Hi all,
I'm really a bit lost and I was hoping that somebody could help me out by
explaining a couple of things. With the code attached I can generate a .mp4
file and it shows the correct image if I play it in VLC, but the length of the
movie is not correct. I have a camera stream that I want to capture (no sound).
The first captured image is very important for my algorithm. I want to know
1. Because my first 13 frame were not written to the .mp4 file, I ended up
sending the first frame to the encoder (addBufferFrames) until EAGAIN is not
returned anymore. Is this good practice or not? and why does the encoder need
those frames, I'm using intra frame compression so each frame should be encoded
without any other frame, right?
2. Since the frame rate is 24 fps and I save 120 frames (see log.txt) I
should end up with 5 secs of movie but instead it's only 4 secs if I play it in
VLC
I would really appreciate it if someone could help me with this.
#ifndef IMAGE_H
#define IMAGE_H
#include <mat.hpp>
class Image
{
public:
Image();
Image( const cv::Mat& mat );
Image(const Image& other) = default;
Image(Image&& other) = default;
~Image();
inline const cv::Mat& matrix() const{ return m_matrix; }
inline const int uniqueImageNumber() const{ return m_uniqueId; }
inline const int timeStamp() const { return m_timeStamp; }
inline const int width() const { return m_matrix.cols(); }
inline const int height() const { return m_matrix.rows(); }
private:
cv::Mat m_matrix;
int m_timeStamp;
int m_uniqueId;
};
#endif#pragma once
#include "xmoviecodec.h"
#include <QDebug>
#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */
#define OUTPUT_CODEC AV_CODEC_ID_H264
const double streamDuration( 5.0 );
const int streamFrameRate( 24 );
const int streamNumberOfFrames ((int)(streamDuration * streamFrameRate));
int XMovieCodec::s_frameCount = 0;
XMovieCodec::XMovieCodec( const char* filename ) :
m_filename( filename ),
m_encoder( avcodec_find_encoder( OUTPUT_CODEC ))
{
av_log_set_level(AV_LOG_VERBOSE);
int ret(0);
/** Allocate the output media context */
ret = avformat_alloc_output_context2( &m_formatCtx, m_outputFormat, "mp4",
m_filename.c_str());
if (!m_formatCtx)
return;
m_outputFormat = m_formatCtx->oformat;
/** Allocate the codec context */
m_codecCtx = avcodec_alloc_context3( m_encoder);
/** Add the video stream using H264 codec */
addStream();
if( !m_streamOut )
return;
configureEncoder();
/** Open the output media file, if needed */
if (!( m_outputFormat->flags & AVFMT_NOFILE))
{
ret = avio_open( &m_formatCtx->pb, m_filename.c_str(), AVIO_FLAG_WRITE);
checkError( ret, "Could not open file : " );
}
else
{
return;
}
/** Write media header */
ret = avformat_write_header( m_formatCtx, NULL );
checkError( ret,"Error occurred when opening output file: ");
}
XMovieCodec::~XMovieCodec()
{
}
/* Add an output stream. */
void XMovieCodec::addStream()
{
if (!( m_encoder ))
{
fprintf(stderr, "Could not find encoder for '%s'\n",
avcodec_get_name( OUTPUT_CODEC ));
return;
}
/** Get the stream for codec */
m_streamOut = avformat_new_stream(m_formatCtx, m_encoder);
if (!m_streamOut) {
fprintf(stderr, "Could not allocate stream\n");
return;
}
m_streamOut->id = m_formatCtx->nb_streams - 1;
if( m_encoder->type == AVMEDIA_TYPE_VIDEO )
{
m_streamOut->codecpar->codec_id = OUTPUT_CODEC;
m_streamOut->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
m_streamOut->codecpar->bit_rate = 4 * 1000 * 1000;
m_streamOut->codecpar->width = 800;
