpegWriter::SetVideoOptions(
true, codec, fps, width, height,
openshot::Fraction(1, 1), false, true, bit_rate
);
}
// Set audio export options
void FFmpegWriter::SetAudioOptions(bool has_audio, std::string codec, int sample_rate, int channels, ChannelLayout channel_layout, int bit_rate) {
// Set audio options
if (codec.length() > 0) {
const AVCodec *new_codec = avcodec_find_encoder_by_name(codec.c_str());
if (new_codec == NULL)
throw InvalidCodec("A valid audio codec could not be found for this file.", path);
else {
// Set audio codec
info.acodec = new_codec->name;
}
}
if (sample_rate > 7999)
info.sample_rate = sample_rate;
if (channels > 0)
info.channels = channels;
if (bit_rate > 999)
info.audio_bit_rate = bit_rate;
info.channel_layout = channel_layout;
// init resample options (if zero)
if (original_sample_rate == 0)
original_sample_rate = info.sample_rate;
if (original_channels == 0)
original_channels = info.channels;
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::SetAudioOptions (" + codec + ")",
"sample_rate", sample_rate,
"channels", channels,
"bit_rate", bit_rate);
// Enable / Disable audio
info.has_audio = has_audio;
}
// Set audio export options (overloaded function)
void FFmpegWriter::SetAudioOptions(std::string codec, int sample_rate, int bit_rate) {
// Call full signature with some default parameters
FFmpegWriter::SetAudioOptions(
true, codec, sample_rate, 2,
openshot::LAYOUT_STEREO, bit_rate
);
}
// Set custom options (some codecs accept additional params)
void FFmpegWriter::SetOption(StreamType stream, std::string name, std::string value) {
// Declare codec context
AVCodecContext *c = NULL;
AVStream *st = NULL;
std::stringstream convert(value);
if (info.has_video && stream == VIDEO_STREAM && video_st) {
st = video_st;
// Get codec context
c = AV_GET_CODEC_PAR_CONTEXT(st, video_codec_ctx);
// Was a codec / stream found?
if (c) {
if (info.interlaced_frame) {
c->field_order = info.top_field_first ? AV_FIELD_TT : AV_FIELD_BB;
// We only use these two version and ignore AV_FIELD_TB and AV_FIELD_BT
// Otherwise we would need to change the whole export window
}
}
} else if (info.has_audio && stream == AUDIO_STREAM && audio_st) {
st = audio_st;
// Get codec context
c = AV_GET_CODEC_PAR_CONTEXT(st, audio_codec_ctx);
} else
throw NoStreamsFound("The stream was not found. Be sure to call PrepareStreams() first.", path);
// Init AVOption
const AVOption *option = NULL;
// Was a codec / stream found?
if (c)
// Find AVOption (if it exists)
option = AV_OPTION_FIND(c->priv_data, name.c_str());
// Was option found?
if (option || (name == "g" || name == "qmin" || name == "qmax" || name == "max_b_frames" || name == "mb_decision" ||
name == "level" || name == "profile" || name == "slices" || name == "rc_min_rate" || name == "rc_max_rate" ||
name == "rc_buffer_size" || name == "crf" || name == "cqp" || name == "qp")) {
// Check for specific named options
if (name == "g")
// Set gop_size
convert >> c->gop_size;
else if (name == "qmin")
// Minimum quantizer
convert >> c->qmin;
else if (name == "qmax")
// Maximum quantizer
convert >> c->qmax;
else if (name == "max_b_frames")
// Maximum number of B-frames between non-B-frames
convert >> c->max_b_frames;
else if (name == "mb_decision")
// Macroblock decision mode
convert >> c->mb_decision;
else if (name == "level")
// Set codec level
convert >> c->level;
else if (name == "profile")
// Set codec profile
convert >> c->profile;
else if (name == "slices")
// Indicates number of picture subdivisions
convert >> c->slices;
else if (name == "rc_min_rate")
// Minimum bitrate
convert >> c->rc_min_rate;
else if (name == "rc_max_rate")
// Maximum bitrate
convert >> c->rc_max_rate;
else if (name == "rc_buffer_size")
// Buffer size
convert >> c->rc_buffer_size;
else if (name == "cqp") {
// encode quality and special settings like lossless
// This might be better in an extra methods as more options
// and way to set quality are possible
#if USE_HW_ACCEL
if (hw_en_on) {
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),63), 0); // 0-63
} else
#endif // USE_HW_ACCEL
{
switch (c->codec_id) {
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
case AV_CODEC_ID_AV1 :
c->bit_rate = 0;
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),63), 0); // 0-63
break;
#endif
case AV_CODEC_ID_VP8 :
c->bit_rate = 10000000;
av_opt_set_int(c->priv_data, "qp", std::max(std::min(std::stoi(value), 63), 4), 0); // 4-63
break;
case AV_CODEC_ID_VP9 :
c->bit_rate = 0; // Must be zero!
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value), 63), 0); // 0-63
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
av_opt_set_int(c->priv_data, "lossless", 1, 0);
}
break;
case AV_CODEC_ID_H264 :
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value), 51), 0); // 0-51
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
c->pix_fmt = PIX_FMT_YUV444P; // no chroma subsampling
}
break;
case AV_CODEC_ID_HEVC :
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value), 51), 0); // 0-51
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
av_opt_set_int(c->priv_data, "lossless", 1, 0);
}
break;
default:
// For all other codecs assume a range of 0-63
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value), 63), 0); // 0-63
c->bit_rate = 0;
}
}
} else if (name == "crf") {
// encode quality and special settings like lossless
// This might be better in an extra methods as more options
// and way to set quality are possible
#if USE_HW_ACCEL
if (hw_en_on) {
double mbs = 15000000.0;
if (info.video_bit_rate > 0) {
if (info.video_bit_rate > 42) {
mbs = 380000.0;
}
else {
mbs *= std::pow(0.912,info.video_bit_rate);
}
}
c->bit_rate = (int)(mbs);
} else
#endif // USE_HW_ACCEL
{
switch (c->codec_id) {
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
case AV_CODEC_ID_AV1 :
c->bit_rate = 0;
// AV1 only supports "crf" quality values
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value),63), 0);
break;
#endif
case AV_CODEC_ID_VP8 :
c->bit_rate = 10000000;
av_opt_set_int(c->priv_data, "crf", std::max(std::min(std::stoi(value), 63), 4), 0); // 4-63
break;
case AV_CODEC_ID_VP9 :
c->bit_rate = 0; // Must be zero!
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value), 63), 0); // 0-63
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
av_opt_set_int(c->priv_data, "lossless", 1, 0);
}
break;
case AV_CODEC_ID_H264 :
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value), 51), 0); // 0-51
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
c->pix_fmt = PIX_FMT_YUV444P; // no chroma subsampling
}
break;
case AV_CODEC_ID_HEVC :
if (strstr(info.vcodec.c_str(), "svt_hevc") != NULL) {
av_opt_set_int(c->priv_data, "preset", 7, 0);
av_opt_set_int(c->priv_data, "forced-idr",1,0);
av_opt_set_int(c->priv_data, "qp",std::min(std::stoi(value), 51),0);
}
else {
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value), 51), 0); // 0-51
}
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
av_opt_set_int(c->priv_data, "lossless", 1, 0);
}
break;
default:
// If this codec doesn't support crf calculate a bitrate
// TODO: find better formula
double mbs = 15000000.0;
if (info.video_bit_rate > 0) {
if (info.video_bit_rate > 42) {
mbs = 380000.0;
} else {
mbs *= std::pow(0.912, info.video_bit_rate);
}
}
c->bit_rate = (int) (mbs);
}
}
} else if (name == "qp") {
// encode quality and special settings like lossless
// This might be better in an extra methods as more options
// and way to set quality are possible
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
switch (c->codec_id) {
case AV_CODEC_ID_AV1 :
c->bit_rate = 0;
if (strstr(info.vcodec.c_str(), "svtav1") != NULL) {
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),63), 0);
}
else if (strstr(info.vcodec.c_str(), "rav1e") != NULL) {
// Set number of tiles to a fixed value
// TODO Let user choose number of tiles
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),255), 0);
}
else if (strstr(info.vcodec.c_str(), "aom") != NULL) {
// Set number of tiles to a fixed value
// TODO Let user choose number of tiles
// libaom doesn't have qp only crf
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value),63), 0);
}
else {
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value),63), 0);
}
case AV_CODEC_ID_HEVC :
c->bit_rate = 0;
if (strstr(info.vcodec.c_str(), "svt_hevc") != NULL) {
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),51), 0);
av_opt_set_int(c->priv_data, "preset", 7, 0);
av_opt_set_int(c->priv_data, "forced-idr",1,0);
}
break;
}
#endif // FFmpeg 4.0+
} else {
// Set AVOption
AV_OPTION_SET(st, c->priv_data, name.c_str(), value.c_str(), c);
}
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::SetOption (" + (std::string)name + ")",
"stream == VIDEO_STREAM", stream == VIDEO_STREAM);
// Muxing dictionary is not part of the codec context.
// Just reusing SetOption function to set popular multiplexing presets.
