C++ ffmpeg library framerate incorrect when muxingcan i mux h264 stream into mp4(aac) through libavformat without libx264?Decode h264 rtsp with ffmpeg and separated AVCodecContextlibav/ffmpeg: avcodec_decode_video2() returns -1 when separating demultiplexing and decodingIs it possible to add audio at the end of an existing audio stream?FFMPEG libavformat internal bufferingSaving frames from a network camera (RTSP) to a mp4 fileConfusion about PTS in video files and media streamsusing FFMPEG for demux and decoding of mpeg2Ts streamFFMPEG amerge fails when one audio stream is missingReplacing av_read_frame() to reduce delay

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C++ ffmpeg library framerate incorrect when muxing


can i mux h264 stream into mp4(aac) through libavformat without libx264?Decode h264 rtsp with ffmpeg and separated AVCodecContextlibav/ffmpeg: avcodec_decode_video2() returns -1 when separating demultiplexing and decodingIs it possible to add audio at the end of an existing audio stream?FFMPEG libavformat internal bufferingSaving frames from a network camera (RTSP) to a mp4 fileConfusion about PTS in video files and media streamsusing FFMPEG for demux and decoding of mpeg2Ts streamFFMPEG amerge fails when one audio stream is missingReplacing av_read_frame() to reduce delay






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1















I am trying to create a function which will combine an audio file and a video file and output them to an mp4. I've managed to successfully do so except that the output is not at the correct framerate. It's a very slight difference from the original. 30.13 whereas it should be 30 exactly. When I combine these files with the ffmpeg program, the result is exactly 30 as it should be.



I'm confident it has something to do with the dts/pts correction when recieving out of order data, but ffmpeg program does this too in a similar manner. So I'm not sure where to go from here. I've looked at the ffmpeg source code and copied some of their dts correction and still no luck. What am I doing wrong here?



bool mux_audio_video(const char* audio_filename, const char* video_filename, const char* output_filename)
av_register_all();

AVOutputFormat* out_format = NULL;
AVFormatContext* audio_context = NULL, *video_context = NULL, *output_context = NULL;
int video_index_in = -1, audio_index_in = -1;
int video_index_out = -1, audio_index_out = -1;


if(avformat_open_input(&audio_context, audio_filename, 0, 0) < 0)
return false;
if(avformat_find_stream_info(audio_context, 0) < 0)
avformat_close_input(&audio_context);
return false;

if(avformat_open_input(&video_context, video_filename, 0, 0) < 0)
avformat_close_input(&audio_context);
return false;

if(avformat_find_stream_info(video_context, 0) < 0)
avformat_close_input(&audio_context);
avformat_close_input(&video_context);
return false;


if(avformat_alloc_output_context2(&output_context, av_guess_format("mp4", NULL, NULL), NULL, output_filename) < 0)
avformat_close_input(&audio_context);
avformat_close_input(&video_context);
return false;

out_format = output_context->oformat;

//find first audio stream in the audio file input
for(size_t i = 0;i < audio_context->nb_streams;++i)
if(audio_context->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
audio_index_in = i;

AVStream* in_stream = audio_context->streams[i];
AVCodec* codec = avcodec_find_encoder(in_stream->codecpar->codec_id);
AVCodecContext* tmp = avcodec_alloc_context3(codec);
avcodec_parameters_to_context(tmp, in_stream->codecpar);
AVStream* out_stream = avformat_new_stream(output_context, codec);
audio_index_out = out_stream->index;
if(output_context->oformat->flags & AVFMT_GLOBALHEADER)= AV_CODEC_FLAG_GLOBAL_HEADER;

tmp->codec_tag = 0;
avcodec_parameters_from_context(out_stream->codecpar, tmp);
avcodec_free_context(&tmp);

break;


//find first video stream in the video file input
for(size_t i = 0;i < video_context->nb_streams;++i)
if(video_context->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
video_index_in = i;