m_streamOut->codecpar->height = 640;
m_streamOut->codecpar->format = STREAM_PIX_FMT;
m_streamOut->r_frame_rate = { streamFrameRate, 1 };
m_streamOut->avg_frame_rate = { streamFrameRate, 1 };
m_streamOut->time_base = { 1, streamFrameRate };
}
}
void XMovieCodec::configureEncoder()
{
m_codecCtx->gop_size = 0;
m_codecCtx->max_b_frames = 0;
m_codecCtx->time_base = { 1, streamFrameRate };
m_codecCtx->framerate = { streamFrameRate, 1 };
m_codecCtx->pix_fmt = STREAM_PIX_FMT;
m_codecCtx->width = 800;
m_codecCtx->height = 640;
m_codecCtx->codec_id = OUTPUT_CODEC;
if (m_streamOut->codecpar->codec_id == OUTPUT_CODEC)
av_opt_set( m_codecCtx->priv_data, "preset", "ultrafast", 0 );
/* open the codec */
int ret = avcodec_open2(m_codecCtx, m_encoder, 0 );
checkError( ret, "Could not open video codec: ");
}
void XMovieCodec::encodeImage(const Image &image)
{
if( m_setStartTime )
{
m_startTime = image.timeStamp();
m_setStartTime = false;
m_storeInBuffer = true;
}
if (!m_streamOut )
return;
AVFrame* frame = av_frame_alloc();
createFrame( image, frame );
/**
* fill the encoding buffer with the first image repeatably
*/
addBufferFrames( frame );
/**
* Add a video frame
*/
writeFrame( frame );
if( frame )
{
av_free( frame->data[0]);
av_frame_free( &frame );
}
}
void XMovieCodec::writeFrame( AVFrame* frame )
{
int ret;
if ( s_frameCount >= streamNumberOfFrames)
{
/* No more frames to compress.*/
s_frameCount = streamNumberOfFrames;
}
frame->pts = s_frameCount;
if (m_formatCtx->oformat->flags & 0x0020 )
{
/* Raw video case - directly store the picture in the packet */
AVPacket pkt;
av_init_packet(&pkt);
pkt.flags |= AV_PKT_FLAG_KEY;
pkt.stream_index = m_streamOut->index;
pkt.data = frame->data[0];
pkt.size = sizeof(AVPicture);
ret = av_write_frame( m_formatCtx, &pkt );
}
else
{
AVPacket pkt;
av_init_packet(&pkt);
/* encode the image */
ret = avcodec_send_frame(m_codecCtx, frame);
qDebug() << "send unique " << frame->display_picture_number << " s_frame " <<
s_frameCount << " pts " << frame->pts ;
checkError( ret, "Error encoding video frame: ");
while( ret >= 0 )
{
ret = avcodec_receive_packet(m_codecCtx, &pkt);
if (ret == AVERROR(EAGAIN) /*|| ret == AVERROR_EOF*/)
{
qDebug() << "return EAGAIN" ;
return;
}
else if (ret < 0)
{
return;
}
m_storeInBuffer = false;
/** only the video stream index is available */
pkt.stream_index = m_streamOut->index;
pkt.pts = av_rescale_q( pkt.pts, m_codecCtx->time_base,
m_streamOut->time_base );
pkt.dts = av_rescale_q( pkt.dts, m_codecCtx->time_base,
m_streamOut->time_base );
qDebug() << "codec time " << m_codecCtx->pkt_timebase.den << " stream time " <<
m_streamOut->time_base.den;
// pkt.duration = av_rescale_q( pkt.duration,
m_codecCtx->pkt_timebase, m_streamOut->time_base );
ret = av_write_frame( m_formatCtx, &pkt );
qDebug() << "write packet : pts " << pkt.pts << " dts " << pkt.dts << "
duration " << pkt.duration;
s_frameCount++;
}
}
}
void XMovieCodec::createFrame( const Image& image, AVFrame* frame )
{
/**
* Save the raw image to disk
*/
//image.saveToFile("c:\\tmp\\RGBoriginal.png");
frame->format = STREAM_PIX_FMT;
frame->width = image.width();
frame->height = image.height();
frame->pict_type = AV_PICTURE_TYPE_I;
frame->display_picture_number = image.uniqueImageNumber();
int ret = av_image_alloc( frame->data, frame->linesize, frame->width,
frame->height, STREAM_PIX_FMT, 1);
if (ret < 0)
{
return;
}
struct SwsContext* sws_ctx = sws_getContext((int)image.width(),
(int)image.height(), AV_PIX_FMT_BGR24,
