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• avformat/tests/fifo_muxer : Fix memleak on error, fix API violation

  19 mars 2021, par Andreas Rheinhardt

  avformat/tests/fifo_muxer : Fix memleak on error, fix API violation
  The test program for the FIFO muxer allocates a buffer without padding
  
  and wraps it into a packet via av_packet_from_data(). This is an API
  
  violation. Furthermore, said buffer leaks in case av_packet_from_data()
  
  fails. Fix both of these issues by using av_new_packet() instead.
  Reviewed-by : James Almer <jamrial@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/tests/fifo_muxer.c

• How to track reference counts in libffmpeg [on hold]

  24 avril 2019, par Serban Stoenescu

  I have some code that uses FFMPEG. It looks something like this :

  AVFrame *frame{ mDecoder->getNext(packet.data, packet.size) }; //mDecoder just gets the frame from the stream
  
    av_packet_unref(&packet);

  I want to be able to print the reference counts for each packet because I want to avoid memory leaks. Plus I want to know how AVFrames behave when they are cloned, assigned, etc.

  I tried something like this, based on what I found in their documentation https://ffmpeg.org/doxygen/4.0/structAVBufferRef.html :

  frame->buf[0]->buffer->refcount;

  But I get this compilation error :

  ../src/sco/node/H264Decoder.cpp:30:24: fatal error: member access into incomplete type 'AVBuffer'
  
    frame->buf[0]->buffer->refcount;
  
                         ^
  
  /opt/ffmpeg/include/libavutil/buffer.h:73:16: note: forward declaration of 'AVBuffer'
  
  typedef struct AVBuffer AVBuffer;

  Any way to do this ?

• How to properly abort av_seek_frame on FFmpeg ?

  5 mars 2021, par SuRGeoNix

  Normally, you wouldn't care aborting av_seek_frame as it would be really fast on a local file. However, in my case I use a custom AVIOContext for torrent streaming with custom read/seek functions and I'm not able to abort a single seek request !

  


  I've already tried interrupt callbacks (they will not be called at all), some timeouts (rw_timeout/timeout etc.) but by checking FFmpeg's code didn't find anything at all. My last chance was to try to return on read/seek functions an error (I've tried AVERROR_EXIT) which causes even more problems (memory leaks).

  


  The main issue is with Matroska formats that they need to resync (level-1) and they are trying to scan the whole file.

  


  Unfortunately, I'm using C# .NET with FFmpeg.Autogen bindings which means that I don't have low-level access to play around. My workaround is to re-open the whole format context in case on seek abort (to ensure that the player will continues to play at least)

  


  Hope you have a tip for me !

  


  (By the way for some http/hls web formats interrupt callbacks are supported)