Hi all,
I have an issue with the first 12 images not being saved to file. I have
attached my code ( the relevant ones ) in this email, I have also attached a
log file to show that the first 12 images aren't written to the file that is
generated. The frame rate is 24 fps and the recording is 5 sec, so there should
be 120 frames written to the file. This can be seen in the 4th column. The
lines in the log files are as follows :
[cpp filename] : image num [ unique num from camera] [temp image num for
recording seq] [time in ms]
The image class is actually a simple wrapper around OpenCV's mat class with
some addition members. The output file is around 10 MB and when I open it in
VLC it doesn't run for 5 seconds but more like 1 - 2 seconds. Can anyone
explain the files not written and the duration not being 5 secs. As you can see
I have tried with "av_interleaved_write_frame" but that didn't help
#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#ifndef XCODEC_CPP
#define XCODEC_CPP
#include "XCodec.h"
#include <QDebug>
#define STREAM_DURATION 5.0
#define STREAM_FRAME_RATE 24
#define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */
#define OUTPUT_CODEC AV_CODEC_ID_H264
int XCodec::s_frameCount = 0;
XCodec::XCodec( 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, NULL,
m_filename.c_str());
if (!m_formatCtx)
return;
m_outputFormat = m_formatCtx->oformat;
// Add the video stream using H264 codec
add_stream();
// Open video codec and allocate the necessary encode buffers
if (m_streamOut)
openVideoCodec();
// Print detailed information about input and output
av_dump_format( m_formatCtx, 0, m_filename.c_str(), 1);
// 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);
if (ret < 0)
{
char error[255];
ret = av_strerror( ret, error, 255);
fprintf(stderr, "Could not open '%s': %s\n", m_filename.c_str(),
error);
return ;
}
}
else
{
return;
}
// Write media header
ret = avformat_write_header( m_formatCtx, NULL );
if (ret < 0)
{
char error[255];
av_strerror(ret, error, 255);
fprintf(stderr, "Error occurred when opening output file: %s\n", error);
return;
}
if ( m_frame )
m_frame->pts = 0;
}
XCodec::~XCodec()
{}
/* Add an output stream. */
void XCodec::add_stream()
{
AVCodecID codecId = OUTPUT_CODEC;
if (!( m_encoder ))
{
fprintf(stderr, "Could not find encoder for '%s'\n",
avcodec_get_name(codecId));
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;
m_codecCtx = avcodec_alloc_context3( m_encoder);
switch (( m_encoder)->type)
{
case AVMEDIA_TYPE_VIDEO:
m_streamOut->codecpar->codec_id = codecId;
m_streamOut->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
m_streamOut->codecpar->bit_rate = 400000;
m_streamOut->codecpar->width = 800;
m_streamOut->codecpar->height = 640;
m_streamOut->codecpar->format = STREAM_PIX_FMT;
m_streamOut->time_base = { 1, STREAM_FRAME_RATE };
avcodec_parameters_to_context( m_codecCtx, m_streamOut->codecpar);
m_codecCtx->gop_size = 12; /* emit one intra frame every twelve frames
at most */
m_codecCtx->max_b_frames = 1;
m_codecCtx->time_base = { 1, STREAM_FRAME_RATE };
m_codecCtx->framerate = { STREAM_FRAME_RATE, 1 };
m_codecCtx->pix_fmt = STREAM_PIX_FMT;
m_codecCtx->profile = FF_PROFILE_H264_HIGH;
break;
default:
break;
}
if (m_streamOut->codecpar->codec_id == OUTPUT_CODEC)
{
av_opt_set( m_codecCtx, "preset", "ultrafast", 0 );
}
/
// /* Some formats want stream headers to be separate. */
if (m_formatCtx->oformat->flags & AVFMT_GLOBALHEADER)
m_codecCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
int ret = avcodec_parameters_from_context( m_streamOut->codecpar,
m_codecCtx );
if (ret < 0)
{
char error[255];
av_strerror(ret, error, 255);
fprintf(stderr, "avcodec_parameters_from_context returned (%d) - %s",
ret, error);
return;
}
}