} else if (name == "muxing_preset") {
if (value == "mp4_faststart") {
// 'moov' box to the beginning; only for MOV, MP4
av_dict_set(&mux_dict, "movflags", "faststart", 0);
} else if (value == "mp4_fragmented") {
// write selfcontained fragmented file, minimum length of the fragment 8 sec; only for MOV, MP4
av_dict_set(&mux_dict, "movflags", "frag_keyframe", 0);
av_dict_set(&mux_dict, "min_frag_duration", "8000000", 0);
}
} else {
throw InvalidOptions("The option is not valid for this codec.", path);
}
}
bool FFmpegWriter::IsValidCodec(std::string codec_name) {
// Initialize FFMpeg, and register all formats and codecs
AV_REGISTER_ALL
// Find the codec (if any)
if (avcodec_find_encoder_by_name(codec_name.c_str()) == NULL)
return false;
else
return true;
}
// Prepare & initialize streams and open codecs
void FFmpegWriter::PrepareStreams() {
if (!info.has_audio && !info.has_video)
throw InvalidOptions("No video or audio options have been set. You must set has_video or has_audio (or both).", path);
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::PrepareStreams [" + path + "]",
"info.has_audio", info.has_audio,
"info.has_video", info.has_video);
// Initialize the streams (i.e. add the streams)
initialize_streams();
// Mark as 'prepared'
prepare_streams = true;
}
// Write the file header (after the options are set)
void FFmpegWriter::WriteHeader() {
if (!info.has_audio && !info.has_video)
throw InvalidOptions("No video or audio options have been set. You must set has_video or has_audio (or both).", path);
// Open the output file, if needed
if (!(oc->oformat->flags & AVFMT_NOFILE)) {
if (avio_open(&oc->pb, path.c_str(), AVIO_FLAG_WRITE) < 0)
throw InvalidFile("Could not open or write file.", path);
}
// Force the output filename (which doesn't always happen for some reason)
AV_SET_FILENAME(oc, path.c_str());
// Add general metadata (if any)
for (std::map<std::string, std::string>::iterator iter = info.metadata.begin(); iter != info.metadata.end(); ++iter) {
av_dict_set(&oc->metadata, iter->first.c_str(), iter->second.c_str(), 0);
}
// Set multiplexing parameters
AVDictionary *dict = NULL;
bool is_mp4 = strcmp(oc->oformat->name, "mp4");
bool is_mov = strcmp(oc->oformat->name, "mov");
// Set dictionary preset only for MP4 and MOV files
if (is_mp4 || is_mov)
av_dict_copy(&dict, mux_dict, 0);
// Write the stream header
if (avformat_write_header(oc, &dict) != 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::WriteHeader (avformat_write_header)");
throw InvalidFile("Could not write header to file.", path);
};
// Free multiplexing dictionaries sets
if (dict) av_dict_free(&dict);
if (mux_dict) av_dict_free(&mux_dict);
// Mark as 'written'
write_header = true;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteHeader");
}
// Add a frame to the queue waiting to be encoded.
void FFmpegWriter::WriteFrame(std::shared_ptr<openshot::Frame> frame) {
// Check for open reader (or throw exception)
if (!is_open)
throw WriterClosed("The FFmpegWriter is closed. Call Open() before calling this method.", path);
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::WriteFrame",
"frame->number", frame->number,
"is_writing", is_writing);
// Write frames to video file
write_frame(frame);
// Keep track of the last frame added
last_frame = frame;
}
// Write all frames in the queue to the video file.
void FFmpegWriter::write_frame(std::shared_ptr<Frame> frame) {
// Flip writing flag
is_writing = true;
// Create blank exception
bool has_error_encoding_video = false;
// Process audio frame
if (info.has_audio && audio_st)
write_audio_packets(false, frame);
// Process video frame
if (info.has_video && video_st)
process_video_packet(frame);
if (info.has_video && video_st) {
// Does this frame's AVFrame still exist
if (av_frames.count(frame)) {
// Get AVFrame
AVFrame *frame_final = av_frames[frame];
// Write frame to video file
if (!write_video_packet(frame, frame_final)) {
has_error_encoding_video = true;
}
// Deallocate buffer and AVFrame
av_freep(&(frame_final->data[0]));
AV_FREE_FRAME(&frame_final);
av_frames.erase(frame);
}
}
// Done writing
is_writing = false;
// Raise exception from main thread
if (has_error_encoding_video)
throw ErrorEncodingVideo("Error while writing raw video frame", -1);
}
// Write a block of frames from a reader
void FFmpegWriter::WriteFrame(ReaderBase *reader, int64_t start, int64_t length) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::WriteFrame (from Reader)",
"start", start,
"length", length);
// Loop through each frame (and encoded it)
for (int64_t number = start; number <= length; number++) {
// Get the frame
std::shared_ptr<Frame> f = reader->GetFrame(number);
// Encode frame
WriteFrame(f);
}
}
// Write the file trailer (after all frames are written)
void FFmpegWriter::WriteTrailer() {
// Process final audio frame (if any)
if (info.has_audio && audio_st)
write_audio_packets(true, NULL);
// Flush encoders (who sometimes hold on to frames)
flush_encoders();
/* write the trailer, if any. The trailer must be written
* before you close the CodecContexts open when you wrote the
* header; otherwise write_trailer may try to use memory that
* was freed on av_codec_close() */
av_write_trailer(oc);
// Mark as 'written'
write_trailer = true;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteTrailer");
}
// Flush encoders
void FFmpegWriter::flush_encoders() {
if (info.has_audio && audio_codec_ctx && AV_GET_CODEC_TYPE(audio_st) == AVMEDIA_TYPE_AUDIO && AV_GET_CODEC_ATTRIBUTES(audio_st, audio_codec_ctx)->frame_size <= 1)
return;
#if (LIBAVFORMAT_VERSION_MAJOR < 58)
// FFmpeg < 4.0
if (info.has_video && video_codec_ctx && AV_GET_CODEC_TYPE(video_st) == AVMEDIA_TYPE_VIDEO && (oc->oformat->flags & AVFMT_RAWPICTURE) && AV_FIND_DECODER_CODEC_ID(video_st) == AV_CODEC_ID_RAWVIDEO)
return;
#else
if (info.has_video && video_codec_ctx && AV_GET_CODEC_TYPE(video_st) == AVMEDIA_TYPE_VIDEO && AV_FIND_DECODER_CODEC_ID(video_st) == AV_CODEC_ID_RAWVIDEO)
return;
#endif
// FLUSH VIDEO ENCODER
if (info.has_video) {
for (;;) {
// Increment PTS (in frames and scaled to the codec's timebase)
video_timestamp += av_rescale_q(1, av_make_q(info.fps.den, info.fps.num), video_codec_ctx->time_base);
#if IS_FFMPEG_3_2
AVPacket* pkt = av_packet_alloc();
#else
AVPacket* pkt;
av_init_packet(pkt);
#endif
pkt->data = NULL;
pkt->size = 0;
/* encode the image */
int got_packet = 0;
int error_code = 0;
#if IS_FFMPEG_3_2
// Encode video packet (latest version of FFmpeg)
error_code = avcodec_send_frame(video_codec_ctx, NULL);
got_packet = 0;
while (error_code >= 0) {
error_code = avcodec_receive_packet(video_codec_ctx, pkt);
if (error_code == AVERROR(EAGAIN)|| error_code == AVERROR_EOF) {
got_packet = 0;
// Write packet
avcodec_flush_buffers(video_codec_ctx);
break;
}
av_packet_rescale_ts(pkt, video_codec_ctx->time_base, video_st->time_base);
pkt->stream_index = video_st->index;
error_code = av_interleaved_write_frame(oc, pkt);
}
#else // IS_FFMPEG_3_2
// Encode video packet (older than FFmpeg 3.2)
error_code = avcodec_encode_video2(video_codec_ctx, pkt, NULL, &got_packet);
#endif // IS_FFMPEG_3_2
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::flush_encoders ERROR ["
+ av_err2string(error_code) + "]",
"error_code", error_code);
}
if (!got_packet) {
break;
}
// set the timestamp
av_packet_rescale_ts(pkt, video_codec_ctx->time_base, video_st->time_base);
pkt->stream_index = video_st->index;
// Write packet
error_code = av_interleaved_write_frame(oc, pkt);
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::flush_encoders ERROR ["
+ av_err2string(error_code) + "]",
"error_code", error_code);
}
}
}
// FLUSH AUDIO ENCODER
if (info.has_audio) {
for (;;) {
#if IS_FFMPEG_3_2
AVPacket* pkt = av_packet_alloc();
#else
AVPacket* pkt;
av_init_packet(pkt);
#endif
pkt->data = NULL;
pkt->size = 0;
pkt->pts = pkt->dts = audio_timestamp;
/* encode the image */
int error_code = 0;
int got_packet = 0;
#if IS_FFMPEG_3_2
error_code = avcodec_send_frame(audio_codec_ctx, NULL);
#else
error_code = avcodec_encode_audio2(audio_codec_ctx, pkt, NULL, &got_packet);
#endif
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::flush_encoders ERROR ["
+ av_err2string(error_code) + "]",
"error_code", error_code);
}
if (!got_packet) {
break;
}
// Since the PTS can change during encoding, set the value again. This seems like a huge hack,
// but it fixes lots of PTS related issues when I do this.
