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• How to compare MPEG-7 Video Signature signatures

  22 juin 2020, par Nick Russler

  I want to get a measure of similarity of two videos by using their precomputed MPEG-7 video signatures. While ffmpeg supports comparing two videos for a match by inputting the videos directly I can't find a way to compare the signature files (bin or xml) later without the original video files.

  



  After digging through some ffmpeg code I found these lines here and here, but I am stuck.

  



  Is there a simple way to compute a similarity score with those MPEG-7 video signature files ?

  


• avformat/hlsenc : compare without the last directory separator in get_relative_url

  10 janvier 2020, par Steven Liu

  avformat/hlsenc : compare without the last directory separator in get_relative_url
  fix ticket : 8461
  
  there is no problem before commit 75aea52a1051a22bdebd0b7a8098ac6479a529a0
  Reviewed-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
  
  Signed-off-by : Steven Liu <lq@chinaffmpeg.org>
  

  • [DH] libavformat/hlsenc.c

• Batch encode then compare file size vs original and delete larger

  6 novembre 2019, par PolarBear

  Currently running a batch script to mass convert media clips to save some storage space. I’d like to also add automation to the script that after the conversion will delete which ever ends up being the larger file. Not entirely sure how to best set that up at the end of each conversion.

  pushd "%2"
  
  
  
  ::Default variables
  
  SET paths=paths.txt
  
  ::paths lets you put a bunch of folder paths in a text file and run this across those, instead of individually. I use this to run overnight on a LOT of footage folders at once. Thanks to Aayla for a lot of these upgrades
  
  ::Fun tip - select your folders (15 max at a time) and shift+rig-!click and click "copy as paths"
  
  SET /A ffmpeg_qv=24
  
  ::change CQP value here so you only have to type it once. 22 is lossless for HEVC.
  
  
  
  ::for /R %%A in (*.mp4, *.avi, *.mov, *.wmv, *.ts, *.m2ts, *.mkv, *.mts) do (
  
  ::    echo Processing %%A
  
  ::    ffmpeg -hwaccel auto -i "%%A" -pix_fmt p010le -map 0:v -map 0:a -c:v hevc_nvenc -rc constqp -qp 21 -b:v 0K -c:a libfdk_aac -vbr 5 -movflags +faststart "%%A~dnpA_CRF%ffmpeg_qv%_HEVC.mp4"
  
  ::    echo Processed %%A
  
  ::)
  
  ::pause
  
  ::Test if the paths file exists and iterate through it
  
  if EXIST %paths% (
  
      for /f "tokens=*" %%a in (%paths%) do (
  
          echo Changing to directory %%a
  
          pushd "%%a"
  
          CALL :ffmpeg
  
      )
  
  ) else (
  
      ::It doesn't exist
  
      CALL :ffmpeg
  
  )
  
  pause
  
  EXIT /B %ERRORLEVEL%
  
  ::Don't run the function when they're first defined because that's a thing Batch does for some reason???
  
  :ffmpeg
  
      for /R %%A in (*.mp4, *.avi, *.mov, *.wmv, *.ts, *.m2ts, *.mkv, *.mts) do (
  
          echo Processing "%%A"
  
          ffmpeg -hwaccel auto -i "%%A" -pix_fmt yuv420p -map 0:v -map 0:a -map_metadata 0 -c:v hevc_nvenc -rc constqp -qp %ffmpeg_qv% -b:v 0K -c:a aac -b:a 128k -movflags +faststart -movflags use_metadata_tags "%%A~dnpA_CRF%ffmpeg_qv%_HEVC.mp4"
  
          :: "-map_metadata 0" copies all metadata from source file
  
          :: "-movflags +faststart" helps with audio streaming
  
          echo Processed %%A
  
          :: echo inFile %%A outFile %%A~dnpA_CRF%ffmpeg_qv%_HEVC.mp4
  
          :: code here to check if A>B or B<a then="then" delete="delete" the="the" larger="larger" of="of" two="two" goto="goto"></a>code>