void XCodec::openVideoCodec()
{
int ret;
/* open the codec */
ret = avcodec_open2(m_codecCtx, m_encoder, NULL);
if (ret < 0)
{
char error[255];
av_strerror(ret, error, 255);
fprintf(stderr, "Could not open video codec: %s\n", error);
return;
}
/* allocate and init a re-usable frame */
// m_frame = av_frame_alloc();
}
void XCodec::encodeImage(const Image &image)
{
// Compute video time from last added video frame
m_timeVideo = image.timeStamp(); //(double)m_frame->pts) *
av_q2d(m_streamOut->time_base);
// Stop media if enough time
if (!m_streamOut /*|| m_timeVideo >= STREAM_DURATION*/)
return;
// Add a video frame
write_video_frame( image );
}
void XCodec::write_video_frame( const Image& image )
{
int ret;
qDebug() << "image num " << image.uniqueImageNumber() << " " << s_frameCount;
if ( s_frameCount >= STREAM_NB_FRAMES)
{
/* No more frames to compress. The codec has a latency of a few
* frames if using B-frames, so we get the last frames by
* passing the same picture again. */
int p( 0 ) ;
}
else
{
createFrame( image );
}
// Increase frame pts according to time base
// m_frame->pts += av_rescale_q(1, m_codecCtx->time_base,
m_streamOut->time_base);
m_frame->pts = int64_t( image.timeStamp()) ;
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 = m_frame->data[0];
pkt.size = sizeof(AVPicture);
// ret = av_interleaved_write_frame(m_formatCtx, &pkt);
ret = av_write_frame( m_formatCtx, &pkt );
}
else
{
AVPacket pkt;
av_init_packet(&pkt);
/* encode the image */
ret = avcodec_send_frame(m_codecCtx, m_frame);
if (ret < 0)
{
char error[255];
av_strerror(ret, error, 255);
fprintf(stderr, "Error encoding video frame: %s\n", error);
return;
}
/* If size is zero, it means the image was buffered. */
ret = avcodec_receive_packet(m_codecCtx, &pkt);
if( !ret && pkt.size)
{
qDebug() << "write frame " << m_frame->display_picture_number;
pkt.stream_index = m_streamOut->index;
/* Write the compressed frame to the media file. */
// ret = av_interleaved_write_frame(m_formatCtx, &pkt);
ret = av_write_frame( m_formatCtx, &pkt );
}
else
{
ret = 0;
}
}
if (ret != 0)
{
char error[255];
av_strerror(ret, error, 255);
fprintf(stderr, "Error while writing video frame: %s\n", error);
return;
}
s_frameCount++;
}
void XCodec::createFrame( const Image& image /*, AVFrame *m_frame, int
frame_index, int width, int height*/)
{
/**
* \note allocate frame
*/
m_frame = av_frame_alloc();
int ret = av_frame_make_writable( m_frame );
m_frame->format = STREAM_PIX_FMT;
m_frame->width = image.width();
m_frame->height = image.height();
// m_frame->pict_type = AV_PICTURE_TYPE_I;
m_frame->display_picture_number = image.uniqueImageNumber();
ret = av_image_alloc(m_frame->data, m_frame->linesize, m_frame->width,
m_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_RGB24,
(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(), m_frame->data,
m_frame->linesize);
//cv::Mat yuv420p( m_frame->height + m_frame->height/2, m_frame->width,
CV_8UC1, m_frame->data[0]);
//cv::Mat cvmIm;
//cv::cvtColor(yuv420p,cvmIm,CV_YUV420p2BGR);
//std::ostringstream ss;
//ss << "c:\\tmp\\YUVoriginal_" << image.uniqueImageNumber() << ".png";
//cv::imwrite( ss.str().c_str(), cvmIm);
}
void XCodec::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 each codec. */
if ( m_streamOut )
{
if( m_frame )
{
av_free( m_frame->data[0]);
av_frame_free( &m_frame );
}
if( m_packet )
av_packet_free( &m_packet );
}
if (!( m_outputFormat->flags & AVFMT_NOFILE))
/* Close the output file. */
ret = avio_close( m_formatCtx->pb);
/* free the stream */
avformat_free_context( m_formatCtx );
fflush( stdout );
}
#endif // XCodec_CPP
#ifndef XCodec_H
#define XCodec_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 XCodec
{
public:
XCodec(const char *filename);
