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• avcodec/nvdec : Round up odd width/height values

  24 novembre 2017, par Philip Langdale

  avcodec/nvdec : Round up odd width/height values
  nvdec will not produce odd width/height output, and while this is
  
  basically never an issue with most codecs, due to internal alignment
  
  requirements, you can get odd sized jpegs.
  If an odd-sized jpeg is encountered, nvdec will actually round down
  
  internally and produce output that is slightly smaller. This isn't
  
  the end of the world, as long as you know the output size doesn't
  
  match the original image resolution.
  However, with an hwaccel, we don't know. The decoder controls
  
  the reported output size and the hwaccel cannot change it. I was
  
  able to trigger an error in mpv where it tries to copy the output
  
  surface as part of rendering and triggers a cuda error because
  
  cuda knows the output frame is smaller than expected.
  To fix this, we can round up the configured width/height passed
  
  to nvdec so that the frames are always at least as large as the
  
  decoder's reported size, and data can be copied out safely.
  In this particular jpeg case, you end up with a blank (green) line
  
  at the bottom due to nvdec refusing to decode the last line, but
  
  the behaviour matches cuviddec, so it's as good as you're going to
  
  get.
  

  • [DH] libavcodec/nvdec.c

• Use a video editing library (not executable) via Node [on hold]

  25 septembre 2018, par Merc

  I need to edit clips using node. I am looking around, and most (if not all) libraries seem (like Fluent FFMpeg) seem to be based on the fact that they run FFMPEG as an executable and get the resulting output.

  That’s not what I want. I worked with FFMPEG executable in the past, and I know how flaky it is in terms of return codes and error codes.

  Ideally, I would love to find a native library for video editing and make calls using node.

  In terms of libraries :

  • Gstreamer
  • FFmpeg/LibAV (does they come with C libraries to bind to ?)
  • libVLC

  In terms of binding with them :

  • node-gir. Gstreamer seems to have updated git files

  • native bindings. For example Gstreamer has gstreamer-superficial. I couldn’t find any javascript bindings forFFMPEG — only "run the executable and hope for the best" libraries

  • VLC has a bindings library that is quite old and had its last commit years ago.

  Am I getting this all wrong ?
  My ideal outcome is to have a nice, robust library that I use directly using node, but my lack of experience in terms of using native libraries, and the somehow fragmented world of video editing libraries.

• avcodec/rdft : remove sintable

  7 juillet 2017, par Muhammad Faiz

  avcodec/rdft : remove sintable
  It is redundant with costable. The first half of sintable is
  
  identical with the second half of costable. The second half
  
  of sintable is negative value of the first half of sintable.
  The computation is changed to handle sign of sin values, in
  
  C code and ARM assembly code.
  Signed-off-by : Muhammad Faiz <mfcc64@gmail.com>
  

  • [DH] libavcodec/Makefile
  • [DH] libavcodec/arm/rdft_neon.S
  • [DH] libavcodec/rdft.c
  • [DH] libavcodec/rdft.h