(int)image.width(),
(int)image.height(), STREAM_PIX_FMT, 0, NULL, NULL, NULL);
const uint8_t* rgbData[1] = { (uint8_t* )image.getData() };
int rgbLineSize[1] = { 3 * image.width() };
sws_scale(sws_ctx, rgbData, rgbLineSize, 0, image.height(), frame->data,
frame->linesize);
/**
* save frame to disk
*/
// saveFrameToDisk( frame );
}
void XMovieCodec::close()
{
/** reset the framecount */
s_frameCount = 0 ;
int ret( 0 );
/** flush the encoder */
while( ret >= 0 )
ret = avcodec_send_frame(m_codecCtx, NULL);
// Write media trailer
if( m_formatCtx )
ret = av_write_trailer( m_formatCtx );
/* Close the output file. */
if (!( m_outputFormat->flags & AVFMT_NOFILE))
ret = avio_close( m_formatCtx->pb);
/* free the stream */
avformat_free_context( m_formatCtx );
fflush( stdout );
}
void XMovieCodec::checkError( const int errID, const std::string& message )
{
if( errID != 0 )
{
char error[255];
av_strerror( errID, error, 255);
std::string err( message );
err.append( error );
Log::printLine( err );
qDebug() << err.c_str();
return;
}
}
void XMovieCodec::saveFrameToDisk( const AVFrame* frame )
{
cv::Mat yuv420p( frame->height + frame->height/2, frame->width, CV_8UC1,
frame->data[0]);
cv::Mat cvmIm;
cv::cvtColor(yuv420p,cvmIm,CV_YUV420p2BGR);
std::ostringstream ss;
ss << "c:\\tmp\\YUVoriginal_" << frame->display_picture_number << ".png";
cv::imwrite( ss.str().c_str(), cvmIm);
}
void XMovieCodec::addBufferFrames( AVFrame* frame )
{
if( m_storeInBuffer)
while( m_storeInBuffer )
{
writeFrame( frame );
}
}
#ifndef MOVIECODEC_H
#define MOVIECODEC_H
#include "image/Image.h"
extern "C"
{
#include "Codec/include/libavcodec/avcodec.h"
#include "Codec/include/libavdevice/avdevice.h"
#include "Codec/include/libavformat/avformat.h"
#include "Codec/include/libavutil/avutil.h"
#include "Codec/include/libavformat/avio.h"
#include "Codec/include/libavutil/imgutils.h"
#include "Codec/include/libavutil/opt.h"
#include "Codec/include/libswscale/swscale.h"
}
class MovieCodec
{
public:
MovieCodec(const char *filename);
~MovieCodec();
void encodeImage( const Image& image );
void close();
private:
void encode( AVFrame *frame, AVPacket *pkt );
void addStream();
void configureEncoder();
void writeFrame(AVFrame *frame );
void createFrame(const Image& image , AVFrame *frame);
void checkError( const int errID, const std::string& message );
void saveFrameToDisk(const AVFrame* frame );
void addBufferFrames(AVFrame *frame);
private:
static int s_frameCount;
bool m_setStartTime = true;
bool m_storeInBuffer = true;
int m_startTime;
std::string m_filename;
AVCodec* m_encoder = NULL;
AVOutputFormat* m_outputFormat = NULL;
AVFormatContext* m_formatCtx = NULL;
AVCodecContext* m_codecCtx = NULL;
AVStream* m_streamOut = NULL;
AVDictionary* m_opts = NULL;
};
#endif // MOVIECODEC_H
send unique 371 s_frame 0 pts 0
return EAGAIN
send unique 371 s_frame 0 pts 0
return EAGAIN
send unique 371 s_frame 0 pts 0
return EAGAIN
send unique 371 s_frame 0 pts 0
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send unique 371 s_frame 0 pts 0
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send unique 371 s_frame 0 pts 0
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send unique 371 s_frame 0 pts 0
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send unique 371 s_frame 0 pts 0
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send unique 371 s_frame 0 pts 0
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send unique 371 s_frame 0 pts 0
