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• vdpau : do not use buggy HEVC support by default

  1er juillet 2017, par wm4

  vdpau : do not use buggy HEVC support by default
  NVIDIA broke its own API when using VDPAU decoding. If you retrieve the
  
  decoded YUV data, or if you map the surfaces with GL interop, the result
  
  are interlacing artifacts. The only way to get non-broken data is by
  
  using the vdpau video mixer to convert it to RGB. There is no way to
  
  block the non-working operations in a reasonable way (a VdpVideoSurface
  
  has to support all operations).
  NVIDIA refuses to fix this issue (they "fixed" it by making it work with
  
  the video mixer, but the rest is still broken). There is no sign of that
  
  changing.
  Do not use HEVC by default with the generic hwaccle API. Detect whether
  
  it's the NVIDIA native implementation, and exit with an error. (The same
  
  thing work with the MESA implementation.)
  As an escape hatch and to allow applications to use the decoder if they
  
  really want to (perhaps because they make sure to explicitly use the
  
  video mixer), reuse AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH to disable
  
  this check.
  Once NVIDIA fixes the bug, working driver versions could be detected,
  
  and it could be allowed again.
  

  • [DH] libavcodec/vdpau.c

• avcodec/x86 : cleanup simple_idct10

  1er juin 2017, par James Darnley

  avcodec/x86 : cleanup simple_idct10
  Use named arguments for the functions so we can remove a define.  The
  
  stride/linesize argument is now ptrdiff_t type so we no longer need to
  
  sign extend the register.
  

  • [DH] libavcodec/x86/proresdsp.asm
  • [DH] libavcodec/x86/simple_idct10.asm
  • [DH] libavcodec/x86/simple_idct10_template.asm

• WebVTT Audio Descriptions for Elephants Dream

  10 mars 2015, par silvia

  When I set out to improve accessibility on the Web and we started developing WebSRT – later to be renamed to WebVTT – I needed an example video to demonstrate captions / subtitles, audio descriptions, transcripts, navigation markers and sign language.

  I needed a freely available video with spoken text that either already had such data available or that I could create it for. Naturally I chose “Elephants Dream” by the Orange Open Movie Project , because it was created under the Creative Commons Attribution 2.5 license.

  As it turned out, the Blender Foundation had already created a collection of SRT files that would represent the English original as well as the translated languages. I was able to reuse them by merely adding a WEBVTT header.

  Then there was a need for a textual audio description. I read up on the plot online and finally wrote up a time-alignd audio description. I’m hereby making that file available under the Create Commons Attribution 4.0 license. I’ve added a few lines to the medadata headers so it doesn’t confuse players. Feel free to reuse at will – I know there are others out there that have a similar need to demonstrate accessibility features.

  The post WebVTT Audio Descriptions for Elephants Dream first appeared on ginger’s thoughts.