[Libav-user] pkt.dts/pts clarification

[Gonzalo Garramuno]

I am looking for the final word on pkt.pts/dts for movies that are not 
streaming and how to hold a valid packet queue.


   int got_pict = 0;

   while( pkt.size > 0 )
   {
      int err = avcodec_decode_video2( stream->codec, av_frame, &got_pict,
                       &pkt );

      if ( err < 0 ) {
     return kDecodeError;
      }

      if ( got_pict ) {
     ptsframe = av_frame_get_best_effort_timestamp( av_frame );
     ptsframe = pts2frame( stream, ptsframe );

     store_image( ptsframe );  // store image in queue

     std::cerr << "STORE REPEAT " << store << " PTSFRAME " << ptsframe
           << " pkt.pts " << pkt.pts
           << " pkt.dts " << pkt.dts
           << " f->pts " << _av_frame->pts << " f->pkt_pts "
           << _av_frame->pkt_pts << " f->pkt_dts "
           << _av_frame->pkt_dts << std::endl;

      }

      pkt.size -= err;
      pkt.data += err;
   }

   if ( got_pict ) return kDecodeOK;
   return kDecodeMissingFrame;

The above works well with decoding images with a proper pts. However, it 
does not work well with the "cached" frames of the video (mainly 2 
frames in my case).
I am wondering how should I work around that.  The demuxing example is 
very barebones and ffplay seems not to care about them.