pkt->pts = pkt->dts = audio_timestamp;
// Scale the PTS to the audio stream timebase (which is sometimes different than the codec's timebase)
av_packet_rescale_ts(pkt, audio_codec_ctx->time_base, audio_st->time_base);
// set stream
pkt->stream_index = audio_st->index;
pkt->flags |= AV_PKT_FLAG_KEY;
// Write packet
error_code = av_interleaved_write_frame(oc, pkt);
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::flush_encoders ERROR ["
+ av_err2string(error_code) + "]",
"error_code", error_code);
}
// Increment PTS by duration of packet
audio_timestamp += pkt->duration;
// deallocate memory for packet
AV_FREE_PACKET(pkt);
}
}
}
// Close the video codec
void FFmpegWriter::close_video(AVFormatContext *oc, AVStream *st)
{
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
if (hw_device_ctx) {
av_buffer_unref(&hw_device_ctx);
hw_device_ctx = NULL;
}
}
#endif // USE_HW_ACCEL
// Free any previous memory allocations
if (video_codec_ctx != nullptr) {
AV_FREE_CONTEXT(video_codec_ctx);
av_free(video_codec_ctx);
}
}
// Close the audio codec
void FFmpegWriter::close_audio(AVFormatContext *oc, AVStream *st)
{
// Clear buffers
delete[] samples;
delete[] audio_outbuf;
delete[] audio_encoder_buffer;
samples = NULL;
audio_outbuf = NULL;
audio_encoder_buffer = NULL;
// Deallocate resample buffer
if (avr) {
SWR_CLOSE(avr);
SWR_FREE(&avr);
avr = NULL;
}
if (avr_planar) {
SWR_CLOSE(avr_planar);
SWR_FREE(&avr_planar);
avr_planar = NULL;
}
// Free any previous memory allocations
if (audio_codec_ctx != nullptr) {
AV_FREE_CONTEXT(audio_codec_ctx);
av_free(audio_codec_ctx);
}
}
// Close the writer
void FFmpegWriter::Close() {
// Write trailer (if needed)
if (!write_trailer)
WriteTrailer();
// Close each codec
if (video_st)
close_video(oc, video_st);
if (audio_st)
close_audio(oc, audio_st);
// Deallocate image scalers
if (image_rescalers.size() > 0)
RemoveScalers();
if (!(oc->oformat->flags & AVFMT_NOFILE)) {
/* close the output file */
avio_close(oc->pb);
}
// Reset frame counters
video_timestamp = 0;
audio_timestamp = 0;
// Free the context which frees the streams too
avformat_free_context(oc);
oc = NULL;
// Close writer
is_open = false;
prepare_streams = false;
write_header = false;
write_trailer = false;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::Close");
}
// Add an AVFrame to the cache
void FFmpegWriter::add_avframe(std::shared_ptr<Frame> frame, AVFrame *av_frame) {
// Add AVFrame to map (if it does not already exist)
if (!av_frames.count(frame)) {
// Add av_frame
av_frames[frame] = av_frame;
} else {
// Do not add, and deallocate this AVFrame
AV_FREE_FRAME(&av_frame);
}
}
// Add an audio output stream
AVStream *FFmpegWriter::add_audio_stream() {
// Find the audio codec
const AVCodec *codec = avcodec_find_encoder_by_name(info.acodec.c_str());
if (codec == NULL)
throw InvalidCodec("A valid audio codec could not be found for this file.", path);
// Free any previous memory allocations
if (audio_codec_ctx != nullptr) {
AV_FREE_CONTEXT(audio_codec_ctx);
}
// Create a new audio stream
AVStream* st = avformat_new_stream(oc, codec);
if (!st)
throw OutOfMemory("Could not allocate memory for the video stream.", path);
// Allocate a new codec context for the stream
ALLOC_CODEC_CTX(audio_codec_ctx, codec, st)
#if (LIBAVFORMAT_VERSION_MAJOR >= 58)
st->codecpar->codec_id = codec->id;
#endif
AVCodecContext* c = audio_codec_ctx;
c->codec_id = codec->id;
c->codec_type = AVMEDIA_TYPE_AUDIO;
// Set the sample parameters
c->bit_rate = info.audio_bit_rate;
#if !HAVE_CH_LAYOUT
c->channels = info.channels;
#endif
// Set valid sample rate (or throw error)
if (codec->supported_samplerates) {
int i;
for (i = 0; codec->supported_samplerates[i] != 0; i++)
if (info.sample_rate == codec->supported_samplerates[i]) {
// Set the valid sample rate
c->sample_rate = info.sample_rate;
break;
}
if (codec->supported_samplerates[i] == 0)
throw InvalidSampleRate("An invalid sample rate was detected for this codec.", path);
} else
// Set sample rate
c->sample_rate = info.sample_rate;
uint64_t channel_layout = info.channel_layout;
#if HAVE_CH_LAYOUT
// Set a valid number of channels (or throw error)
AVChannelLayout ch_layout;
av_channel_layout_from_mask(&ch_layout, info.channel_layout);
if (codec->ch_layouts) {
int i;
for (i = 0; av_channel_layout_check(&codec->ch_layouts[i]); i++)
if (av_channel_layout_compare(&ch_layout, &codec->ch_layouts[i])) {
// Set valid channel layout
av_channel_layout_copy(&c->ch_layout, &ch_layout);
break;
}
if (!av_channel_layout_check(&codec->ch_layouts[i]))
throw InvalidChannels("An invalid channel layout was detected (i.e. MONO / STEREO).", path);
} else
// Set valid channel layout
av_channel_layout_copy(&c->ch_layout, &ch_layout);
#else
// Set a valid number of channels (or throw error)
if (codec->channel_layouts) {
int i;
for (i = 0; codec->channel_layouts[i] != 0; i++)
if (channel_layout == codec->channel_layouts[i]) {
// Set valid channel layout
c->channel_layout = channel_layout;
break;
}
if (codec->channel_layouts[i] == 0)
throw InvalidChannels("An invalid channel layout was detected (i.e. MONO / STEREO).", path);
} else
// Set valid channel layout
c->channel_layout = channel_layout;
#endif
// Choose a valid sample_fmt
if (codec->sample_fmts) {
for (int i = 0; codec->sample_fmts[i] != AV_SAMPLE_FMT_NONE; i++) {
// Set sample format to 1st valid format (and then exit loop)
c->sample_fmt = codec->sample_fmts[i];
break;
}
}
if (c->sample_fmt == AV_SAMPLE_FMT_NONE) {
// Default if no sample formats found
c->sample_fmt = AV_SAMPLE_FMT_S16;
}
// some formats want stream headers to be separate
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
#if (LIBAVCODEC_VERSION_MAJOR >= 57)
// FFmpeg 3.0+
c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
#else
c->flags |= CODEC_FLAG_GLOBAL_HEADER;
#endif
AV_COPY_PARAMS_FROM_CONTEXT(st, c);
int nb_channels;
const char* nb_channels_label;
const char* channel_layout_label;
#if HAVE_CH_LAYOUT
nb_channels = c->ch_layout.nb_channels;
channel_layout = c->ch_layout.u.mask;
nb_channels_label = "c->ch_layout.nb_channels";
channel_layout_label = "c->ch_layout.u.mask";
#else
nb_channels = c->channels;
nb_channels_label = "c->channels";
channel_layout_label = "c->channel_layout";
#endif
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::add_audio_stream",
"c->codec_id", c->codec_id,
"c->bit_rate", c->bit_rate,
nb_channels_label, nb_channels,
"c->sample_fmt", c->sample_fmt,
channel_layout_label, channel_layout,
"c->sample_rate", c->sample_rate);
return st;
}
// Add a video output stream
AVStream *FFmpegWriter::add_video_stream() {
// Find the video codec
const AVCodec *codec = avcodec_find_encoder_by_name(info.vcodec.c_str());
if (codec == NULL)
throw InvalidCodec("A valid video codec could not be found for this file.", path);
// Free any previous memory allocations
if (video_codec_ctx != nullptr) {
AV_FREE_CONTEXT(video_codec_ctx);
}
// Create a new video stream
AVStream* st = avformat_new_stream(oc, codec);
if (!st)
throw OutOfMemory("Could not allocate memory for the video stream.", path);
// Allocate a new codec context for the stream
ALLOC_CODEC_CTX(video_codec_ctx, codec, st)
#if (LIBAVFORMAT_VERSION_MAJOR >= 58)
st->codecpar->codec_id = codec->id;
#endif
AVCodecContext* c = video_codec_ctx;
c->codec_id = codec->id;
c->codec_type = AVMEDIA_TYPE_VIDEO;
// Set sample aspect ratio
c->sample_aspect_ratio.num = info.pixel_ratio.num;
c->sample_aspect_ratio.den = info.pixel_ratio.den;
/* Init video encoder options */
if (info.video_bit_rate >= 1000
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
&& c->codec_id != AV_CODEC_ID_AV1
#endif
) {
c->bit_rate = info.video_bit_rate;
if (info.video_bit_rate >= 1500000) {
if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
c->qmin = 2;
c->qmax = 30;
}
}
// Here should be the setting for low fixed bitrate
// Defaults are used because mpeg2 otherwise had problems
} else {
// Check if codec supports crf or qp
switch (c->codec_id) {
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
case AV_CODEC_ID_AV1 :
// TODO: Set `crf` or `qp` according to bitrate, as bitrate is not supported by these encoders yet.
if (info.video_bit_rate >= 1000) {
c->bit_rate = 0;
if (strstr(info.vcodec.c_str(), "aom") != NULL) {
int calculated_quality = 35;
if (info.video_bit_rate < 500000) calculated_quality = 50;
if (info.video_bit_rate > 5000000) calculated_quality = 10;
av_opt_set_int(c->priv_data, "crf", calculated_quality, 0);
info.video_bit_rate = calculated_quality;
} else {
int calculated_quality = 50;
if (info.video_bit_rate < 500000) calculated_quality = 60;
if (info.video_bit_rate > 5000000) calculated_quality = 15;
av_opt_set_int(c->priv_data, "qp", calculated_quality, 0);
info.video_bit_rate = calculated_quality;
} // medium
}
if (strstr(info.vcodec.c_str(), "svtav1") != NULL) {
av_opt_set_int(c->priv_data, "preset", 6, 0);
av_opt_set_int(c->priv_data, "forced-idr",1,0);
}
else if (strstr(info.vcodec.c_str(), "rav1e") != NULL) {
av_opt_set_int(c->priv_data, "speed", 7, 0);
av_opt_set_int(c->priv_data, "tile-rows", 2, 0);
av_opt_set_int(c->priv_data, "tile-columns", 4, 0);
}
else if (strstr(info.vcodec.c_str(), "aom") != NULL) {
// Set number of tiles to a fixed value
// TODO: Allow user to chose their own number of tiles
av_opt_set_int(c->priv_data, "tile-rows", 1, 0); // log2 of number of rows
av_opt_set_int(c->priv_data, "tile-columns", 2, 0); // log2 of number of columns
av_opt_set_int(c->priv_data, "row-mt", 1, 0); // use multiple cores
av_opt_set_int(c->priv_data, "cpu-used", 3, 0); // default is 1, usable is 4
}
//break;
#endif
case AV_CODEC_ID_VP9 :
case AV_CODEC_ID_HEVC :
case AV_CODEC_ID_VP8 :
case AV_CODEC_ID_H264 :
if (info.video_bit_rate < 40) {
c->qmin = 0;
c->qmax = 63;
} else {
c->qmin = info.video_bit_rate - 5;
c->qmax = 63;
}
break;
default:
// Here should be the setting for codecs that don't support crf
// For now defaults are used
break;
}
}
//TODO: Implement variable bitrate feature (which actually works). This implementation throws
//invalid bitrate errors and rc buffer underflow errors, etc...
//c->rc_min_rate = info.video_bit_rate;
//c->rc_max_rate = info.video_bit_rate;
//c->rc_buffer_size = FFMAX(c->rc_max_rate, 15000000) * 112L / 15000000 * 16384;
//if ( !c->rc_initial_buffer_occupancy )
// c->rc_initial_buffer_occupancy = c->rc_buffer_size * 3/4;
/* resolution must be a multiple of two */
// TODO: require /2 height and width
c->width = info.width;
c->height = info.height;
/* time base: this is the fundamental unit of time (in seconds) in terms
of which frame timestamps are represented. for fixed-fps content,
timebase should be 1/framerate and timestamp increments should be
identically 1. */
c->time_base.num = info.video_timebase.num;
c->time_base.den = info.video_timebase.den;
// AVCodecContext->framerate was added in FFmpeg 2.6
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(56, 26, 0)
c->framerate = av_inv_q(c->time_base);
#endif
st->avg_frame_rate = av_inv_q(c->time_base);
st->time_base.num = info.video_timebase.num;
st->time_base.den = info.video_timebase.den;
c->gop_size = 12; /* TODO: add this to "info"... emit one intra frame every twelve frames at most */
c->max_b_frames = 10;
if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO)
/* just for testing, we also add B frames */
c->max_b_frames = 2;
if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO)
/* Needed to avoid using macroblocks in which some coeffs overflow.