AVStream* in_stream = video_context->streams[i];
AVCodec* codec = avcodec_find_encoder(in_stream->codecpar->codec_id);
AVCodecContext* tmp = avcodec_alloc_context3(codec);
avcodec_parameters_to_context(tmp, in_stream->codecpar);
AVStream* out_stream = avformat_new_stream(output_context, codec);
video_index_out = out_stream->index;
if(output_context->oformat->flags & AVFMT_GLOBALHEADER)= AV_CODEC_FLAG_GLOBAL_HEADER;

tmp->codec_tag = 0;
avcodec_parameters_from_context(out_stream->codecpar, tmp);
avcodec_free_context(&tmp);

break;



//setup output
if(!(out_format->flags & AVFMT_NOFILE))
if(avio_open(&output_context->pb, output_filename, AVIO_FLAG_WRITE) < 0)
avformat_free_context(output_context);
avformat_close_input(&audio_context);
avformat_close_input(&video_context);
return false;


if(avformat_write_header(output_context, NULL) < 0)
if(!(out_format->flags & AVFMT_NOFILE))
avio_close(output_context->pb);

avformat_free_context(output_context);
avformat_close_input(&audio_context);
avformat_close_input(&video_context);
return false;


int64_t video_pts = 0, audio_pts = 0;
int64_t last_video_dts = 0, last_audio_dts = 0;

while(true)
AVPacket packet;
av_init_packet(&packet);
packet.data = NULL;
packet.size = 0;
int64_t* last_dts;
AVFormatContext* in_context;
int stream_index = 0;
AVStream* in_stream, *out_stream;

//Read in a frame from the next stream
if(av_compare_ts(video_pts, video_context->streams[video_index_in]->time_base,
audio_pts, audio_context->streams[audio_index_in]->time_base) <= 0)

//video
last_dts = &last_video_dts;
in_context = video_context;
stream_index = video_index_out;

if(av_read_frame(in_context, &packet) >= 0)
do
if(packet.stream_index == video_index_in)
video_pts = packet.pts;
break;

av_packet_unref(&packet);
while(av_read_frame(in_context, &packet) >= 0);
else
break;

else
//audio
last_dts = &last_audio_dts;
in_context = audio_context;
stream_index = audio_index_out;

if(av_read_frame(in_context, &packet) >= 0)
do
if(packet.stream_index == audio_index_in)
audio_pts = packet.pts;
break;

av_packet_unref(&packet);
while(av_read_frame(in_context, &packet) >= 0);
else
break;


in_stream = in_context->streams[packet.stream_index];
out_stream = output_context->streams[stream_index];

av_packet_rescale_ts(&packet, in_stream->time_base, out_stream->time_base);

//if dts is out of order, ffmpeg throws an error. So manually fix. Similar to what ffmpeg does in ffmpeg.c
if(packet.dts < (*last_dts + !(output_context->oformat->flags & AVFMT_TS_NONSTRICT)) && packet.dts != AV_NOPTS_VALUE && (*last_dts) != AV_NOPTS_VALUE)
int64_t next_dts = (*last_dts)+1;
if(packet.pts >= packet.dts && packet.pts != AV_NOPTS_VALUE)
packet.pts = FFMAX(packet.pts, next_dts);

if(packet.pts == AV_NOPTS_VALUE)
packet.pts = next_dts;

packet.dts = next_dts;

(*last_dts) = packet.dts;

packet.pos = -1;
packet.stream_index = stream_index;

//output packet
if(av_interleaved_write_frame(output_context, &packet) < 0)
break;

av_packet_unref(&packet);



av_write_trailer(output_context);

//cleanup
if(!(out_format->flags & AVFMT_NOFILE))
avio_close(output_context->pb);

avformat_free_context(output_context);
avformat_close_input(&audio_context);
avformat_close_input(&video_context);
return true;










share|improve this question






























    1















    I am trying to create a function which will combine an audio file and a video file and output them to an mp4. I've managed to successfully do so except that the output is not at the correct framerate. It's a very slight difference from the original. 30.13 whereas it should be 30 exactly. When I combine these files with the ffmpeg program, the result is exactly 30 as it should be.



