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• ffmpeg failed to open h264 codec

  29 novembre 2015, par Joseph

  I’m trying to extract frames from an existed video (h264), using the ffmpeg library.
  When use an avi video file (with mjpeg - motion jpeg codec), all works fine.
  (m_formatCtx->iformat = av_find_input_format("mjpeg") ;)

  When run on the mp4 with h264 codec, we get the following errors, and no luck !!
  We fail when try to retrieve stream information by calling :
  avformat_find_stream_info(m_formatCtx, NULL) ;

  The log :

  [h264 @ 02023460] non-existing PPS 1 referenced
  
  [h264 @ 02023460] non-existing PPS 1 referenced
  
  [h264 @ 02023460] decode_slice_header error
  
  [h264 @ 02023460] non-existing PPS 6 referenced
  
  [h264 @ 02023460] decode_slice_header error
  
  [h264 @ 02023460] no frame!
  
  [h264 @ 0201a880] decoding for stream 0 failed
  
  [h264 @ 0201a880] Could not find codec parameters for stream 0 (Video: h264): unspecified size Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Could not find stream information

  Any idea ?

  the Code :

  We call

  CVideoReader::Open (file name , PRESET_MJPEG_CLOCKLESS_STREAM,
  IMAGE_FORMAT_RGB1)

  see below :

  bool CVideoReader::InitFormat(std::string _filepath)
  
  {
  
      m_formatCtx = avformat_alloc_context(); 
  
      m_formatCtx->iformat = NULL;
  
  
  
      if(m_videoPreset == PRESET_MJPEG_CLOCKLESS_STREAM)
  
      {
  
          m_formatCtx->iformat = av_find_input_format("h264");
  
         // Get timestamp from clock on arrival
  
          m_formatCtx->use_wallclock_as_timestamps = true;
  
      }
  
  
  
      int ret;
  
      // open input file, and allocate format context
  
      if ((ret = avformat_open_input(&m_formatCtx, _filepath.c_str(), m_formatCtx->iformat, NULL)) < 0) 
  
      {
  
          std::cerr << "Could not open source file" << std::endl;
  
          return false;
  
      }
  
  
  
      // retrieve stream information
  
      ret = avformat_find_stream_info(m_formatCtx, NULL);
  
      if (ret < 0) 
  
      {
  
          std::cerr << "Could not find stream information" << std::endl;
  
          return false;
  
      }
  
  
  
      m_videoStream = m_formatCtx->streams[0];
  
  
  
      av_dump_format(m_formatCtx, 0, _filepath.c_str(), 0);
  
      return true;
  
  }
  
  void CVideoReader::Open( char * _filepath, EVideoPreset _videoFormat, EImageFormat _imageDecodingFormat)
  
  {
  
      m_videoPreset = _videoFormat;
  
      if(!InitFormat(_filepath))
  
          return; 
  
  }
  
  
  
  
  
  CVideoReader m_vr = new CVideoReader ();
  
  m_vr->Open( (char *)inFile, CVideoReader::PRESET_MJPEG_CLOCKLESS_STREAM, CVideoReader::IMAGE_FORMAT_RGB1 );

• x86 : Avoid some bypass delays and false dependencies

  11 octobre 2015, par Henrik Gramner

  x86 : Avoid some bypass delays and false dependencies
  A bypass delay of 1-3 clock cycles may occur on some CPUs when transitioning
  
  between int and float domains, so try to avoid that if possible.
  

  • [DH] common/x86/deblock-a.asm
  • [DH] common/x86/mc-a.asm
  • [DH] common/x86/pixel-a.asm
  • [DH] common/x86/predict-a.asm
  • [DH] common/x86/sad-a.asm
  • [DH] common/x86/x86util.asm

• lavf/segment : add new option segment_clocktime_wrap_duration

  18 janvier 2016, par Marton Balint

  lavf/segment : add new option segment_clocktime_wrap_duration
  This option can force the segmenter to only start a new segment if a packet
  
  reaches the muxer within the specified duration after the segmenting clock
  
  time, which makes it more resilient to backward local time jumps, such as leap
  
  seconds or transition to standard time from daylight savings time.
  Reviewed-by : Stefano Sabatini <stefasab@gmail.com>
  
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] doc/muxers.texi
  • [DH] libavformat/segment.c