This does not happen with normal video, it just happens here as
the motion of the chroma plane does not match the luma plane. */
c->mb_decision = 2;
// some formats want stream headers to be separate
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
#if (LIBAVCODEC_VERSION_MAJOR >= 57)
// FFmpeg 3.0+
c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
#else
c->flags |= CODEC_FLAG_GLOBAL_HEADER;
#endif
// Find all supported pixel formats for this codec
const PixelFormat *supported_pixel_formats = codec->pix_fmts;
while (supported_pixel_formats != NULL && *supported_pixel_formats != PIX_FMT_NONE) {
// Assign the 1st valid pixel format (if one is missing)
if (c->pix_fmt == PIX_FMT_NONE)
c->pix_fmt = *supported_pixel_formats;
++supported_pixel_formats;
}
// Codec doesn't have any pix formats?
if (c->pix_fmt == PIX_FMT_NONE) {
if (oc->oformat->video_codec == AV_CODEC_ID_RAWVIDEO) {
// Raw video should use RGB24
c->pix_fmt = PIX_FMT_RGB24;
#if (LIBAVFORMAT_VERSION_MAJOR < 58)
// FFmpeg < 4.0
if (strcmp(oc->oformat->name, "gif") != 0)
// If not GIF format, skip the encoding process
// Set raw picture flag (so we don't encode this video)
oc->oformat->flags |= AVFMT_RAWPICTURE;
#endif
} else {
// Set the default codec
c->pix_fmt = PIX_FMT_YUV420P;
}
}
AV_COPY_PARAMS_FROM_CONTEXT(st, c);
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::add_video_stream ("
+ (std::string)oc->oformat->name + " : "
+ (std::string)av_get_pix_fmt_name(c->pix_fmt) + ")",
"c->codec_id", c->codec_id,
"c->bit_rate", c->bit_rate,
"c->pix_fmt", c->pix_fmt,
"oc->oformat->flags", oc->oformat->flags);
return st;
}
// open audio codec
void FFmpegWriter::open_audio(AVFormatContext *oc, AVStream *st) {
const AVCodec *codec;
AV_GET_CODEC_FROM_STREAM(st, audio_codec_ctx)
// Set number of threads equal to number of processors (not to exceed 16)
audio_codec_ctx->thread_count = std::min(FF_NUM_PROCESSORS, 16);
// Find the audio encoder
codec = avcodec_find_encoder_by_name(info.acodec.c_str());
if (!codec)
codec = avcodec_find_encoder(audio_codec_ctx->codec_id);
if (!codec)
throw InvalidCodec("Could not find codec", path);
// Init options
AVDictionary *opts = NULL;
av_dict_set(&opts, "strict", "experimental", 0);
// Open the codec
if (avcodec_open2(audio_codec_ctx, codec, &opts) < 0)
throw InvalidCodec("Could not open audio codec", path);
AV_COPY_PARAMS_FROM_CONTEXT(st, audio_codec_ctx);
// Free options
av_dict_free(&opts);
// Calculate the size of the input frame (i..e how many samples per packet), and the output buffer
// TODO: Ugly hack for PCM codecs (will be removed ASAP with new PCM support to compute the input frame size in samples
if (audio_codec_ctx->frame_size <= 1) {
// No frame size found... so calculate
audio_input_frame_size = 50000 / info.channels;
int s = AV_FIND_DECODER_CODEC_ID(st);
switch (s) {
case AV_CODEC_ID_PCM_S16LE:
case AV_CODEC_ID_PCM_S16BE:
case AV_CODEC_ID_PCM_U16LE:
case AV_CODEC_ID_PCM_U16BE:
audio_input_frame_size >>= 1;
break;
default:
break;
}
} else {
// Set frame size based on the codec
audio_input_frame_size = audio_codec_ctx->frame_size;
}
// Set the initial frame size (since it might change during resampling)
initial_audio_input_frame_size = audio_input_frame_size;
// Allocate array for samples
samples = new int16_t[AVCODEC_MAX_AUDIO_FRAME_SIZE];
// Set audio output buffer (used to store the encoded audio)
audio_outbuf_size = AVCODEC_MAX_AUDIO_FRAME_SIZE;
audio_outbuf = new uint8_t[audio_outbuf_size];
// Set audio packet encoding buffer
audio_encoder_buffer_size = AUDIO_PACKET_ENCODING_SIZE;
audio_encoder_buffer = new uint8_t[audio_encoder_buffer_size];
// Add audio metadata (if any)
for (std::map<std::string, std::string>::iterator iter = info.metadata.begin(); iter != info.metadata.end(); ++iter) {
av_dict_set(&st->metadata, iter->first.c_str(), iter->second.c_str(), 0);
}
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::open_audio",
"audio_codec_ctx->thread_count", audio_codec_ctx->thread_count,
"audio_input_frame_size", audio_input_frame_size,
"buffer_size", AVCODEC_MAX_AUDIO_FRAME_SIZE + MY_INPUT_BUFFER_PADDING_SIZE);
}
// open video codec
void FFmpegWriter::open_video(AVFormatContext *oc, AVStream *st) {
const AVCodec *codec;
AV_GET_CODEC_FROM_STREAM(st, video_codec_ctx)
// Set number of threads equal to number of processors (not to exceed 16)
video_codec_ctx->thread_count = std::min(FF_NUM_PROCESSORS, 16);
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
//char *dev_hw = NULL;
char adapter[256];
char *adapter_ptr = NULL;
int adapter_num;
// Use the hw device given in the environment variable HW_EN_DEVICE_SET or the default if not set
adapter_num = openshot::Settings::Instance()->HW_EN_DEVICE_SET;
std::clog << "Encoding Device Nr: " << adapter_num << "\n";
if (adapter_num < 3 && adapter_num >=0) {
#if defined(__linux__)
snprintf(adapter,sizeof(adapter),"/dev/dri/renderD%d", adapter_num+128);
// Maybe 127 is better because the first card would be 1?!
adapter_ptr = adapter;
#elif defined(_WIN32) || defined(__APPLE__)
adapter_ptr = NULL;
#endif
}
else {
adapter_ptr = NULL; // Just to be sure
}
// Check if it is there and writable
#if defined(__linux__)
if( adapter_ptr != NULL && access( adapter_ptr, W_OK ) == 0 ) {
#elif defined(_WIN32) || defined(__APPLE__)
if( adapter_ptr != NULL ) {
#endif
ZmqLogger::Instance()->AppendDebugMethod(
"Encode Device present using device",
"adapter", adapter_num);
}
else {
adapter_ptr = NULL; // use default
ZmqLogger::Instance()->AppendDebugMethod(
"Encode Device not present, using default");
}
if (av_hwdevice_ctx_create(&hw_device_ctx,
hw_en_av_device_type, adapter_ptr, NULL, 0) < 0)
{
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::open_video ERROR creating hwdevice, Codec name:",
info.vcodec.c_str(), -1);
throw InvalidCodec("Could not create hwdevice", path);
}
}
#endif // USE_HW_ACCEL
/* find the video encoder */
codec = avcodec_find_encoder_by_name(info.vcodec.c_str());
if (!codec)
codec = avcodec_find_encoder(AV_FIND_DECODER_CODEC_ID(st));
if (!codec)
throw InvalidCodec("Could not find codec", path);
/* Force max_b_frames to 0 in some cases (i.e. for mjpeg image sequences */
if (video_codec_ctx->max_b_frames && video_codec_ctx->codec_id != AV_CODEC_ID_MPEG4 && video_codec_ctx->codec_id != AV_CODEC_ID_MPEG1VIDEO && video_codec_ctx->codec_id != AV_CODEC_ID_MPEG2VIDEO)
video_codec_ctx->max_b_frames = 0;
// Init options
AVDictionary *opts = NULL;
av_dict_set(&opts, "strict", "experimental", 0);
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
video_codec_ctx->pix_fmt = hw_en_av_pix_fmt;
// for the list of possible options, see the list of codec-specific options:
// e.g. ffmpeg -h encoder=h264_vaapi or ffmpeg -h encoder=hevc_vaapi
// and "man ffmpeg-codecs"
// For VAAPI, it is safer to explicitly set rc_mode instead of relying on auto-selection
// which is ffmpeg version-specific.
if (hw_en_av_pix_fmt == AV_PIX_FMT_VAAPI) {
int64_t qp;
if (av_opt_get_int(video_codec_ctx->priv_data, "qp", 0, &qp) != 0 || qp == 0) {
// unless "qp" was set for CQP, switch to VBR RC mode
av_opt_set(video_codec_ctx->priv_data, "rc_mode", "VBR", 0);
// In the current state (ffmpeg-4.2-4 libva-mesa-driver-19.1.5-1) to use VBR,
// one has to specify both bit_rate and maxrate, otherwise a small low quality file is generated on Intel iGPU).