    I'm confident it has something to do with the dts/pts correction when recieving out of order data, but ffmpeg program does this too in a similar manner. So I'm not sure where to go from here. I've looked at the ffmpeg source code and copied some of their dts correction and still no luck. What am I doing wrong here?



    bool mux_audio_video(const char* audio_filename, const char* video_filename, const char* output_filename)
    av_register_all();

    AVOutputFormat* out_format = NULL;
    AVFormatContext* audio_context = NULL, *video_context = NULL, *output_context = NULL;
    int video_index_in = -1, audio_index_in = -1;
    int video_index_out = -1, audio_index_out = -1;


    if(avformat_open_input(&audio_context, audio_filename, 0, 0) < 0)
    return false;
    if(avformat_find_stream_info(audio_context, 0) < 0)
    avformat_close_input(&audio_context);
    return false;

    if(avformat_open_input(&video_context, video_filename, 0, 0) < 0)
    avformat_close_input(&audio_context);
    return false;

    if(avformat_find_stream_info(video_context, 0) < 0)
    avformat_close_input(&audio_context);
    avformat_close_input(&video_context);
    return false;


    if(avformat_alloc_output_context2(&output_context, av_guess_format("mp4", NULL, NULL), NULL, output_filename) < 0)
    avformat_close_input(&audio_context);
    avformat_close_input(&video_context);
    return false;

    out_format = output_context->oformat;

    //find first audio stream in the audio file input
    for(size_t i = 0;i < audio_context->nb_streams;++i)
    if(audio_context->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
    audio_index_in = i;

    AVStream* in_stream = audio_context->streams[i];
    AVCodec* codec = avcodec_find_encoder(in_stream->codecpar->codec_id);
    AVCodecContext* tmp = avcodec_alloc_context3(codec);
    avcodec_parameters_to_context(tmp, in_stream->codecpar);
    AVStream* out_stream = avformat_new_stream(output_context, codec);
    audio_index_out = out_stream->index;
    if(output_context->oformat->flags & AVFMT_GLOBALHEADER)= AV_CODEC_FLAG_GLOBAL_HEADER;

    tmp->codec_tag = 0;
    avcodec_parameters_from_context(out_stream->codecpar, tmp);
    avcodec_free_context(&tmp);

    break;


    //find first video stream in the video file input
    for(size_t i = 0;i < video_context->nb_streams;++i)
    if(video_context->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
    video_index_in = i;

    AVStream* in_stream = video_context->streams[i];
    AVCodec* codec = avcodec_find_encoder(in_stream->codecpar->codec_id);
    AVCodecContext* tmp = avcodec_alloc_context3(codec);
    avcodec_parameters_to_context(tmp, in_stream->codecpar);
    AVStream* out_stream = avformat_new_stream(output_context, codec);
    video_index_out = out_stream->index;
    if(output_context->oformat->flags & AVFMT_GLOBALHEADER)= AV_CODEC_FLAG_GLOBAL_HEADER;

    tmp->codec_tag = 0;
    avcodec_parameters_from_context(out_stream->codecpar, tmp);
    avcodec_free_context(&tmp);

    break;



    //setup output
    if(!(out_format->flags & AVFMT_NOFILE))
    if(avio_open(&output_context->pb, output_filename, AVIO_FLAG_WRITE) < 0)
    avformat_free_context(output_context);
    avformat_close_input(&audio_context);
    avformat_close_input(&video_context);
    return false;


    if(avformat_write_header(output_context, NULL) < 0)
    if(!(out_format->flags & AVFMT_NOFILE))
    avio_close(output_context->pb);

    avformat_free_context(output_context);
    avformat_close_input(&audio_context);
    avformat_close_input(&video_context);
    return false;


    int64_t video_pts = 0, audio_pts = 0;
    int64_t last_video_dts = 0, last_audio_dts = 0;

    while(true)
    AVPacket packet;
    av_init_packet(&packet);
    packet.data = NULL;
    packet.size = 0;
    int64_t* last_dts;
    AVFormatContext* in_context;
    int stream_index = 0;
    AVStream* in_stream, *out_stream;

    //Read in a frame from the next stream
    if(av_compare_ts(video_pts, video_context->streams[video_index_in]->time_base,
    audio_pts, audio_context->streams[audio_index_in]->time_base) <= 0)

