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• avformat_alloc_context : initialize raw_packet_buffer_remaining_size.

  9 mai 2015, par Reimar Döffinger

  avformat_alloc_context : initialize raw_packet_buffer_remaining_size.
  This currently works for most users because
  
  avformat_open_input sets it, but this patch fixes any
  
  applications not using that function.
  Signed-off-by : Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  

  • [DH] libavformat/options.c

• An H264 encoded MP4 file cannot be played by VLC/HTML5 browsers, is there any header or meta data I can add to fix it ? [migrated]

  5 avril 2015, par user534498

  I have an MP4 file, which is H264 encoded. I saved the file from RTP streams, with sprop-property-sets in front, and followed by frames. (Note. VLC can directly play the RTP stream without problem.)

  The file can be played by "Videos" program in Linux. If I play it with VLC 2.1.4 in Linux, it shows the following error.

  No suitable decoder module : VLC does not support the audio or video
  format "undf". Unfortunately there is no way for you to fix this.

  I then open VLC, from preference menu, I change the Demuxer (demultiplexer) from automatic to "H264 Video Demuxer". VLC can then play it.

  So it seems that the problem is VLC cannot automatically detect a demuxer from the video file. However, I am sure that my video file has only video data, and it doesn’t even have audio (may not even need a demuxer ?)

  I put this file in HTTP server, and use "video" tag for testing, all IE, chrome and firefox browsers cannot play this file, and I guess it’s the same reason as VLC cannot play it.

  So is there a way to fix it ? For example, is there any place I can add a header to tell VLC or similar players to choose H264 video demuxer ?

  Thanks.

• Revision a0043c6d30 : Enhance the transform skipping decision-making in non-rd mode For large partiti

  25 mars 2015, par Yunqing Wang

  Changed Paths :
   Modify /vp9/encoder/vp9_pickmode.c

  
  
  Enhance the transform skipping decision-making in non-rd mode

  For large partition blocks(block_size > 32x32), the variance
  calculation is modified so that every 8x8 block’s variance
  is stored during the calculation, which is used in the
  following transform skipping test. Also, the variance for
  every tx block is calculated. The skipping test checks all tx
  blocks in the partition, and sets the skip flag only if all tx
  blocks are skippable. If the skip flag of Y plane is 1, a
  quick evaluation is done on UV planes. If the current partition
  block is skippable in YUV planes, the mode search checks fewer
  inter modes and doesn’t check intra modes.

  The rtc set borg test(at speed 6) showed that :
  Overall psnr : -0.527% ; Avg psnr : -0.510% ; ssim : -0.573%.
  Average single-thread speedup on rtc set was 3.5%.
  For 720p clips, more speedups were seen.
  gipsrecmotion : 13%
  gipsrestat : 12%
  vidyo : 5 - 9%
  dark : 15%
  niklas : 6%

  Change-Id : I8d8ebec0cb305f1de016516400bf007c3042666e