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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

• FFMPEG : Making a specifc range of color pixels transparent

  28 décembre 2017, par Pan Ng

  I am trying to overlay one video on top of another using ffmpeg, but couldn’t quite understand the error.
  I based on the existing command from here

  More specifically, I want to replace the all colors close to a specific color (say brown r:82,g:44,b:11), and then have them set as transparent.

  ffmpeg -i moonmen.mp4 -i transparent_overlay.mp4 -filter_complex
  
  "[1]split[m][a];
  
   [a]geq='if(between(r(X,Y), 77, 87)*between(g(X,Y), 39, 49)*between(b(X,Y), 06, 16) ,255:255:255,0:0:0)';
  
   [m][al]alphamerge[ovr];
  
   [0][ovr]overlay"
  
  output.mp4

  but I got error :

  [Parsed_geq_1 @ 0x7fc8e2e08400] Either YCbCr or RGB but not both must be specified
  
  [AVFilterGraph @ 0x7fc8e2e07c60] Error initializing filter 'geq' with args 'if(between(r(X,Y), 77, 87)*between(g(X,Y), 39, 49)*between(b(X,Y), 06, 16) ,255:255:255,0:0:0)'
  
  Error initializing complex filters.
  
  Invalid argument

• How to live stream a local video using FFmpeg [closed]

  20 novembre 2022, par param trivedi

  I have been trying to stream local video on VLC using the FFmpeg library like this :

  


  $ ffmpeg -i sample.mp4 -v 0 -vcodec mpeg4 -f mpegts udp://127.0.0.1:23000


  


  I have not been able to stream the file on VLC.