video_codec_ctx->rc_max_rate = video_codec_ctx->bit_rate;
}
}
switch (video_codec_ctx->codec_id) {
case AV_CODEC_ID_H264:
video_codec_ctx->max_b_frames = 0; // At least this GPU doesn't support b-frames
video_codec_ctx->profile = FF_PROFILE_H264_BASELINE | FF_PROFILE_H264_CONSTRAINED;
av_opt_set(video_codec_ctx->priv_data, "preset", "slow", 0);
av_opt_set(video_codec_ctx->priv_data, "tune", "zerolatency", 0);
av_opt_set(video_codec_ctx->priv_data, "vprofile", "baseline", AV_OPT_SEARCH_CHILDREN);
break;
case AV_CODEC_ID_HEVC:
// tested to work with defaults
break;
case AV_CODEC_ID_VP9:
// tested to work with defaults
break;
default:
ZmqLogger::Instance()->AppendDebugMethod(
"No codec-specific options defined for this codec. HW encoding may fail",
"codec_id", video_codec_ctx->codec_id);
break;
}
// set hw_frames_ctx for encoder's AVCodecContext
int err;
if ((err = set_hwframe_ctx(video_codec_ctx, hw_device_ctx, info.width, info.height)) < 0)
{
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::open_video (set_hwframe_ctx) ERROR faled to set hwframe context",
"width", info.width,
"height", info.height,
av_err2string(err), -1);
}
}
#endif // USE_HW_ACCEL
/* open the codec */
if (avcodec_open2(video_codec_ctx, codec, &opts) < 0)
throw InvalidCodec("Could not open video codec", path);
AV_COPY_PARAMS_FROM_CONTEXT(st, video_codec_ctx);
// Free options
av_dict_free(&opts);
// Add video metadata (if any)
for (std::map<std::string, std::string>::iterator iter = info.metadata.begin(); iter != info.metadata.end(); ++iter) {
av_dict_set(&st->metadata, iter->first.c_str(), iter->second.c_str(), 0);
}
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::open_video",
"video_codec_ctx->thread_count", video_codec_ctx->thread_count);
}
// write all queued frames' audio to the video file
void FFmpegWriter::write_audio_packets(bool is_final, std::shared_ptr<openshot::Frame> frame) {
if (!frame && !is_final)
return;
// Init audio buffers / variables
int total_frame_samples = 0;
int frame_position = 0;
int channels_in_frame = 0;
int sample_rate_in_frame = 0;
int samples_in_frame = 0;
ChannelLayout channel_layout_in_frame = LAYOUT_MONO; // default channel layout
// Create a new array (to hold all S16 audio samples, for the current queued frames
unsigned int all_queued_samples_size = sizeof(int16_t) * AVCODEC_MAX_AUDIO_FRAME_SIZE;
int16_t *all_queued_samples = (int16_t *) av_malloc(all_queued_samples_size);
int16_t *all_resampled_samples = NULL;
int16_t *final_samples_planar = NULL;
int16_t *final_samples = NULL;
// Get audio sample array
float *frame_samples_float = NULL;
// Get the audio details from this frame
if (frame) {
sample_rate_in_frame = frame->SampleRate();
samples_in_frame = frame->GetAudioSamplesCount();
channels_in_frame = frame->GetAudioChannelsCount();
channel_layout_in_frame = frame->ChannelsLayout();
// Get samples interleaved together (c1 c2 c1 c2 c1 c2)
frame_samples_float = frame->GetInterleavedAudioSamples(&samples_in_frame);
}
// Calculate total samples
total_frame_samples = samples_in_frame * channels_in_frame;
// Translate audio sample values back to 16 bit integers with saturation
const int16_t max16 = 32767;
const int16_t min16 = -32768;
for (int s = 0; s < total_frame_samples; s++, frame_position++) {
float valF = frame_samples_float[s] * (1 << 15);
int16_t conv;
if (valF > max16) {
conv = max16;
} else if (valF < min16) {
conv = min16;
} else {
conv = int(valF + 32768.5) - 32768; // +0.5 is for rounding
}
// Copy into buffer
all_queued_samples[frame_position] = conv;
}
// Deallocate float array
delete[] frame_samples_float;
// Update total samples (since we've combined all queued frames)
total_frame_samples = frame_position;
int remaining_frame_samples = total_frame_samples;
int samples_position = 0;
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_audio_packets",
"is_final", is_final,
"total_frame_samples", total_frame_samples,
"channel_layout_in_frame", channel_layout_in_frame,
"channels_in_frame", channels_in_frame,
"samples_in_frame", samples_in_frame,
"LAYOUT_MONO", LAYOUT_MONO);
// Keep track of the original sample format
AVSampleFormat output_sample_fmt = audio_codec_ctx->sample_fmt;
AVFrame *audio_frame = NULL;
if (!is_final) {
// Create input frame (and allocate arrays)
audio_frame = AV_ALLOCATE_FRAME();
AV_RESET_FRAME(audio_frame);
audio_frame->nb_samples = total_frame_samples / channels_in_frame;
// Fill input frame with sample data
int error_code = avcodec_fill_audio_frame(audio_frame, channels_in_frame, AV_SAMPLE_FMT_S16, (uint8_t *) all_queued_samples, all_queued_samples_size, 0);
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_audio_packets ERROR ["
+ av_err2string(error_code) + "]",
"error_code", error_code);
}
// Do not convert audio to planar format (yet). We need to keep everything interleaved at this point.
switch (audio_codec_ctx->sample_fmt) {
case AV_SAMPLE_FMT_FLTP: {
output_sample_fmt = AV_SAMPLE_FMT_FLT;
break;
}
case AV_SAMPLE_FMT_S32P: {
output_sample_fmt = AV_SAMPLE_FMT_S32;
break;
}
case AV_SAMPLE_FMT_S16P: {
output_sample_fmt = AV_SAMPLE_FMT_S16;
break;
}
case AV_SAMPLE_FMT_U8P: {
output_sample_fmt = AV_SAMPLE_FMT_U8;
break;
}
default: {
// This is only here to silence unused-enum warnings
break;
}
}
// Update total samples & input frame size (due to bigger or smaller data types)
total_frame_samples *= (float(info.sample_rate) / sample_rate_in_frame); // adjust for different byte sizes
total_frame_samples *= (float(info.channels) / channels_in_frame); // adjust for different # of channels
// Create output frame (and allocate arrays)
AVFrame *audio_converted = AV_ALLOCATE_FRAME();
AV_RESET_FRAME(audio_converted);
audio_converted->nb_samples = total_frame_samples / channels_in_frame;
av_samples_alloc(audio_converted->data, audio_converted->linesize, info.channels, audio_converted->nb_samples, output_sample_fmt, 0);
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_audio_packets (1st resampling)",
"in_sample_fmt", AV_SAMPLE_FMT_S16,
"out_sample_fmt", output_sample_fmt,
"in_sample_rate", sample_rate_in_frame,
"out_sample_rate", info.sample_rate,
"in_channels", channels_in_frame,
"out_channels", info.channels);
// setup resample context
if (!avr) {
avr = SWR_ALLOC();
#if HAVE_CH_LAYOUT
AVChannelLayout in_chlayout;
AVChannelLayout out_chlayout;
av_channel_layout_from_mask(&in_chlayout, channel_layout_in_frame);
av_channel_layout_from_mask(&out_chlayout, info.channel_layout);
av_opt_set_chlayout(avr, "in_chlayout", &in_chlayout, 0);
av_opt_set_chlayout(avr, "out_chlayout", &out_chlayout, 0);
#else
av_opt_set_int(avr, "in_channel_layout", channel_layout_in_frame, 0);
av_opt_set_int(avr, "out_channel_layout", info.channel_layout, 0);
av_opt_set_int(avr, "in_channels", channels_in_frame, 0);
av_opt_set_int(avr, "out_channels", info.channels, 0);
#endif
av_opt_set_int(avr, "in_sample_fmt", AV_SAMPLE_FMT_S16, 0);
av_opt_set_int(avr, "out_sample_fmt", output_sample_fmt, 0); // planar not allowed here
av_opt_set_int(avr, "in_sample_rate", sample_rate_in_frame, 0);
av_opt_set_int(avr, "out_sample_rate", info.sample_rate, 0);
SWR_INIT(avr);
}
// Convert audio samples
int nb_samples = SWR_CONVERT(
avr, // audio resample context
audio_converted->data, // output data pointers
audio_converted->linesize[0], // output plane size, in bytes. (0 if unknown)
audio_converted->nb_samples, // maximum number of samples that the output buffer can hold
audio_frame->data, // input data pointers
audio_frame->linesize[0], // input plane size, in bytes (0 if unknown)
audio_frame->nb_samples // number of input samples to convert
);
// Set remaining samples
remaining_frame_samples = total_frame_samples;
// Create a new array (to hold all resampled S16 audio samples)
all_resampled_samples = (int16_t *) av_malloc(
sizeof(int16_t) * nb_samples * info.channels
* (av_get_bytes_per_sample(output_sample_fmt) /
av_get_bytes_per_sample(AV_SAMPLE_FMT_S16) )
);
// Copy audio samples over original samples
memcpy(all_resampled_samples, audio_converted->data[0],
static_cast<size_t>(nb_samples)
* info.channels
* av_get_bytes_per_sample(output_sample_fmt));
// Remove converted audio
av_freep(&(audio_frame->data[0]));
AV_FREE_FRAME(&audio_frame);
av_freep(&audio_converted->data[0]);
AV_FREE_FRAME(&audio_converted);
all_queued_samples = NULL; // this array cleared with above call
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_audio_packets (Successfully completed 1st resampling)",
"nb_samples", nb_samples,
"remaining_frame_samples", remaining_frame_samples);
}
// Loop until no more samples
while (remaining_frame_samples > 0 || is_final) {
// Get remaining samples needed for this packet
int remaining_packet_samples = (audio_input_frame_size * info.channels) - audio_input_position;
// Determine how many samples we need
int diff = 0;
if (remaining_frame_samples >= remaining_packet_samples) {
diff = remaining_packet_samples;
} else {
diff = remaining_frame_samples;
}
// Copy frame samples into the packet samples array
if (!is_final)
//TODO: Make this more sane
memcpy(
samples + (audio_input_position
* (av_get_bytes_per_sample(output_sample_fmt) /
av_get_bytes_per_sample(AV_SAMPLE_FMT_S16) )
),
all_resampled_samples + samples_position,
static_cast<size_t>(diff)
* av_get_bytes_per_sample(output_sample_fmt)
);
// Increment counters
audio_input_position += diff;
samples_position += diff * (av_get_bytes_per_sample(output_sample_fmt) / av_get_bytes_per_sample(AV_SAMPLE_FMT_S16));
remaining_frame_samples -= diff;
// Do we have enough samples to proceed?