~XCodec();
void encodeImage( const Image& image );
void encode( AVFrame *frame, AVPacket *pkt );
void add_stream();
void openVideoCodec();
void write_video_frame(const Image &image);
void createFrame( const Image& image );
void close();
private:
static int s_frameCount;
int m_timeVideo = 0;
std::string m_filename;
AVCodec* m_encoder = NULL;
AVOutputFormat* m_outputFormat = NULL;
AVFormatContext* m_formatCtx = NULL;
AVCodecContext* m_codecCtx = NULL;
AVStream* m_streamOut = NULL;
AVFrame* m_frame = NULL;
AVPacket* m_packet = NULL;
};
#endifacquisition\xcodec.cpp(216): image num 1725 0 0
acquisition\xcodec.cpp(216): image num 1727 1 40
acquisition\xcodec.cpp(216): image num 1729 2 84
acquisition\xcodec.cpp(216): image num 1730 3 126
acquisition\xcodec.cpp(216): image num 1732 4 169
acquisition\xcodec.cpp(216): image num 1734 5 211
acquisition\xcodec.cpp(216): image num 1736 6 259
acquisition\xcodec.cpp(216): image num 1738 7 297
acquisition\xcodec.cpp(216): image num 1740 8 340
acquisition\xcodec.cpp(216): image num 1742 9 383
acquisition\xcodec.cpp(216): image num 1744 10 425
acquisition\xcodec.cpp(216): image num 1746 11 467
acquisition\xcodec.cpp(216): image num 1748 12 511
acquisition\xcodec.cpp(216): image num 1750 13 553
acquisition\xcodec.cpp(253): write frame 1750
acquisition\xcodec.cpp(216): image num 1752 14 600
acquisition\xcodec.cpp(253): write frame 1752
acquisition\xcodec.cpp(216): image num 1753 15 637
acquisition\xcodec.cpp(253): write frame 1753
acquisition\xcodec.cpp(216): image num 1755 16 680
acquisition\xcodec.cpp(253): write frame 1755
acquisition\xcodec.cpp(216): image num 1757 17 723
acquisition\xcodec.cpp(253): write frame 1757
acquisition\xcodec.cpp(216): image num 1759 18 766
acquisition\xcodec.cpp(253): write frame 1759
acquisition\xcodec.cpp(216): image num 1761 19 808
acquisition\xcodec.cpp(253): write frame 1761
acquisition\xcodec.cpp(216): image num 1763 20 854
acquisition\xcodec.cpp(253): write frame 1763
acquisition\xcodec.cpp(216): image num 1765 21 893
acquisition\xcodec.cpp(253): write frame 1765
acquisition\xcodec.cpp(216): image num 1767 22 937
acquisition\xcodec.cpp(253): write frame 1767
acquisition\xcodec.cpp(216): image num 1769 23 979
acquisition\xcodec.cpp(253): write frame 1769
acquisition\xcodec.cpp(216): image num 1770 24 1022
acquisition\xcodec.cpp(253): write frame 1770
acquisition\xcodec.cpp(216): image num 1772 25 1064
acquisition\xcodec.cpp(253): write frame 1772
acquisition\xcodec.cpp(216): image num 1774 26 1108
acquisition\xcodec.cpp(253): write frame 1774
acquisition\xcodec.cpp(216): image num 1776 27 1150
acquisition\xcodec.cpp(253): write frame 1776
acquisition\xcodec.cpp(216): image num 1778 28 1192
acquisition\xcodec.cpp(253): write frame 1778
acquisition\xcodec.cpp(216): image num 1780 29 1235
acquisition\xcodec.cpp(253): write frame 1780
acquisition\xcodec.cpp(216): image num 1782 30 1277
acquisition\xcodec.cpp(253): write frame 1782
acquisition\xcodec.cpp(216): image num 1784 31 1320
acquisition\xcodec.cpp(253): write frame 1784
acquisition\xcodec.cpp(216): image num 1786 32 1362
acquisition\xcodec.cpp(253): write frame 1786
acquisition\xcodec.cpp(216): image num 1787 33 1405
acquisition\xcodec.cpp(253): write frame 1787
acquisition\xcodec.cpp(216): image num 1789 34 1450
acquisition\xcodec.cpp(253): write frame 1789
acquisition\xcodec.cpp(216): image num 1791 35 1493
acquisition\xcodec.cpp(253): write frame 1791
acquisition\xcodec.cpp(216): image num 1793 36 1536
acquisition\xcodec.cpp(253): write frame 1793
acquisition\xcodec.cpp(216): image num 1795 37 1578
acquisition\xcodec.cpp(253): write frame 1795
acquisition\xcodec.cpp(216): image num 1797 38 1621
acquisition\xcodec.cpp(253): write frame 1797
