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• x264 : Optimal settings to have i-frames coincide with shot boundaries ?

  16 juin 2020, par kindoflike

  I would like to encode a video using x264 in such a way, that the keyframes (a.k.a. i-frames) are coinciding with shot boundaries (a.k.a. cuts).

  



  for testing, I used the following encoder settings (reference : http://www.chaneru.com/Roku/HLS/X264_Settings.htm) :

  



  keyint=500:min-keyint=10:scenecut:40


  



  but from the looks of it scene changes are ignored entirely, and keyframes simply inserted every 500 frames.

  



  

  



  scenecut:40 being the default value, is my result expected behavior ? or is it an indication, that something is not quite right ?

  



  thanks a lot in advance

  



  ---

  



  edit :

  



  the complete encoder settings look like this (in handbrake) :

  



  

  



  ---

  



  TL ;DR :

  



  it was a typo :|

  


• avcodec/pngenc : Avoid copying APNG data, allow user-supplied buffer

  25 avril 2021, par Andreas Rheinhardt

  avcodec/pngenc : Avoid copying APNG data, allow user-supplied buffer
  The APNG encoder already uses internal buffers, so that the packet size
  
  is already known before allocating the packet ; therefore one can avoid
  
  another (implicit) intermediate buffer by switching to
  
  ff_get_encode_buffer(), thereby also supporting user-supplied buffers.
  Reviewed-by : James Almer <jamrial@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/pngenc.c

• Node Webkit-Designing Media Player support all media codec(format)

  14 décembre 2015, par Vish

  I am working on product which classify any kind of media into movies, tv shows, videos, audio and images. Node webkit with angularjs and node is its base. Now I am trying to bring local playback, which enabled this classified media to play inside this desktop app. Have done lot of research, following are feasible solution to me :

  1. Getting ffmpegsumo.dll with all codec support, hence html <audio></audio> and <video></video> able to play all this videos.
  2. All unsupported video or audio to be converted into supporting codec format and steam it to <audio></audio> and <video></video> tag.
  3. Use some third party plugin to support like WebCherima .

  Option 1 and 2 are not looking feasible to me. For option 1, we have compile Chromium 41.0.2272.76 or nw.js v0.12.3 to update ffmpegsumo.dll with more codec. On other side Option 2 looking difficult to get good performance. I have learn few limitation of third party plugins.
  Please provide some insight ? Thanks !