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• avcodec/cuviddec : Add support for decoding HEVC 4:4:4 content

  7 octobre 2018, par Philip Langdale

  avcodec/cuviddec : Add support for decoding HEVC 4:4:4 content
  This is the equivalent change for cuviddec after the previous change
  
  for nvdec. I made similar changes to the copying routines to handle
  
  pixel formats in a more generic way.
  Note that unlike with nvdec, there is no confusion about the ability
  
  of a codec to output 444 formats. This is because the cuvid parser is
  
  used, meaning that 444 JPEG content is still indicated as using a 420
  
  output format.
  

  • [DH] libavcodec/cuviddec.c

• Slicing video on several short clips of different lengths in one go

  1er décembre 2019, par Igniter

  I’ve got time codes using which I want to slice a short MP4 video (average length 5-7 minutes)

  [ 0, 15, 35, 52, 142, 215, ...] // time codes in seconds

  Usually there are 5-7 time codes meaning that I need to create 5-7 clips out of my initial video
  The fist clip is from start to 15 sec, the second one is from 15 sec to 35 sec, 35-52, etc.

  It’s trivial operation in Bash but I’m using ffmpeg on NodeJS and I’d like to do it without iteration in one go

  // Slicing a single clip
  
  ffmpeg -i input.mp4 -ss 0 -to 15 -c copy clip-01.mp4
  
  
  
  // Same command in NodeJS
  
  ffmpeg(`/tmp/${id}/input.mp4`)
  
    .renice(5)
  
    .outputOptions([
  
      '-ss 0',
  
      '-to 15',
  
      '-c copy'
  
    ])
  
    .on('end', () => {})
  
    .on('error', (e, stdout, stderr) => {})
  
    .save(`/tmp/${id}/clip-01.mp4`);

  No need for re-encoding, no need for precise timestamps (1 second out of sync is OK)
  Any thoughts or ideas would be greatly appreciated !

• Reject multiple headers of the same type.

  7 janvier 2015, par Tim Terriberry

  Reject multiple headers of the same type.
  A common application pattern is to call vorbis_synthesis_headerin()
  
   and count how many times it succeeds.
  
  If you feed it multiple valid comment headers, they will all
  
   succeed, meaning you can be fooled into think you have a valid
  
   Vorbis file despite never seeing a setup header.
  
  This patch makes libvorbis reject multiple headers of the same type,
  
   preventing this from occurring.
  git-svn-id : http://svn.xiph.org/trunk/vorbis@19426 0101bb08-14d6-0310-b084-bc0e0c8e3800
  

  • [DH] lib/info.c