acquisition\xcodec.cpp(216): image num 1799 39 1663
acquisition\xcodec.cpp(253): write frame 1799
acquisition\xcodec.cpp(216): image num 1801 40 1709
acquisition\xcodec.cpp(253): write frame 1801
acquisition\xcodec.cpp(216): image num 1803 41 1748
acquisition\xcodec.cpp(253): write frame 1803
acquisition\xcodec.cpp(216): image num 1805 42 1791
acquisition\xcodec.cpp(253): write frame 1805
acquisition\xcodec.cpp(216): image num 1807 43 1833
acquisition\xcodec.cpp(253): write frame 1807
acquisition\xcodec.cpp(216): image num 1808 44 1876
acquisition\xcodec.cpp(253): write frame 1808
acquisition\xcodec.cpp(216): image num 1810 45 1920
acquisition\xcodec.cpp(253): write frame 1810
acquisition\xcodec.cpp(216): image num 1812 46 1962
acquisition\xcodec.cpp(253): write frame 1812
acquisition\xcodec.cpp(216): image num 1814 47 2004
acquisition\xcodec.cpp(253): write frame 1814
acquisition\xcodec.cpp(216): image num 1816 48 2048
acquisition\xcodec.cpp(253): write frame 1816
acquisition\xcodec.cpp(216): image num 1818 49 2092
acquisition\xcodec.cpp(253): write frame 1818
acquisition\xcodec.cpp(216): image num 1820 50 2133
acquisition\xcodec.cpp(253): write frame 1820
acquisition\xcodec.cpp(216): image num 1822 51 2175
acquisition\xcodec.cpp(253): write frame 1822
acquisition\xcodec.cpp(216): image num 1824 52 2221
acquisition\xcodec.cpp(253): write frame 1824
acquisition\xcodec.cpp(216): image num 1826 53 2277
acquisition\xcodec.cpp(253): write frame 1826
acquisition\xcodec.cpp(216): image num 1828 54 2319
acquisition\xcodec.cpp(253): write frame 1828
acquisition\xcodec.cpp(216): image num 1830 55 2361
acquisition\xcodec.cpp(253): write frame 1830
acquisition\xcodec.cpp(216): image num 1832 56 2405
acquisition\xcodec.cpp(253): write frame 1832
acquisition\xcodec.cpp(216): image num 1833 57 2447
acquisition\xcodec.cpp(253): write frame 1833
acquisition\xcodec.cpp(216): image num 1835 58 2491
acquisition\xcodec.cpp(253): write frame 1835
acquisition\xcodec.cpp(216): image num 1837 59 2533
acquisition\xcodec.cpp(253): write frame 1837
acquisition\xcodec.cpp(216): image num 1839 60 2576
acquisition\xcodec.cpp(253): write frame 1839
acquisition\xcodec.cpp(216): image num 1841 61 2619
acquisition\xcodec.cpp(253): write frame 1841
acquisition\xcodec.cpp(216): image num 1843 62 2662
acquisition\xcodec.cpp(253): write frame 1843
acquisition\xcodec.cpp(216): image num 1845 63 2704
acquisition\xcodec.cpp(253): write frame 1845
acquisition\xcodec.cpp(216): image num 1847 64 2746
acquisition\xcodec.cpp(253): write frame 1847
acquisition\xcodec.cpp(216): image num 1849 65 2789
acquisition\xcodec.cpp(253): write frame 1849
acquisition\xcodec.cpp(216): image num 1851 66 2831
acquisition\xcodec.cpp(253): write frame 1851
acquisition\xcodec.cpp(216): image num 1852 67 2874
acquisition\xcodec.cpp(253): write frame 1852
acquisition\xcodec.cpp(216): image num 1854 68 2917
acquisition\xcodec.cpp(253): write frame 1854
acquisition\xcodec.cpp(216): image num 1856 69 2959
acquisition\xcodec.cpp(253): write frame 1856
acquisition\xcodec.cpp(216): image num 1858 70 3003
acquisition\xcodec.cpp(253): write frame 1858
acquisition\xcodec.cpp(216): image num 1860 71 3045
acquisition\xcodec.cpp(253): write frame 1860
acquisition\xcodec.cpp(216): image num 1862 72 3088
acquisition\xcodec.cpp(253): write frame 1862
acquisition\xcodec.cpp(216): image num 1864 73 3130
acquisition\xcodec.cpp(253): write frame 1864
acquisition\xcodec.cpp(216): image num 1866 74 3173
acquisition\xcodec.cpp(253): write frame 1866
acquisition\xcodec.cpp(216): image num 1868 75 3215
acquisition\xcodec.cpp(253): write frame 1868
acquisition\xcodec.cpp(216): image num 1870 76 3257
acquisition\xcodec.cpp(253): write frame 1870