    //video
    last_dts = &last_video_dts;
    in_context = video_context;
    stream_index = video_index_out;

    if(av_read_frame(in_context, &packet) >= 0)
    do
    if(packet.stream_index == video_index_in)
    video_pts = packet.pts;
    break;

    av_packet_unref(&packet);
    while(av_read_frame(in_context, &packet) >= 0);
    else
    break;

    else
    //audio
    last_dts = &last_audio_dts;
    in_context = audio_context;
    stream_index = audio_index_out;

    if(av_read_frame(in_context, &packet) >= 0)
    do
    if(packet.stream_index == audio_index_in)
    audio_pts = packet.pts;
    break;

    av_packet_unref(&packet);
    while(av_read_frame(in_context, &packet) >= 0);
    else
    break;


    in_stream = in_context->streams[packet.stream_index];
    out_stream = output_context->streams[stream_index];

    av_packet_rescale_ts(&packet, in_stream->time_base, out_stream->time_base);

    //if dts is out of order, ffmpeg throws an error. So manually fix. Similar to what ffmpeg does in ffmpeg.c
    if(packet.dts < (*last_dts + !(output_context->oformat->flags & AVFMT_TS_NONSTRICT)) && packet.dts != AV_NOPTS_VALUE && (*last_dts) != AV_NOPTS_VALUE)
    int64_t next_dts = (*last_dts)+1;
    if(packet.pts >= packet.dts && packet.pts != AV_NOPTS_VALUE)
    packet.pts = FFMAX(packet.pts, next_dts);

    if(packet.pts == AV_NOPTS_VALUE)
    packet.pts = next_dts;

    packet.dts = next_dts;

    (*last_dts) = packet.dts;

    packet.pos = -1;
    packet.stream_index = stream_index;

    //output packet
    if(av_interleaved_write_frame(output_context, &packet) < 0)
    break;

    av_packet_unref(&packet);



    av_write_trailer(output_context);

    //cleanup
    if(!(out_format->flags & AVFMT_NOFILE))
    avio_close(output_context->pb);

    avformat_free_context(output_context);
    avformat_close_input(&audio_context);
    avformat_close_input(&video_context);
    return true;










    share|improve this question


























      1












      1








      1








      I am trying to create a function which will combine an audio file and a video file and output them to an mp4. I've managed to successfully do so except that the output is not at the correct framerate. It's a very slight difference from the original. 30.13 whereas it should be 30 exactly. When I combine these files with the ffmpeg program, the result is exactly 30 as it should be.



      I'm confident it has something to do with the dts/pts correction when recieving out of order data, but ffmpeg program does this too in a similar manner. So I'm not sure where to go from here. I've looked at the ffmpeg source code and copied some of their dts correction and still no luck. What am I doing wrong here?



      bool mux_audio_video(const char* audio_filename, const char* video_filename, const char* output_filename)
      av_register_all();

      AVOutputFormat* out_format = NULL;
      AVFormatContext* audio_context = NULL, *video_context = NULL, *output_context = NULL;
      int video_index_in = -1, audio_index_in = -1;
      int video_index_out = -1, audio_index_out = -1;


      if(avformat_open_input(&audio_context, audio_filename, 0, 0) < 0)
      return false;
      if(avformat_find_stream_info(audio_context, 0) < 0)
      avformat_close_input(&audio_context);
      return false;

      if(avformat_open_input(&video_context, video_filename, 0, 0) < 0)
      avformat_close_input(&audio_context);
      return false;

      if(avformat_find_stream_info(video_context, 0) < 0)
      avformat_close_input(&audio_context);
      avformat_close_input(&video_context);
      return false;


      if(avformat_alloc_output_context2(&output_context, av_guess_format("mp4", NULL, NULL), NULL, output_filename) < 0)
      avformat_close_input(&audio_context);
      avformat_close_input(&video_context);
      return false;

      out_format = output_context->oformat;

      //find first audio stream in the audio file input
      for(size_t i = 0;i < audio_context->nb_streams;++i)
      if(audio_context->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
      audio_index_in = i;