if (audio_input_position < (audio_input_frame_size * info.channels) && !is_final)
// Not enough samples to encode... so wait until the next frame
break;
// Convert to planar (if needed by audio codec)
AVFrame *frame_final = AV_ALLOCATE_FRAME();
AV_RESET_FRAME(frame_final);
if (av_sample_fmt_is_planar(audio_codec_ctx->sample_fmt)) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_audio_packets (2nd resampling for Planar formats)",
"in_sample_fmt", output_sample_fmt,
"out_sample_fmt", audio_codec_ctx->sample_fmt,
"in_sample_rate", info.sample_rate,
"out_sample_rate", info.sample_rate,
"in_channels", info.channels,
"out_channels", info.channels
);
// setup resample context
if (!avr_planar) {
avr_planar = SWR_ALLOC();
#if HAVE_CH_LAYOUT
AVChannelLayout layout;
av_channel_layout_from_mask(&layout, info.channel_layout);
av_opt_set_chlayout(avr_planar, "in_chlayout", &layout, 0);
av_opt_set_chlayout(avr_planar, "out_chlayout", &layout, 0);
#else
av_opt_set_int(avr_planar, "in_channel_layout", info.channel_layout, 0);
av_opt_set_int(avr_planar, "out_channel_layout", info.channel_layout, 0);
av_opt_set_int(avr_planar, "in_channels", info.channels, 0);
av_opt_set_int(avr_planar, "out_channels", info.channels, 0);
#endif
av_opt_set_int(avr_planar, "in_sample_fmt", output_sample_fmt, 0);
av_opt_set_int(avr_planar, "out_sample_fmt", audio_codec_ctx->sample_fmt, 0); // planar not allowed here
av_opt_set_int(avr_planar, "in_sample_rate", info.sample_rate, 0);
av_opt_set_int(avr_planar, "out_sample_rate", info.sample_rate, 0);
SWR_INIT(avr_planar);
}
// Create input frame (and allocate arrays)
audio_frame = AV_ALLOCATE_FRAME();
AV_RESET_FRAME(audio_frame);
audio_frame->nb_samples = audio_input_position / info.channels;
// Create a new array
final_samples_planar = (int16_t *) av_malloc(
sizeof(int16_t) * audio_frame->nb_samples * info.channels
* (av_get_bytes_per_sample(output_sample_fmt) /
av_get_bytes_per_sample(AV_SAMPLE_FMT_S16) )
);
// Copy audio into buffer for frame
memcpy(final_samples_planar, samples,
static_cast<size_t>(audio_frame->nb_samples)
* info.channels
* av_get_bytes_per_sample(output_sample_fmt));
// Fill input frame with sample data
avcodec_fill_audio_frame(audio_frame, info.channels, output_sample_fmt,
(uint8_t *) final_samples_planar, audio_encoder_buffer_size, 0);
// Create output frame (and allocate arrays)
frame_final->nb_samples = audio_input_frame_size;
#if HAVE_CH_LAYOUT
av_channel_layout_from_mask(&frame_final->ch_layout, info.channel_layout);
#else
frame_final->channels = info.channels;
frame_final->channel_layout = info.channel_layout;
#endif
frame_final->format = audio_codec_ctx->sample_fmt;
av_samples_alloc(frame_final->data, frame_final->linesize, info.channels,
frame_final->nb_samples, audio_codec_ctx->sample_fmt, 0);
// Convert audio samples
int nb_samples = SWR_CONVERT(
avr_planar, // audio resample context
frame_final->data, // output data pointers
frame_final->linesize[0], // output plane size, in bytes. (0 if unknown)
frame_final->nb_samples, // maximum number of samples that the output buffer can hold
audio_frame->data, // input data pointers
audio_frame->linesize[0], // input plane size, in bytes (0 if unknown)
audio_frame->nb_samples // number of input samples to convert
);
// Copy audio samples over original samples
const auto copy_length = static_cast<size_t>(nb_samples)
* av_get_bytes_per_sample(audio_codec_ctx->sample_fmt)
* info.channels;
if (nb_samples > 0)
memcpy(samples, frame_final->data[0], copy_length);
// deallocate AVFrame
av_freep(&(audio_frame->data[0]));
AV_FREE_FRAME(&audio_frame);
all_queued_samples = NULL; // this array cleared with above call
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_audio_packets (Successfully completed 2nd resampling for Planar formats)",
"nb_samples", nb_samples);
} else {
// Create a new array
const auto buf_size = static_cast<size_t>(audio_input_position)
* (av_get_bytes_per_sample(audio_codec_ctx->sample_fmt) /
av_get_bytes_per_sample(AV_SAMPLE_FMT_S16)
);
final_samples = reinterpret_cast<int16_t*>(
av_malloc(sizeof(int16_t) * buf_size));
// Copy audio into buffer for frame
memcpy(final_samples, samples,
audio_input_position * av_get_bytes_per_sample(audio_codec_ctx->sample_fmt));
// Init the nb_samples property
frame_final->nb_samples = audio_input_frame_size;
// Fill the final_frame AVFrame with audio (non planar)
#if HAVE_CH_LAYOUT
int nb_channels = audio_codec_ctx->ch_layout.nb_channels;
#else
int nb_channels = audio_codec_ctx->channels;
#endif
avcodec_fill_audio_frame(frame_final, nb_channels,
audio_codec_ctx->sample_fmt, (uint8_t *) final_samples,
audio_encoder_buffer_size, 0);
}
// Set the AVFrame's PTS
frame_final->pts = audio_timestamp;
// Init the packet
#if IS_FFMPEG_3_2
AVPacket* pkt = av_packet_alloc();
#else
AVPacket* pkt;
av_init_packet(pkt);
#endif
pkt->data = audio_encoder_buffer;
pkt->size = audio_encoder_buffer_size;
// Set the packet's PTS prior to encoding
pkt->pts = pkt->dts = audio_timestamp;
/* encode the audio samples */
int got_packet_ptr = 0;
#if IS_FFMPEG_3_2
// Encode audio (latest version of FFmpeg)
int error_code;
int ret = 0;
int frame_finished = 0;
error_code = ret = avcodec_send_frame(audio_codec_ctx, frame_final);
if (ret < 0 && ret != AVERROR(EINVAL) && ret != AVERROR_EOF) {
avcodec_send_frame(audio_codec_ctx, NULL);
}
else {
if (ret >= 0)
pkt->size = 0;
ret = avcodec_receive_packet(audio_codec_ctx, pkt);
if (ret >= 0)
frame_finished = 1;
if(ret == AVERROR(EINVAL) || ret == AVERROR_EOF) {
avcodec_flush_buffers(audio_codec_ctx);
ret = 0;
}
if (ret >= 0) {
ret = frame_finished;
}
}
if (!pkt->data && !frame_finished)
{
ret = -1;
}
got_packet_ptr = ret;
#else
// Encode audio (older versions of FFmpeg)
int error_code = avcodec_encode_audio2(audio_codec_ctx, pkt, frame_final, &got_packet_ptr);
#endif
/* if zero size, it means the image was buffered */
if (error_code == 0 && got_packet_ptr) {
// Since the PTS can change during encoding, set the value again. This seems like a huge hack,
// but it fixes lots of PTS related issues when I do this.
pkt->pts = pkt->dts = audio_timestamp;
// Scale the PTS to the audio stream timebase (which is sometimes different than the codec's timebase)
av_packet_rescale_ts(pkt, audio_codec_ctx->time_base, audio_st->time_base);
// set stream
pkt->stream_index = audio_st->index;
pkt->flags |= AV_PKT_FLAG_KEY;
/* write the compressed frame in the media file */
error_code = av_interleaved_write_frame(oc, pkt);
}
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_audio_packets ERROR ["
+ av_err2string(error_code) + "]",
"error_code", error_code);
}
// Increment PTS (no pkt.duration, so calculate with maths)
audio_timestamp += FFMIN(audio_input_frame_size, audio_input_position);
// deallocate AVFrame
av_freep(&(frame_final->data[0]));
AV_FREE_FRAME(&frame_final);
// deallocate memory for packet
AV_FREE_PACKET(pkt);
// Reset position
audio_input_position = 0;
is_final = false;
}
// Delete arrays (if needed)
if (all_resampled_samples) {
av_freep(&all_resampled_samples);
all_resampled_samples = NULL;
}
if (all_queued_samples) {
av_freep(&all_queued_samples);
all_queued_samples = NULL;
}
}
// Allocate an AVFrame object
AVFrame *FFmpegWriter::allocate_avframe(PixelFormat pix_fmt, int width, int height, int *buffer_size, uint8_t *new_buffer) {
// Create an RGB AVFrame
AVFrame *new_av_frame = NULL;
// Allocate an AVFrame structure
new_av_frame = AV_ALLOCATE_FRAME();
if (new_av_frame == NULL)
throw OutOfMemory("Could not allocate AVFrame", path);
// Determine required buffer size and allocate buffer
*buffer_size = AV_GET_IMAGE_SIZE(pix_fmt, width, height);
// Create buffer (if not provided)
if (!new_buffer) {
// New Buffer
new_buffer = (uint8_t *) av_malloc(*buffer_size * sizeof(uint8_t));
// Attach buffer to AVFrame
AV_COPY_PICTURE_DATA(new_av_frame, new_buffer, pix_fmt, width, height);
new_av_frame->width = width;
new_av_frame->height = height;
new_av_frame->format = pix_fmt;
}
// return AVFrame
return new_av_frame;
}
// process video frame
void FFmpegWriter::process_video_packet(std::shared_ptr<Frame> frame) {
// Determine the height & width of the source image
int source_image_width = frame->GetWidth();
int source_image_height = frame->GetHeight();
// Do nothing if size is 1x1 (i.e. no image in this frame)
if (source_image_height == 1 && source_image_width == 1)
return;
// Init rescalers (if not initialized yet)
if (image_rescalers.size() == 0)
InitScalers(source_image_width, source_image_height);
// Get a unique rescaler (for this thread)
SwsContext *scaler = image_rescalers[rescaler_position];
rescaler_position++;
if (rescaler_position == num_of_rescalers)
rescaler_position = 0;
// Allocate an RGB frame & final output frame
int bytes_source = 0;
int bytes_final = 0;
AVFrame *frame_source = NULL;
const uchar *pixels = NULL;
// Get a list of pixels from source image
pixels = frame->GetPixels();
// Init AVFrame for source image & final (converted image)
frame_source = allocate_avframe(PIX_FMT_RGBA, source_image_width, source_image_height, &bytes_source, (uint8_t *) pixels);
#if IS_FFMPEG_3_2
AVFrame *frame_final;
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
frame_final = allocate_avframe(AV_PIX_FMT_NV12, info.width, info.height, &bytes_final, NULL);
} else
#endif // USE_HW_ACCEL
{
frame_final = allocate_avframe(
(AVPixelFormat)(video_st->codecpar->format),
info.width, info.height, &bytes_final, NULL
);
}
#else
AVFrame *frame_final = allocate_avframe(video_codec_ctx->pix_fmt, info.width, info.height, &bytes_final, NULL);
#endif // IS_FFMPEG_3_2
// Fill with data
AV_COPY_PICTURE_DATA(frame_source, (uint8_t *) pixels, PIX_FMT_RGBA, source_image_width, source_image_height);
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::process_video_packet",
"frame->number", frame->number,
"bytes_source", bytes_source,
"bytes_final", bytes_final);
// Resize & convert pixel format
sws_scale(scaler, frame_source->data, frame_source->linesize, 0,
source_image_height, frame_final->data, frame_final->linesize);
// Add resized AVFrame to av_frames map
add_avframe(frame, frame_final);
// Deallocate memory
AV_FREE_FRAME(&frame_source);
}
// write video frame
bool FFmpegWriter::write_video_packet(std::shared_ptr<Frame> frame, AVFrame *frame_final) {
#if (LIBAVFORMAT_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_video_packet",
"frame->number", frame->number,
"oc->oformat->flags", oc->oformat->flags);
if (AV_GET_CODEC_TYPE(video_st) == AVMEDIA_TYPE_VIDEO && AV_FIND_DECODER_CODEC_ID(video_st) == AV_CODEC_ID_RAWVIDEO) {
#else
// TODO: Should we have moved away from oc->oformat->flags / AVFMT_RAWPICTURE
// on ffmpeg < 4.0 as well?
// Does AV_CODEC_ID_RAWVIDEO not work in ffmpeg 3.x?
