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• avformat/matroskaenc : Don't use stream side-data size

  21 mai 2020, par Andreas Rheinhardt

  avformat/matroskaenc : Don't use stream side-data size
  av_stream_get_side_data() tells the caller whether a stream has side
  
  data of a specific type ; if present it can also tell the caller the size
  
  of the side data via an optional argument. The Matroska muxer always
  
  used this optional argument, although it doesn't really need the size,
  
  as the relevant side-data are not buffers, but structures. So change
  
  this.
  Furthermore, relying on the size also made the code susceptible to
  
  a quirk of av_stream_get_side_data() : It only sets the size argument if
  
  it found side data of the desired type. mkv_write_video_color() checks
  
  for side-data twice with the same variable for the size without resetting
  
  the size in between ; if the second type of side-data isn't present, the
  
  size will still be what it was after the first call. This was not
  
  dangerous in practice, as the check for the existence of the second
  
  side-data compared the size with the expected size, so it would only be
  
  problematic if lots of elements were to be added to AVContentLightMetadata.
  Reviewed-by : James Almer <jamrial@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskaenc.c

• ffmpeg for browser side ? [on hold]

  18 janvier 2016, par Allan

  I want to be able to use ffmpeg browser side for my web app and have done some research on the Internet and have found this. And there are 2 problems with that ffmpeg.js :

  1. It is much slower than the native ffmpeg
  2. The ffmpeg.js file is too big to be downloaded each time by a user

  I was wondering if anyone has any experience to use any version of ffmpeg browser side like the above but got any faster results please( close to native ffmpeg’s speed).

  Any ideas to make the ffmpeg.js like an extension for chrome or cache it on the browser or any other ways around this using node cluster or anything else please ?! Any ideas would be greatly appreciated !

• lavc/videotoolboxenc : Handle hwaccel format as input

  27 avril 2016, par Rick Kern

  lavc/videotoolboxenc : Handle hwaccel format as input
  Handle AV_PIX_FMT_VIDEOTOOLBOX.
  
  This results in better energy usage and faster encoding, especially on iOS.
  
  When the buffer comes from the media server, no memcpy’s are needed.
  Signed-off-by : Rick Kern <kernrj@gmail.com>
  

  • [DH] libavcodec/videotoolboxenc.c