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• avformat : call AVOutputFormat->deinit() when freeing the context

  19 octobre 2019, par James Almer

  avformat : call AVOutputFormat->deinit() when freeing the context
  Despite the doxy stating that it's called when the muxer is destroyed,
  
  this was not true in practice. It's only called by av_write_trailer()
  
  and on init() failure.
  An AVFormatContext may be closed without writing the trailer if errors
  
  ocurred while muxing packets, so in order to prevent memory leaks, it
  
  should effectively be called when freeing the muxer.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/mux.c
  • [DH] libavformat/utils.c

• FFMPEG c++ memory leak issue when reading the packet

  19 novembre 2020, par santosh

  I have written a program to read the frames from a video file. Everything works perfect except below described issue.
after reading the frame, when I call avcode_send_packet function, it leaks the memory.
I used av_packet_unref before reading the next frame. But still the memory leak is not resolved.
I am using FFMPEG latest 4.3 version on WIndows 10.

  


  also av_frame_unref does not fix the memory leak. I think data buffer inside the packet does not get freed somehow I feel it is related to FFMPEG version issue as I see the similar coding done by other programmers on the internet.

  


  Does any one have idea about how to fix this memory leak ?

  


  ----------------- code is as below-----------------------
... here code related to setting avformatcontext, and avcodeccontext.

  


  while(1)
    {
        if (av_read_frame(pFormatCtx, packet) >= 0)
        {
            if (packet->stream_index == videoindex)
            {

                ret = avcodec_send_packet(pCodecCtx, packet);//on executing this line, memory shoots up in MBs , everytime.
                if (ret < 0)
                {
                    av_packet_unref(packet);
                    fprintf(stderr,"Failed to Decode packet. \n:%s", av_err2str(ret));
                    return -1;
                }

                ret = avcodec_receive_frame(pCodecCtx, pAvFrame);
                if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
                {
                    av_packet_unref(packet);
                    continue;
                }
                if (ret < 0)
                {
                    av_packet_unref(packet);
                    printf("Failed to Decode packet. \n");
                    return -1;
                }
                av_packet_unref(packet);

                
                {
                    //.. do something with the frame.
                }
                av_frame_unref(pAvFrame);

            }
            
            av_packet_unref(packet);
        }
}


  


• avformat/nutenc : implement deinit()

  21 janvier 2016, par Michael Niedermayer

  avformat/nutenc : implement deinit()
  Should prevent some leaks if header writing fails
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/nut.c
  • [DH] libavformat/nutenc.c