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• avcodec/mips: Improve hevc uni weighted 4 tap hz mc msa functions

  3 November 2017, by Kaustubh Raste

  avcodec/mips: Improve hevc uni weighted 4 tap hz mc msa functions
  Use global mask buffer for appropriate mask load.
  
  Use immediate unsigned saturation for clip to max saving one vector register.
  
  Remove unused macro.
  Signed-off-by: Kaustubh Raste <kaustubh.raste@imgtec.com>
  
  Reviewed-by: Manojkumar Bhosale <Manojkumar.Bhosale@imgtec.com>
  
  Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mips/hevc_mc_uniw_msa.c

• avcodec/mips: Improve hevc uni weighted 4 tap vt mc msa functions

  6 November 2017, by Kaustubh Raste

  avcodec/mips: Improve hevc uni weighted 4 tap vt mc msa functions
  Use global mask buffer for appropriate mask load.
  
  Use immediate unsigned saturation for clip to max saving one vector register.
  
  Remove unused macro.
  Signed-off-by: Kaustubh Raste <kaustubh.raste@imgtec.com>
  
  Reviewed-by: Manojkumar Bhosale <Manojkumar.Bhosale@imgtec.com>
  
  Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mips/hevc_mc_uniw_msa.c

• time progress bar does not scale by sec in FFMPEG chopped mp4 in iOS and Android devices

  10 July 2017, by Xi Xiao

  I have used the below command to cut out a 44sec length video. The result video can be found here.

  ffmpeg -i friends.mkv -ss 00:15:30.0 -t 44 -vf scale=640:360  video.mp4

  One odd issue appears from the generated video.mp4.

  when playing it in iphone 7 and huawei honor8 android, the time progress bar does not scale by second.

  What I mean is, for example, the video can start to play either from 0 second or 6 second. But, if I drag the progress bar to time between 0 - 6, such as 4, the video player will jump to 0 and play, instead of playing from 4 second.

  When I use Javascript to setTime for 2 second for html5 video player, it does not work either, i.e. the player will play from 0 second instead of 2. Code is as below:

  var vid = document.getElementById("video1");
  
  vid.currentTime = 2;
  
  vid.play();

  screenshot made in iphone 7

  I stop the video, try set the progress bar between 0 and 6 as in screenshot. When I click play, the player will play from 0.

  

  In what devices have I tested it?

  • This issue appears in iphone 7, huawei honor8 android phone.
  • This issue does not appear in PC browser, nor in ipad.

  At last, I suspect that the issue roots from video codec, but had no success to locate the keyword to explain my issue and google the solution.