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send unique 371 s_frame 0 pts 0
codec time 1 stream time 12288
pts 0 dts 0 duration 0
return EAGAIN
send unique 371 s_frame 1 pts 1
codec time 1 stream time 12288
pts 0 dts 0 duration 0
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codec time 1 stream time 12288
pts 0 dts 0 duration 0
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codec time 1 stream time 12288
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codec time 1 stream time 12288
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codec time 1 stream time 12288
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send unique 380 s_frame 6 pts 6
codec time 1 stream time 12288
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send unique 382 s_frame 7 pts 7
codec time 1 stream time 12288
pts 0 dts 0 duration 0
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send unique 384 s_frame 8 pts 8
codec time 1 stream time 12288
pts 0 dts 0 duration 0
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send unique 386 s_frame 9 pts 9
codec time 1 stream time 12288
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codec time 1 stream time 12288
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codec time 1 stream time 12288
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codec time 1 stream time 12288
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return EAGAIN
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codec time 1 stream time 12288
pts 0 dts 0 duration 0
return EAGAIN
send unique 396 s_frame 14 pts 14
codec time 1 stream time 12288
pts 512 dts 512 duration 0
return EAGAIN
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pts 1024 dts 1024 duration 0
return EAGAIN
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codec time 1 stream time 12288
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return EAGAIN
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return EAGAIN
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return EAGAIN
send unique 576 s_frame 109 pts 109
codec time 1 stream time 12288
pts 49152 dts 49152 duration 0
return EAGAIN
send unique 578 s_frame 110 pts 110
codec time 1 stream time 12288
pts 49664 dts 49664 duration 0
return EAGAIN
send unique 580 s_frame 111 pts 111
codec time 1 stream time 12288
pts 50176 dts 50176 duration 0
return EAGAIN
send unique 582 s_frame 112 pts 112
codec time 1 stream time 12288
pts 50688 dts 50688 duration 0
return EAGAIN
send unique 584 s_frame 113 pts 113
codec time 1 stream time 12288
pts 51200 dts 51200 duration 0
return EAGAIN
send unique 586 s_frame 114 pts 114
codec time 1 stream time 12288
pts 51712 dts 51712 duration 0
return EAGAIN
send unique 588 s_frame 115 pts 115
codec time 1 stream time 12288
pts 52224 dts 52224 duration 0
return EAGAIN
send unique 589 s_frame 116 pts 116
codec time 1 stream time 12288
pts 52736 dts 52736 duration 0
return EAGAIN
send unique 591 s_frame 117 pts 117
codec time 1 stream time 12288
pts 53248 dts 53248 duration 0
return EAGAIN
send unique 593 s_frame 118 pts 118
codec time 1 stream time 12288
pts 53760 dts 53760 duration 0
return EAGAIN
send unique 595 s_frame 119 pts 119
codec time 1 stream time 12288
pts 54272 dts 54272 duration 0
return EAGAIN
send unique 597 s_frame 120 pts 120
codec time 1 stream time 12288
pts 54784 dts 54784 duration 0
return EAGAIN
close
flushed codec
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