      AVStream* in_stream = audio_context->streams[i];
      AVCodec* codec = avcodec_find_encoder(in_stream->codecpar->codec_id);
      AVCodecContext* tmp = avcodec_alloc_context3(codec);
      avcodec_parameters_to_context(tmp, in_stream->codecpar);
      AVStream* out_stream = avformat_new_stream(output_context, codec);
      audio_index_out = out_stream->index;
      if(output_context->oformat->flags & AVFMT_GLOBALHEADER)= AV_CODEC_FLAG_GLOBAL_HEADER;

      tmp->codec_tag = 0;
      avcodec_parameters_from_context(out_stream->codecpar, tmp);
      avcodec_free_context(&tmp);

      break;


      //find first video stream in the video file input
      for(size_t i = 0;i < video_context->nb_streams;++i)
      if(video_context->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
      video_index_in = i;

      AVStream* in_stream = video_context->streams[i];
      AVCodec* codec = avcodec_find_encoder(in_stream->codecpar->codec_id);
      AVCodecContext* tmp = avcodec_alloc_context3(codec);
      avcodec_parameters_to_context(tmp, in_stream->codecpar);
      AVStream* out_stream = avformat_new_stream(output_context, codec);
      video_index_out = out_stream->index;
      if(output_context->oformat->flags & AVFMT_GLOBALHEADER)= AV_CODEC_FLAG_GLOBAL_HEADER;

      tmp->codec_tag = 0;
      avcodec_parameters_from_context(out_stream->codecpar, tmp);
      avcodec_free_context(&tmp);

      break;



      //setup output
      if(!(out_format->flags & AVFMT_NOFILE))
      if(avio_open(&output_context->pb, output_filename, AVIO_FLAG_WRITE) < 0)
      avformat_free_context(output_context);
      avformat_close_input(&audio_context);
      avformat_close_input(&video_context);
      return false;


      if(avformat_write_header(output_context, NULL) < 0)
      if(!(out_format->flags & AVFMT_NOFILE))
      avio_close(output_context->pb);

      avformat_free_context(output_context);
      avformat_close_input(&audio_context);
      avformat_close_input(&video_context);
      return false;


      int64_t video_pts = 0, audio_pts = 0;
      int64_t last_video_dts = 0, last_audio_dts = 0;

      while(true)
      AVPacket packet;
      av_init_packet(&packet);
      packet.data = NULL;
      packet.size = 0;
      int64_t* last_dts;
      AVFormatContext* in_context;
      int stream_index = 0;
      AVStream* in_stream, *out_stream;

      //Read in a frame from the next stream
      if(av_compare_ts(video_pts, video_context->streams[video_index_in]->time_base,
      audio_pts, audio_context->streams[audio_index_in]->time_base) <= 0)

      //video
      last_dts = &last_video_dts;
      in_context = video_context;
      stream_index = video_index_out;

      if(av_read_frame(in_context, &packet) >= 0)
      do
      if(packet.stream_index == video_index_in)
      video_pts = packet.pts;
      break;

      av_packet_unref(&packet);
      while(av_read_frame(in_context, &packet) >= 0);
      else
      break;

      else
      //audio
      last_dts = &last_audio_dts;
      in_context = audio_context;
      stream_index = audio_index_out;

      if(av_read_frame(in_context, &packet) >= 0)
      do
      if(packet.stream_index == audio_index_in)
      audio_pts = packet.pts;
      break;

      av_packet_unref(&packet);
      while(av_read_frame(in_context, &packet) >= 0);
      else
      break;


      in_stream = in_context->streams[packet.stream_index];
      out_stream = output_context->streams[stream_index];

      av_packet_rescale_ts(&packet, in_stream->time_base, out_stream->time_base);

      //if dts is out of order, ffmpeg throws an error. So manually fix. Similar to what ffmpeg does in ffmpeg.c
      if(packet.dts < (*last_dts + !(output_context->oformat->flags & AVFMT_TS_NONSTRICT)) && packet.dts != AV_NOPTS_VALUE && (*last_dts) != AV_NOPTS_VALUE)
      int64_t next_dts = (*last_dts)+1;
      if(packet.pts >= packet.dts && packet.pts != AV_NOPTS_VALUE)
      packet.pts = FFMAX(packet.pts, next_dts);

      if(packet.pts == AV_NOPTS_VALUE)
      packet.pts = next_dts;

      packet.dts = next_dts;