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_video_packet",
"frame->number", frame->number,
"oc->oformat->flags & AVFMT_RAWPICTURE", oc->oformat->flags & AVFMT_RAWPICTURE);
if (oc->oformat->flags & AVFMT_RAWPICTURE) {
#endif
// Raw video case.
#if IS_FFMPEG_3_2
AVPacket* pkt = av_packet_alloc();
#else
AVPacket* pkt;
av_init_packet(pkt);
#endif
av_packet_from_data(
pkt, frame_final->data[0],
frame_final->linesize[0] * frame_final->height);
pkt->flags |= AV_PKT_FLAG_KEY;
pkt->stream_index = video_st->index;
// Set PTS (in frames and scaled to the codec's timebase)
pkt->pts = video_timestamp;
/* write the compressed frame in the media file */
int error_code = av_interleaved_write_frame(oc, pkt);
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_video_packet ERROR ["
+ av_err2string(error_code) + "]",
"error_code", error_code);
return false;
}
// Deallocate packet
AV_FREE_PACKET(pkt);
} else
{
#if IS_FFMPEG_3_2
AVPacket* pkt = av_packet_alloc();
#else
AVPacket* pkt;
av_init_packet(pkt);
#endif
pkt->data = NULL;
pkt->size = 0;
pkt->pts = pkt->dts = AV_NOPTS_VALUE;
// Assign the initial AVFrame PTS from the frame counter
frame_final->pts = video_timestamp;
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
if (!(hw_frame = av_frame_alloc())) {
std::clog << "Error code: av_hwframe_alloc\n";
}
if (av_hwframe_get_buffer(video_codec_ctx->hw_frames_ctx, hw_frame, 0) < 0) {
std::clog << "Error code: av_hwframe_get_buffer\n";
}
if (!hw_frame->hw_frames_ctx) {
std::clog << "Error hw_frames_ctx.\n";
}
hw_frame->format = AV_PIX_FMT_NV12;
if ( av_hwframe_transfer_data(hw_frame, frame_final, 0) < 0) {
std::clog << "Error while transferring frame data to surface.\n";
}
av_frame_copy_props(hw_frame, frame_final);
}
#endif // USE_HW_ACCEL
/* encode the image */
int got_packet_ptr = 0;
int error_code = 0;
#if IS_FFMPEG_3_2
// Write video packet
int ret;
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
ret = avcodec_send_frame(video_codec_ctx, hw_frame); //hw_frame!!!
} else
#endif // USE_HW_ACCEL
{
ret = avcodec_send_frame(video_codec_ctx, frame_final);
}
error_code = ret;
if (ret < 0 ) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_video_packet (Frame not sent)");
if (ret == AVERROR(EAGAIN) ) {
std::clog << "Frame EAGAIN\n";
}
if (ret == AVERROR_EOF ) {
std::clog << "Frame AVERROR_EOF\n";
}
avcodec_send_frame(video_codec_ctx, NULL);
}
else {
while (ret >= 0) {
ret = avcodec_receive_packet(video_codec_ctx, pkt);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
avcodec_flush_buffers(video_codec_ctx);
got_packet_ptr = 0;
break;
}
if (ret == 0) {
got_packet_ptr = 1;
break;
}
}
}
#else
// Write video packet (older than FFmpeg 3.2)
error_code = avcodec_encode_video2(video_codec_ctx, pkt, frame_final, &got_packet_ptr);
if (error_code != 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_video_packet ERROR ["
+ av_err2string(error_code) + "]",
"error_code", error_code);
}
if (got_packet_ptr == 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_video_packet (Frame gotpacket error)");
}
#endif // IS_FFMPEG_3_2
/* if zero size, it means the image was buffered */
if (error_code == 0 && got_packet_ptr) {
// set the timestamp
av_packet_rescale_ts(pkt, video_codec_ctx->time_base, video_st->time_base);
pkt->stream_index = video_st->index;
/* write the compressed frame in the media file */
int result = av_interleaved_write_frame(oc, pkt);
if (result < 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_video_packet ERROR ["
+ av_err2string(result) + "]",
"result", result);
return false;
}
}
// Deallocate packet
AV_FREE_PACKET(pkt);
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
if (hw_frame) {
av_frame_free(&hw_frame);
hw_frame = NULL;
}
}
#endif // USE_HW_ACCEL
}
// Increment PTS (in frames and scaled to the codec's timebase)
video_timestamp += av_rescale_q(1, av_make_q(info.fps.den, info.fps.num), video_codec_ctx->time_base);
// Success
return true;
}
// Output the ffmpeg info about this format, streams, and codecs (i.e. dump format)
void FFmpegWriter::OutputStreamInfo() {
// output debug info
av_dump_format(oc, 0, path.c_str(), 1);
}
// Init a collection of software rescalers (thread safe)
void FFmpegWriter::InitScalers(int source_width, int source_height) {
int scale_mode = SWS_FAST_BILINEAR;
if (openshot::Settings::Instance()->HIGH_QUALITY_SCALING) {
scale_mode = SWS_BICUBIC;
}
// Init software rescalers vector (many of them, one for each thread)
for (int x = 0; x < num_of_rescalers; x++) {
// Init the software scaler from FFMpeg
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
img_convert_ctx = sws_getContext(source_width, source_height, PIX_FMT_RGBA,
info.width, info.height, AV_PIX_FMT_NV12, scale_mode, NULL, NULL, NULL);
} else
#endif // USE_HW_ACCEL
{
img_convert_ctx = sws_getContext(source_width, source_height, PIX_FMT_RGBA,
info.width, info.height, AV_GET_CODEC_PIXEL_FORMAT(video_st, video_st->codec),
scale_mode, NULL, NULL, NULL);
}
// Add rescaler to vector
image_rescalers.push_back(img_convert_ctx);
}
}
// Set audio resample options
void FFmpegWriter::ResampleAudio(int sample_rate, int channels) {
original_sample_rate = sample_rate;
original_channels = channels;
}
// Remove & deallocate all software scalers
void FFmpegWriter::RemoveScalers() {
// Close all rescalers
for (int x = 0; x < num_of_rescalers; x++)
sws_freeContext(image_rescalers[x]);
// Clear vector
image_rescalers.clear();
}
Exceptions.h
Header file for all Exception classes.
FFmpegUtilities.h
Header file for FFmpegUtilities.
AV_FREE_CONTEXT
#define AV_FREE_CONTEXT(av_context)
Definition FFmpegUtilities.h:204
SWR_INIT
#define SWR_INIT(ctx)
Definition FFmpegUtilities.h:149
AUDIO_PACKET_ENCODING_SIZE
#define AUDIO_PACKET_ENCODING_SIZE
Definition FFmpegUtilities.h:85
AV_GET_CODEC_FROM_STREAM
#define AV_GET_CODEC_FROM_STREAM(av_stream, codec_in)
Definition FFmpegUtilities.h:212
AV_SET_FILENAME
#define AV_SET_FILENAME(oc, f)
Definition FFmpegUtilities.h:196
PIX_FMT_YUV420P
#define PIX_FMT_YUV420P
Definition FFmpegUtilities.h:114
AV_FREE_FRAME
#define AV_FREE_FRAME(av_frame)
Definition FFmpegUtilities.h:202
SWR_CONVERT
#define SWR_CONVERT(ctx, out, linesize, out_count, in, linesize2, in_count)
Definition FFmpegUtilities.h:144
AV_GET_IMAGE_SIZE
#define AV_GET_IMAGE_SIZE(pix_fmt, width, height)
Definition FFmpegUtilities.h:217
AV_OPTION_FIND
#define AV_OPTION_FIND(priv_data, name)
Definition FFmpegUtilities.h:222
AV_OUTPUT_CONTEXT
#define AV_OUTPUT_CONTEXT(output_context, path)
Definition FFmpegUtilities.h:220
SWR_ALLOC
#define SWR_ALLOC()
Definition FFmpegUtilities.h:146
SWR_CLOSE
#define SWR_CLOSE(ctx)
Definition FFmpegUtilities.h:147
AV_GET_CODEC_TYPE
#define AV_GET_CODEC_TYPE(av_stream)
Definition FFmpegUtilities.h:205
PixelFormat
#define PixelFormat
Definition FFmpegUtilities.h:102
ALLOC_CODEC_CTX
#define ALLOC_CODEC_CTX(ctx, codec, stream)
Definition FFmpegUtilities.h:226
AV_GET_CODEC_PIXEL_FORMAT
#define AV_GET_CODEC_PIXEL_FORMAT(av_stream, av_context)
Definition FFmpegUtilities.h:214
AV_COPY_PARAMS_FROM_CONTEXT
#define AV_COPY_PARAMS_FROM_CONTEXT(av_stream, av_codec)
Definition FFmpegUtilities.h:228
AV_FIND_DECODER_CODEC_ID
#define AV_FIND_DECODER_CODEC_ID(av_stream)
Definition FFmpegUtilities.h:206
AV_ALLOCATE_FRAME
#define AV_ALLOCATE_FRAME()
Definition FFmpegUtilities.h:198
PIX_FMT_RGB24
#define PIX_FMT_RGB24
Definition FFmpegUtilities.h:111
AV_GET_CODEC_PAR_CONTEXT
#define AV_GET_CODEC_PAR_CONTEXT(av_stream, av_codec)
Definition FFmpegUtilities.h:211
PIX_FMT_YUV444P
#define PIX_FMT_YUV444P
Definition FFmpegUtilities.h:117
AV_REGISTER_ALL
#define AV_REGISTER_ALL
Definition FFmpegUtilities.h:193
PIX_FMT_NONE
#define PIX_FMT_NONE
Definition FFmpegUtilities.h:108
PIX_FMT_RGBA
#define PIX_FMT_RGBA
Definition FFmpegUtilities.h:105
SWR_FREE
#define SWR_FREE(ctx)
Definition FFmpegUtilities.h:148
AV_COPY_PICTURE_DATA
#define AV_COPY_PICTURE_DATA(av_frame, buffer, pix_fmt, width, height)
Definition FFmpegUtilities.h:218
AV_OPTION_SET
#define AV_OPTION_SET(av_stream, priv_data, name, value, avcodec)
Definition FFmpegUtilities.h:223
AV_FREE_PACKET
#define AV_FREE_PACKET(av_packet)
Definition FFmpegUtilities.h:203
AVCODEC_MAX_AUDIO_FRAME_SIZE
#define AVCODEC_MAX_AUDIO_FRAME_SIZE
Definition FFmpegUtilities.h:78
AV_GET_CODEC_ATTRIBUTES
#define AV_GET_CODEC_ATTRIBUTES(av_stream, av_context)
Definition FFmpegUtilities.h:213
MY_INPUT_BUFFER_PADDING_SIZE
#define MY_INPUT_BUFFER_PADDING_SIZE
Definition FFmpegUtilities.h:197
AV_RESET_FRAME
#define AV_RESET_FRAME(av_frame)
Definition FFmpegUtilities.h:201
hw_en_on
int hw_en_on
Definition FFmpegWriter.cpp:37
hw_en_av_pix_fmt
AVPixelFormat hw_en_av_pix_fmt
Definition FFmpegWriter.cpp:39
if
if(avcodec_open2(video_codec_ctx, codec, &opts)< 0) throw InvalidCodec("Could not open video codec"
opts
AVDictionary * opts
Definition FFmpegWriter.cpp:1486
hw_en_av_device_type
AVHWDeviceType hw_en_av_device_type
Definition FFmpegWriter.cpp:40
codec
codec
Definition FFmpegWriter.cpp:1475
hw_en_supported
int hw_en_supported
Definition FFmpegWriter.cpp:38
hw_frame
AVFrame * hw_frame
Definition FFmpegWriter.cpp:42
path
path
Definition FFmpegWriter.cpp:1479
mux_dict
AVDictionary * mux_dict
Definition FFmpegWriter.cpp:34
FFmpegWriter.h
Header file for FFmpegWriter class.