acquisition\xcodec.cpp(216): image num 1872 77 3306
acquisition\xcodec.cpp(253): write frame 1872
acquisition\xcodec.cpp(216): image num 1873 78 3347
acquisition\xcodec.cpp(253): write frame 1873
acquisition\xcodec.cpp(216): image num 1875 79 3389
acquisition\xcodec.cpp(253): write frame 1875
acquisition\xcodec.cpp(216): image num 1877 80 3433
acquisition\xcodec.cpp(253): write frame 1877
acquisition\xcodec.cpp(216): image num 1879 81 3475
acquisition\xcodec.cpp(253): write frame 1879
acquisition\xcodec.cpp(216): image num 1883 82 3562
acquisition\xcodec.cpp(253): write frame 1883
acquisition\xcodec.cpp(216): image num 1885 83 3603
acquisition\xcodec.cpp(253): write frame 1885
acquisition\xcodec.cpp(216): image num 1887 84 3660
acquisition\xcodec.cpp(253): write frame 1887
acquisition\xcodec.cpp(216): image num 1889 85 3704
acquisition\xcodec.cpp(253): write frame 1889
acquisition\xcodec.cpp(216): image num 1891 86 3747
acquisition\xcodec.cpp(253): write frame 1891
acquisition\xcodec.cpp(216): image num 1893 87 3789
acquisition\xcodec.cpp(253): write frame 1893
acquisition\xcodec.cpp(216): image num 1895 88 3832
acquisition\xcodec.cpp(253): write frame 1895
acquisition\xcodec.cpp(216): image num 1897 89 3874
acquisition\xcodec.cpp(253): write frame 1897
acquisition\xcodec.cpp(216): image num 1899 90 3917
acquisition\xcodec.cpp(253): write frame 1899
acquisition\xcodec.cpp(216): image num 1900 91 3959
acquisition\xcodec.cpp(253): write frame 1900
acquisition\xcodec.cpp(216): image num 1902 92 4001
acquisition\xcodec.cpp(253): write frame 1902
acquisition\xcodec.cpp(216): image num 1904 93 4044
acquisition\xcodec.cpp(253): write frame 1904
acquisition\xcodec.cpp(216): image num 1906 94 4086
acquisition\xcodec.cpp(253): write frame 1906
acquisition\xcodec.cpp(216): image num 1908 95 4130
acquisition\xcodec.cpp(253): write frame 1908
acquisition\xcodec.cpp(216): image num 1910 96 4174
acquisition\xcodec.cpp(253): write frame 1910
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acquisition\xcodec.cpp(253): write frame 1926
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acquisition\xcodec.cpp(253): write frame 1927
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acquisition\xcodec.cpp(253): write frame 1931
acquisition\xcodec.cpp(216): image num 1933 107 4707
acquisition\xcodec.cpp(253): write frame 1933
acquisition\xcodec.cpp(216): image num 1935 108 4750
acquisition\xcodec.cpp(253): write frame 1935
acquisition\xcodec.cpp(216): image num 1937 109 4794
acquisition\xcodec.cpp(253): write frame 1937
acquisition\xcodec.cpp(216): image num 1939 110 4836
acquisition\xcodec.cpp(253): write frame 1939
acquisition\xcodec.cpp(216): image num 1941 111 4879
acquisition\xcodec.cpp(253): write frame 1941
acquisition\xcodec.cpp(216): image num 1943 112 4922
acquisition\xcodec.cpp(253): write frame 1943
acquisition\xcodec.cpp(216): image num 1945 113 4965
acquisition\xcodec.cpp(253): write frame 1945
acquisition\xcodec.cpp(216): image num 1947 114 5007
acquisition\xcodec.cpp(253): write frame 1947
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acquisition\xcodec.cpp(253): write frame 1948
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acquisition\xcodec.cpp(216): image num 1954 118 5178
acquisition\xcodec.cpp(253): write frame 1954
acquisition\xcodec.cpp(216): image num 1956 119 5221
acquisition\xcodec.cpp(253): write frame 1956
[libx264 @ b2a30c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
FMA3 BMI2 AVX2
[libx264 @ b2a30c00] profile High, level 3.1, 4:2:0, 8-bit
Not writing 'clli' atom. No content light level info.
Not writing 'mdcv' atom. Missing mastering metadata.
[AVIOContext @ b0db8d00] Statistics: 2 seeks, 41 writeouts
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