      (*last_dts) = packet.dts;

      packet.pos = -1;
      packet.stream_index = stream_index;

      //output packet
      if(av_interleaved_write_frame(output_context, &packet) < 0)
      break;

      av_packet_unref(&packet);



      av_write_trailer(output_context);

      //cleanup
      if(!(out_format->flags & AVFMT_NOFILE))
      avio_close(output_context->pb);

      avformat_free_context(output_context);
      avformat_close_input(&audio_context);
      avformat_close_input(&video_context);
      return true;










      share|improve this question
















      I am trying to create a function which will combine an audio file and a video file and output them to an mp4. I've managed to successfully do so except that the output is not at the correct framerate. It's a very slight difference from the original. 30.13 whereas it should be 30 exactly. When I combine these files with the ffmpeg program, the result is exactly 30 as it should be.



      I'm confident it has something to do with the dts/pts correction when recieving out of order data, but ffmpeg program does this too in a similar manner. So I'm not sure where to go from here. I've looked at the ffmpeg source code and copied some of their dts correction and still no luck. What am I doing wrong here?



      bool mux_audio_video(const char* audio_filename, const char* video_filename, const char* output_filename)
      av_register_all();

      AVOutputFormat* out_format = NULL;
      AVFormatContext* audio_context = NULL, *video_context = NULL, *output_context = NULL;
      int video_index_in = -1, audio_index_in = -1;
      int video_index_out = -1, audio_index_out = -1;


      if(avformat_open_input(&audio_context, audio_filename, 0, 0) < 0)
      return false;
      if(avformat_find_stream_info(audio_context, 0) < 0)
      avformat_close_input(&audio_context);
      return false;

      if(avformat_open_input(&video_context, video_filename, 0, 0) < 0)
      avformat_close_input(&audio_context);
      return false;

      if(avformat_find_stream_info(video_context, 0) < 0)
      avformat_close_input(&audio_context);
      avformat_close_input(&video_context);
      return false;


      if(avformat_alloc_output_context2(&output_context, av_guess_format("mp4", NULL, NULL), NULL, output_filename) < 0)
      avformat_close_input(&audio_context);
      avformat_close_input(&video_context);
      return false;

      out_format = output_context->oformat;

      //find first audio stream in the audio file input
      for(size_t i = 0;i < audio_context->nb_streams;++i)
      if(audio_context->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
      audio_index_in = i;

      AVStream* in_stream = audio_context->streams[i];
      AVCodec* codec = avcodec_find_encoder(in_stream->codecpar->codec_id);
      AVCodecContext* tmp = avcodec_alloc_context3(codec);
      avcodec_parameters_to_context(tmp, in_stream->codecpar);
      AVStream* out_stream = avformat_new_stream(output_context, codec);
      audio_index_out = out_stream->index;
      if(output_context->oformat->flags & AVFMT_GLOBALHEADER)= AV_CODEC_FLAG_GLOBAL_HEADER;

      tmp->codec_tag = 0;
      avcodec_parameters_from_context(out_stream->codecpar, tmp);
      avcodec_free_context(&tmp);

      break;


      //find first video stream in the video file input
      for(size_t i = 0;i < video_context->nb_streams;++i)
      if(video_context->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
      video_index_in = i;

      AVStream* in_stream = video_context->streams[i];
      AVCodec* codec = avcodec_find_encoder(in_stream->codecpar->codec_id);
      AVCodecContext* tmp = avcodec_alloc_context3(codec);
      avcodec_parameters_to_context(tmp, in_stream->codecpar);
      AVStream* out_stream = avformat_new_stream(output_context, codec);
      video_index_out = out_stream->index;
      if(output_context->oformat->flags & AVFMT_GLOBALHEADER)= AV_CODEC_FLAG_GLOBAL_HEADER;

      tmp->codec_tag = 0;
      avcodec_parameters_from_context(out_stream->codecpar, tmp);
      avcodec_free_context(&tmp);

      break;



