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• avformat/wavenc : Fix leak and segfault on reallocation error

  22 février 2021, par Andreas Rheinhardt

  avformat/wavenc : Fix leak and segfault on reallocation error
  Up until now, the wav muxer used a reallocation of the form ptr =
  
  av_realloc(ptr, size) ; that leaks upon error. Furthermore, if a
  
  failed reallocation happened when writing the trailer, a segfault
  
  would occur due to avio_write(NULL, size) because the muxer only
  
  prints an error message upon allocation error, but does not return
  
  the error.
  Moreover setting the pointer to the buffer to NULL on error seems to
  
  be done on purpose in order to record that an error has occured so that
  
  outputting the peak values is no longer attempted. This behaviour has
  
  been retained by simply disabling whether peak data should be written
  
  if an error occurs.
  Finally, the reallocation is now done once per peak block and not once
  
  per peak block per channel ; it is also done with av_fast_realloc and not
  
  with a linear size increase.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/wavenc.c

• 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);
        }
}