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• FFMPEG : Can not free AVPacket when decode H264 stream ?

  13 janvier 2016, par TTGroup

  I’m using FFMPEG to decode H264 stream, my code is below

  AVFormatContext *pFormatCtx = NULL;
  
  AVCodecContext  *pCodecCtx = NULL;
  
  AVFrame         *pFrame = NULL;
  
  AVPacket        packet;
  
  packet.data = NULL;
  
  
  
  pFormatCtx = avformat_alloc_context();  
  
  avformat_open_input(&pFormatCtx, videoStreamPath, NULL, NULL);
  
  liveHeader.pCodecCtx = pFormatCtx->streams[videoStreamIndex]->codec;
  
  
  
  int  bytesDecoded = 0;
  
  int  frameFinished = 0;
  
  while (true)
  
  {
  
      while (packet.size > 0)
  
      {
  
          // Decode the next chunk of data
  
          bytesDecoded = avcodec_decode_video2(pCodecCtx, pFrame,
  
              &frameFinished, &packet);
  
  
  
          // Was there an error?
  
          if (bytesDecoded < 0)
  
          {
  
              printf(strErr, "Error while decoding frame\n");
  
              commonGlobal->WriteRuntimeRecLogs(strErr);
  
              return RS_NOT_OK;
  
          }
  
  
  
          packet.size -= bytesDecoded;
  
          packet.data += bytesDecoded;
  
          if (frameFinished)
  
          {               
  
              //av_free_packet(&packet); //(free 1)
  
              return RS_OK;
  
          }
  
          // Did we finish the current frame? Then we can return
  
      }
  
      do
  
      {
  
          try
  
          {
  
              int ret = av_read_frame(pFormatCtx, &packet);
  
              if (ret < 0)
  
              {
  
                  char strErr[STR_LENGTH_256];
  
                  if (ret == AVERROR_EOF || (pFormatCtx->pb && pFormatCtx->pb->eof_reached))
  
                  {
  
                      sprintf(strErr, "Error end of file line %d", __LINE__);
  
                  }
  
                  if (pFormatCtx->pb && pFormatCtx->pb->error)
  
                  {
  
                      sprintf(strErr, "Error end of file line %d", __LINE__);
  
                  }
  
                  packet.data = NULL;
  
                  return RS_NOT_OK;
  
              }
  
          }
  
          catch (...)
  
          {
  
              packet.data = NULL;
  
              return RS_NOT_OK;
  
          }
  
      } while (packet.stream_index != videoStreamIndex);
  
  }
  
  
  
  //av_free_packet(&packet); //(free 2)

  The problem is I don’t know how to free memory of packet correctly.

  I have tried to delete packet’s data by calling one of two places av_free_packet(&packet); (free 1) and av_free_packet(&packet); (free 2). And the result is the application was crashed with the message "Heap Corruption..."

  If I do not free the packet, the memory leak is occur.

  Note that the above code is successful when decode H264 stream, the main problem is memory leak and crashed when I try to free the packet

  Someone can show me the problems in my code.

  Many thanks,

  T&T

• lavu : Add av_gettime_relative

  22 octobre 2014, par Martin Storsjö

  lavu : Add av_gettime_relative
  Since av_gettime() is used in a number of places where actual
  
  real time clock is required, the monotonic clock introduced in
  
  ebef9f5a5 would have consequences that are hard to handle. Instead
  
  split it into a separate function that can be used in the cases
  
  where only relative time is desired.
  On platform where no monotonic clock is available, the difference
  
  between the two av_gettime functions is not clear, and one could
  
  mistakenly use the relative clock where an absolute one is
  
  required. Therefore add an offset, to make it evident that the
  
  time returned from av_gettime_relative never is actual current
  
  real time, even though it is based on av_gettime.
  Based on a patch by Olivier Langlois.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] doc/APIchanges
  • [DBH] libavutil/time.c
  • [DBH] libavutil/time.h
  • [DBH] libavutil/version.h

• Merge remote-tracking branch ’qatar/master’

  15 mai 2013, par Michael Niedermayer

  Merge remote-tracking branch ’qatar/master’
  * qatar/master :
  
    configure : Use linker hardening flags on mingw
  
    vc1 : Make INIT_LUT() self contained
  
    vc1 : Simplify code by using INIT_LUT()
  
    vc1 : Move INIT_LUT() further up to allow using it in more places
  
    vc1dec : Remove some now unused variables
  
    vc1dec : Do not allow field_mode to change after the first header
  
    vc1, mss2 : Check for any negative return value from ff_vc1_parse_frame_header
  
    vc1dec : Fix current ptr selection in vc1_mc_4mv_chroma()
  
    vc1dec : Factorize picture pointer selection in vc1_mc_4mv_chroma()
  
    vc1dec : Factorize picture pointer selection code
  
    vc1dec : Factorize srcU/V offseting
  
    vc1dec : Fix tff == 0 handling in init_block_index()
  
    vc1dec : Update destination pointers in context for fields
  Conflicts :
  
  	libavcodec/vc1.c
  
  	libavcodec/vc1dec.c
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] configure
  • [DH] libavcodec/mss2.c
  • [DH] libavcodec/vc1.c
  • [DH] libavcodec/vc1dec.c