      //setup output
      if(!(out_format->flags & AVFMT_NOFILE))
      if(avio_open(&output_context->pb, output_filename, AVIO_FLAG_WRITE) < 0)
      avformat_free_context(output_context);
      avformat_close_input(&audio_context);
      avformat_close_input(&video_context);
      return false;


      if(avformat_write_header(output_context, NULL) < 0)
      if(!(out_format->flags & AVFMT_NOFILE))
      avio_close(output_context->pb);

      avformat_free_context(output_context);
      avformat_close_input(&audio_context);
      avformat_close_input(&video_context);
      return false;


      int64_t video_pts = 0, audio_pts = 0;
      int64_t last_video_dts = 0, last_audio_dts = 0;

      while(true)
      AVPacket packet;
      av_init_packet(&packet);
      packet.data = NULL;
      packet.size = 0;
      int64_t* last_dts;
      AVFormatContext* in_context;
      int stream_index = 0;
      AVStream* in_stream, *out_stream;

      //Read in a frame from the next stream
      if(av_compare_ts(video_pts, video_context->streams[video_index_in]->time_base,
      audio_pts, audio_context->streams[audio_index_in]->time_base) <= 0)

      //video
      last_dts = &last_video_dts;
      in_context = video_context;
      stream_index = video_index_out;

      if(av_read_frame(in_context, &packet) >= 0)
      do
      if(packet.stream_index == video_index_in)
      video_pts = packet.pts;
      break;

      av_packet_unref(&packet);
      while(av_read_frame(in_context, &packet) >= 0);
      else
      break;

      else
      //audio
      last_dts = &last_audio_dts;
      in_context = audio_context;
      stream_index = audio_index_out;

      if(av_read_frame(in_context, &packet) >= 0)
      do
      if(packet.stream_index == audio_index_in)
      audio_pts = packet.pts;
      break;

      av_packet_unref(&packet);
      while(av_read_frame(in_context, &packet) >= 0);
      else
      break;


      in_stream = in_context->streams[packet.stream_index];
      out_stream = output_context->streams[stream_index];

      av_packet_rescale_ts(&packet, in_stream->time_base, out_stream->time_base);

      //if dts is out of order, ffmpeg throws an error. So manually fix. Similar to what ffmpeg does in ffmpeg.c
      if(packet.dts < (*last_dts + !(output_context->oformat->flags & AVFMT_TS_NONSTRICT)) && packet.dts != AV_NOPTS_VALUE && (*last_dts) != AV_NOPTS_VALUE)
      int64_t next_dts = (*last_dts)+1;
      if(packet.pts >= packet.dts && packet.pts != AV_NOPTS_VALUE)
      packet.pts = FFMAX(packet.pts, next_dts);

      if(packet.pts == AV_NOPTS_VALUE)
      packet.pts = next_dts;

      packet.dts = next_dts;

      (*last_dts) = packet.dts;

      packet.pos = -1;
      packet.stream_index = stream_index;

      //output packet
      if(av_interleaved_write_frame(output_context, &packet) < 0)
      break;

      av_packet_unref(&packet);



      av_write_trailer(output_context);

      //cleanup
      if(!(out_format->flags & AVFMT_NOFILE))
      avio_close(output_context->pb);

      avformat_free_context(output_context);
      avformat_close_input(&audio_context);
      avformat_close_input(&video_context);
      return true;







      c++ ffmpeg libav






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Mar 9 at 0:16







      therex

















      asked Mar 8 at 23:35









      therextherex

      164




      164






















          1 Answer
          1






          active

          oldest

          votes


















          1














          I found the issue. I just needed to initialize last_video_dts and last_audio_dts to the minimum value for int64_t instead of 0.



          int64_t last_video_dts, last_audio_dts;
          last_video_dts = last_audio_dts = std::numeric_limits<int64_t>::lowest();


          Now the output is basically identical to that of the ffmpeg program.



          Edit:



          As mentioned by the kamilz, it is better and more portable to use AV_NOPTS_VALUE.



          int64_t last_video_dts, last_audio_dts;
          last_video_dts = last_audio_dts = AV_NOPTS_VALUE;





          share|improve this answer

























          • This doesn't looks portable, perhaps what you need was AV_NOPTS_VALUE.

            – the kamilz
            Mar 13 at 7:52











          • @thekamilz thanks for the heads up. Edited the answer to reflect this new information.

