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• rtsp : rename certain options after a deprecation period

  25 janvier 2018, par wm4

  rtsp : rename certain options after a deprecation period
  The "timeout" option name inherently clashes with the meaning of the
  
  HTTP libavformat protocol option with the same name. Rename it after a
  
  deprecation period to make it compatible with the HTTP one.
  

  • [DH] doc/APIchanges
  • [DH] libavformat/rtsp.c
  • [DH] libavformat/version.h

• FFMPEG error code description

  16 juillet 2014, par Ram Krishna

  We are using FFmpeg libraries git-ee94362 libavformat v55.2.100. Our
  purpose is to mux two streams (video and audio) into M3U8 playlist using
  HLS.
  We are using AV_CODEC_ID_H264 output encoder, AV_PIX_FMT_YUV420P output
  video pixel format and CODEC_FLAG_GLOBAL_HEADER flag for the encoder.
  The last causes us to use "h264_mp4toannexb" bit stream filter.
  So, here is the code snippet :

  AVPacket outpkt = {0};
  
  int isGotVideoPacket = 0;
  
  
  
  av_init_packet(&outpkt);
  
  
  
  // convert time in stream time base units, so that the encoder will fill
  
  the packet appropriately
  
  out_video_frame->pts = (int64_t) (video_frame_count *
  
  in_video_frame_duration / av_q2d(out_video_stream->time_base));
  
  
  
  int ret = avcodec_encode_video2(enc_out_video_ctx, &outpkt,
  
  out_video_frame[i], &isGotVideoPacket);
  
  
  
  assert(0 <= ret);
  
  
  
  // if size is zero, it means the image was buffered
  
  if ((1 == isGotVideoPacket) && (0 < outpkt.size)) {
  
  
  
   AVPacket new_outpkt = outpkt;
  
  
  
   if ((AVBitStreamFilterContext*) 0 != vbsf_ctx) {
  
    AVPacket new_outpkt = outpkt;
  
  
  
    ret = av_bitstream_filter_filter(vbsf_ctx, enc_out_video_ctx, (const
  
  char*)0,
  
     &new_outpkt.data, &new_outpkt.size, outpkt.data, outpkt.size,
  
     outpkt.flags & AV_PKT_FLAG_KEY);
  
  
  
    if (ret > 0)
  
    {
  
     outpkt = new_outpkt;
  
    }
  
    else
  
    {
  
     // We get ret = -22
  
     char errbuf[128] = "";
  
  
  
                          // Both the functions get "Error number -22
  
  occurred" that don't explain anything
  
      av_strerror (ret, errbuf, 128);
  
     av_make_error_string (errbuf, 128, ret);
  
  
  
    }
  
  
  
    assert(0 <= ret);
  
  
  
   }
  
  
  
   outpkt->stream_index = output_video_stream->index;
  
  
  
   // If to comment av_bitstream_filter_filter() and "if-else", then
  
   // At frame #37 we get the following error from
  
  av_interleaved_write_frame():
  
   // [mpegts @ 09628140] H.264 bitstream malformed, no startcode found, use
  
  the h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb).
  
   ret = av_interleaved_write_frame(ofmt_ctx, &outpkt);
  
  
  
   assert(0 <= ret);
  
  }

  Our questions :
  1. What is the meaning of the "-22" error from av_bitstream_filter_filter() ?

  1. Where can we get full FFMPEG error code description list ?

• hevc : deobfuscate slice/tile boundary handling for DBF

  27 juillet 2014, par Anton Khirnov

  hevc : deobfuscate slice/tile boundary handling for DBF
  Use named constants instead of magic numbers, avoid using variables with
  
  inverse meaning from what their name implies.
  

  • [DBH] libavcodec/hevc.c
  • [DBH] libavcodec/hevc.h
  • [DBH] libavcodec/hevc_filter.c