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• How to scan a folder recursively in ffmpeg to check for presence of subtitles ?

  22 décembre 2022, par frosty

  I have a folder (with subfolders) of videos on my Raspberry Pi, some containing soft-embedded subtitles and some without.

  


  I want to use ffmpeg to check for the presence of the soft-embedded subtitle, and return a result against each filename so that I can locate.

  


  The videos may be mp4, mkv or avi.

  


  I have been using this command successfully but in a limited way as it only works for .mp4 files and doesn't check recursively. The output is a nice list with either a 0 or 1 at the beginning of the line, where 1 means that there is no subtitle.

  


  for f in *.mp4; do ffmpeg -i "$f" -c copy -map 0:s:0 -frames:s 1 -f null - -v 0 -hide_banner; echo $? "$f" ; done


  


  I have tried all manner of ways like find and -exec, read, xargs, all to no avail. The below is the closest I've got, but it doesn't deal with whitespaces properly so filenames including spaces are split over two lines and the command seems to run only one word at a time, so it fails and shows 1 for everything.

  


  for f in `find /mnt/SSD/ | grep -E '(.mp4|.mkv|.avi)'`; do ffmpeg -i "$f" -c copy -map 0:s:0 -frames:s 1 -f null - -v 0 -hide_banner; echo $? "$f" ; done


  


  Any ideas what I'm doing wrong ?

  


• avcodec/mips : Improve hevc uni weighted vert mc msa functions

  11 octobre 2017, par Kaustubh Raste

  avcodec/mips : Improve hevc uni weighted vert mc msa functions
  Pack the data to half word before clipping.
  
  Use immediate unsigned saturation for clip to max saving one vector register.
  Signed-off-by : Kaustubh Raste <kaustubh.raste@imgtec.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mips/hevc_mc_uniw_msa.c

• x86inc : AVX-512 support

  25 mars 2017, par Henrik Gramner

  x86inc : AVX-512 support
  AVX-512 consists of a plethora of different extensions, but in order to keep
  
  things a bit more manageable we group together the following extensions
  
  under a single baseline cpu flag which should cover SKL-X and future CPUs :
  
   * AVX-512 Foundation (F)
  
   * AVX-512 Conflict Detection Instructions (CD)
  
   * AVX-512 Byte and Word Instructions (BW)
  
   * AVX-512 Doubleword and Quadword Instructions (DQ)
  
   * AVX-512 Vector Length Extensions (VL)
  On x86-64 AVX-512 provides 16 additional vector registers, prefer using
  
  those over existing ones since it allows us to avoid using `vzeroupper`
  
  unless more than 16 vector registers are required. They also happen to
  
  be volatile on Windows which means that we don't need to save and restore
  
  existing xmm register contents unless more than 22 vector registers are
  
  required.
  Big thanks to Intel for their support.
  

  • [DH] libavutil/x86/x86inc.asm