            – therex
            Mar 16 at 18:29











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          1 Answer
          1






          active

          oldest

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          active

          oldest

          votes






          active

          oldest

          votes









          1














          I found the issue. I just needed to initialize last_video_dts and last_audio_dts to the minimum value for int64_t instead of 0.



          int64_t last_video_dts, last_audio_dts;
          last_video_dts = last_audio_dts = std::numeric_limits<int64_t>::lowest();


          Now the output is basically identical to that of the ffmpeg program.



          Edit:



          As mentioned by the kamilz, it is better and more portable to use AV_NOPTS_VALUE.



          int64_t last_video_dts, last_audio_dts;
          last_video_dts = last_audio_dts = AV_NOPTS_VALUE;





          share|improve this answer

























          • This doesn't looks portable, perhaps what you need was AV_NOPTS_VALUE.

            – the kamilz
            Mar 13 at 7:52











          • @thekamilz thanks for the heads up. Edited the answer to reflect this new information.

            – therex
            Mar 16 at 18:29















          1














          I found the issue. I just needed to initialize last_video_dts and last_audio_dts to the minimum value for int64_t instead of 0.



          int64_t last_video_dts, last_audio_dts;
          last_video_dts = last_audio_dts = std::numeric_limits<int64_t>::lowest();


          Now the output is basically identical to that of the ffmpeg program.



          Edit:



          As mentioned by the kamilz, it is better and more portable to use AV_NOPTS_VALUE.



          int64_t last_video_dts, last_audio_dts;
          last_video_dts = last_audio_dts = AV_NOPTS_VALUE;





          share|improve this answer

























          • This doesn't looks portable, perhaps what you need was AV_NOPTS_VALUE.

            – the kamilz
            Mar 13 at 7:52











          • @thekamilz thanks for the heads up. Edited the answer to reflect this new information.

            – therex
            Mar 16 at 18:29













          1












          1








          1







          I found the issue. I just needed to initialize last_video_dts and last_audio_dts to the minimum value for int64_t instead of 0.



          int64_t last_video_dts, last_audio_dts;
          last_video_dts = last_audio_dts = std::numeric_limits<int64_t>::lowest();


          Now the output is basically identical to that of the ffmpeg program.



          Edit:



          As mentioned by the kamilz, it is better and more portable to use AV_NOPTS_VALUE.



          int64_t last_video_dts, last_audio_dts;
          last_video_dts = last_audio_dts = AV_NOPTS_VALUE;





          share|improve this answer















          I found the issue. I just needed to initialize last_video_dts and last_audio_dts to the minimum value for int64_t instead of 0.



          int64_t last_video_dts, last_audio_dts;
          last_video_dts = last_audio_dts = std::numeric_limits<int64_t>::lowest();


          Now the output is basically identical to that of the ffmpeg program.



          Edit:



          As mentioned by the kamilz, it is better and more portable to use AV_NOPTS_VALUE.



          int64_t last_video_dts, last_audio_dts;
          last_video_dts = last_audio_dts = AV_NOPTS_VALUE;






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Mar 16 at 18:26

























          answered Mar 10 at 14:12









          therextherex

          164




          164












          • This doesn't looks portable, perhaps what you need was AV_NOPTS_VALUE.

            – the kamilz
            Mar 13 at 7:52











          • @thekamilz thanks for the heads up. Edited the answer to reflect this new information.

            – therex
            Mar 16 at 18:29

















          • This doesn't looks portable, perhaps what you need was AV_NOPTS_VALUE.

            – the kamilz
            Mar 13 at 7:52











          • @thekamilz thanks for the heads up. Edited the answer to reflect this new information.

            – therex
            Mar 16 at 18:29
















          This doesn't looks portable, perhaps what you need was AV_NOPTS_VALUE.

          – the kamilz
          Mar 13 at 7:52





          This doesn't looks portable, perhaps what you need was AV_NOPTS_VALUE.

          – the kamilz
          Mar 13 at 7:52













          @thekamilz thanks for the heads up. Edited the answer to reflect this new information.

          – therex
          Mar 16 at 18:29





          @thekamilz thanks for the heads up. Edited the answer to reflect this new information.

          – therex
          Mar 16 at 18:29



















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