Frame.h
Header file for Frame class.
OpenMPUtilities.h
Header file for OpenMPUtilities (set some common macros)
FF_NUM_PROCESSORS
#define FF_NUM_PROCESSORS
Definition OpenMPUtilities.h:24
Settings.h
Header file for global Settings class.
ZmqLogger.h
Header file for ZeroMQ-based Logger class.
openshot::ErrorEncodingVideo
Exception when encoding audio packet.
Definition Exceptions.h:143
openshot::FFmpegWriter::Close
void Close()
Close the writer.
Definition FFmpegWriter.cpp:967
openshot::FFmpegWriter::SetAudioOptions
void SetAudioOptions(bool has_audio, std::string codec, int sample_rate, int channels, openshot::ChannelLayout channel_layout, int bit_rate)
Set audio export options.
Definition FFmpegWriter.cpp:286
openshot::FFmpegWriter::SetOption
void SetOption(openshot::StreamType stream, std::string name, std::string value)
Set custom options (some codecs accept additional params). This must be called after the PrepareStrea...
Definition FFmpegWriter.cpp:333
openshot::FFmpegWriter::PrepareStreams
void PrepareStreams()
Prepare & initialize streams and open codecs. This method is called automatically by the Open() metho...
Definition FFmpegWriter.cpp:615
openshot::FFmpegWriter::SetVideoOptions
void SetVideoOptions(bool has_video, std::string codec, openshot::Fraction fps, int width, int height, openshot::Fraction pixel_ratio, bool interlaced, bool top_field_first, int bit_rate)
Set video export options.
Definition FFmpegWriter.cpp:163
openshot::FFmpegWriter::ResampleAudio
void ResampleAudio(int sample_rate, int channels)
Set audio resample options.
Definition FFmpegWriter.cpp:2331
openshot::FFmpegWriter::Open
void Open()
Open writer.
Definition FFmpegWriter.cpp:95
openshot::FFmpegWriter::WriteHeader
void WriteHeader()
Write the file header (after the options are set). This method is called automatically by the Open() ...
Definition FFmpegWriter.cpp:632
openshot::FFmpegWriter::FFmpegWriter
FFmpegWriter(const std::string &path)
Constructor for FFmpegWriter. Throws an exception on failure to open path.
Definition FFmpegWriter.cpp:75
openshot::FFmpegWriter::IsValidCodec
static bool IsValidCodec(std::string codec_name)
Determine if codec name is valid.
Definition FFmpegWriter.cpp:603
openshot::FFmpegWriter::OutputStreamInfo
void OutputStreamInfo()
Output the ffmpeg info about this format, streams, and codecs (i.e. dump format)
Definition FFmpegWriter.cpp:2298
openshot::FFmpegWriter::WriteFrame
void WriteFrame(std::shared_ptr< openshot::Frame > frame)
Add a frame to the stack waiting to be encoded.
Definition FFmpegWriter.cpp:677
openshot::FFmpegWriter::WriteTrailer
void WriteTrailer()
Write the file trailer (after all frames are written). This is called automatically by the Close() me...
Definition FFmpegWriter.cpp:754
openshot::FFmpegWriter::RemoveScalers
void RemoveScalers()
Remove & deallocate all software scalers.
Definition FFmpegWriter.cpp:2337
openshot::Fraction
This class represents a fraction.
Definition Fraction.h:30
openshot::Fraction::num
int num
Numerator for the fraction.
Definition Fraction.h:32
openshot::Fraction::Reduce
void Reduce()
Reduce this fraction (i.e. 640/480 = 4/3)
Definition Fraction.cpp:65
openshot::Fraction::den
int den
Denominator for the fraction.
Definition Fraction.h:33
openshot::InvalidChannels
Exception when an invalid # of audio channels are detected.
Definition Exceptions.h:158
openshot::InvalidCodec
Exception when no valid codec is found for a file.
Definition Exceptions.h:173
openshot::InvalidFile
Exception for files that can not be found or opened.
Definition Exceptions.h:188
openshot::InvalidFormat
Exception when no valid format is found for a file.
Definition Exceptions.h:203
openshot::InvalidOptions
Exception when invalid encoding options are used.
Definition Exceptions.h:233
openshot::InvalidSampleRate
Exception when invalid sample rate is detected during encoding.
Definition Exceptions.h:248
openshot::NoStreamsFound
Exception when no streams are found in the file.
Definition Exceptions.h:286
openshot::OutOfMemory
Exception when memory could not be allocated.
Definition Exceptions.h:349
openshot::ReaderBase
This abstract class is the base class, used by all readers in libopenshot.
Definition ReaderBase.h:76
openshot::ReaderBase::GetFrame
virtual std::shared_ptr< openshot::Frame > GetFrame(int64_t number)=0
openshot::Settings::Instance
static Settings * Instance()
Create or get an instance of this logger singleton (invoke the class with this method)
Definition Settings.cpp:23
openshot::Settings::HW_EN_DEVICE_SET
int HW_EN_DEVICE_SET
Which GPU to use to encode (0 is the first)
Definition Settings.h:83
openshot::WriterBase::info
WriterInfo info
Information about the current media file.
Definition WriterBase.h:76
openshot::WriterClosed
Exception when a writer is closed, and a frame is requested.
Definition Exceptions.h:416
openshot::ZmqLogger::AppendDebugMethod
void AppendDebugMethod(std::string method_name, std::string arg1_name="", float arg1_value=-1.0, std::string arg2_name="", float arg2_value=-1.0, std::string arg3_name="", float arg3_value=-1.0, std::string arg4_name="", float arg4_value=-1.0, std::string arg5_name="", float arg5_value=-1.0, std::string arg6_name="", float arg6_value=-1.0)
Append debug information.
Definition ZmqLogger.cpp:178
openshot::ZmqLogger::Instance
static ZmqLogger * Instance()
Create or get an instance of this logger singleton (invoke the class with this method)
Definition ZmqLogger.cpp:35
openshot
This namespace is the default namespace for all code in the openshot library.
Definition Compressor.h:29
openshot::ChannelLayout
ChannelLayout
This enumeration determines the audio channel layout (such as stereo, mono, 5 point surround,...
Definition ChannelLayouts.h:29
openshot::LAYOUT_STEREO
@ LAYOUT_STEREO
Definition ChannelLayouts.h:31
openshot::LAYOUT_MONO
@ LAYOUT_MONO
Definition ChannelLayouts.h:30
openshot::StreamType
StreamType
This enumeration designates the type of stream when encoding (video or audio)
Definition FFmpegWriter.h:28
openshot::AUDIO_STREAM
@ AUDIO_STREAM
An audio stream (used to determine which type of stream)
Definition FFmpegWriter.h:30
openshot::VIDEO_STREAM
@ VIDEO_STREAM
A video stream (used to determine which type of stream)
Definition FFmpegWriter.h:29
openshot::WriterInfo::height
int height
The height of the video (in pixels)
Definition WriterBase.h:39
openshot::WriterInfo::audio_bit_rate
int audio_bit_rate
The bit rate of the audio stream (in bytes)
Definition WriterBase.h:53
openshot::WriterInfo::video_bit_rate
int video_bit_rate
The bit rate of the video stream (in bytes)
Definition WriterBase.h:43
openshot::WriterInfo::has_audio
bool has_audio
Determines if this file has an audio stream.
Definition WriterBase.h:35
openshot::WriterInfo::top_field_first
bool top_field_first
Which interlaced field should be displayed first.
Definition WriterBase.h:51
openshot::WriterInfo::channels
int channels
The number of audio channels used in the audio stream.
Definition WriterBase.h:55
openshot::WriterInfo::vcodec
std::string vcodec
The name of the video codec used to encode / decode the video stream.
Definition WriterBase.h:46
openshot::WriterInfo::has_video
bool has_video
Determines if this file has a video stream.
Definition WriterBase.h:34
openshot::WriterInfo::metadata
std::map< std::string, std::string > metadata
An optional map/dictionary of video & audio metadata.
Definition WriterBase.h:59
openshot::WriterInfo::fps
openshot::Fraction fps
Frames per second, as a fraction (i.e. 24/1 = 24 fps)
Definition WriterBase.h:42
openshot::WriterInfo::acodec
std::string acodec
The name of the audio codec used to encode / decode the video stream.
Definition WriterBase.h:52
openshot::WriterInfo::video_timebase
openshot::Fraction video_timebase
The video timebase determines how long each frame stays on the screen.
Definition WriterBase.h:49
openshot::WriterInfo::channel_layout
openshot::ChannelLayout channel_layout
The channel layout (mono, stereo, 5 point surround, etc...)
Definition WriterBase.h:56
openshot::WriterInfo::display_ratio
openshot::Fraction display_ratio
The ratio of width to height of the video stream (i.e. 640x480 has a ratio of 4/3)
Definition WriterBase.h:45
openshot::WriterInfo::width
int width
The width of the video (in pixels)
Definition WriterBase.h:40
openshot::WriterInfo::pixel_ratio
openshot::Fraction pixel_ratio
The pixel ratio of the video stream as a fraction (i.e. some pixels are not square)
Definition WriterBase.h:44
openshot::WriterInfo::sample_rate
int sample_rate
The number of audio samples per second (44100 is a common sample rate)
Definition WriterBase.h:54
openshot::WriterInfo::interlaced_frame
bool interlaced_frame
Are the contents of this frame interlaced.
Definition WriterBase.h:50