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• In Command Line, how do I use a constant set by a nested For ?

  20 octobre 2016, par Neo Herakles

  Is it possible to set a variable through a For and then use its value ? I’m using two For, one to move across a whole folder and the other one to get the value I desire, the issue here is, the operation done by %watermark% doesn’t recognize the value of %duration%, I believe it’s trying the set the constant and then do the operation simultaneously and that’s why there’s no value, could you please tell me how to pass the variable’s value to duration ?

  @echo off
  
  setlocal
  
  for %%G in ("%~dp0\water\*.mp4") do (
  
      for /F "delims=" %%I in ('ffprobe.exe -v error -show_entries format^=duration -of default^=noprint_wrappers^=1:nokey^=1 %%I 2^>^&1') do (
  
      set "duration=%%I"
  
      ffmpeg.exe -i "%%G" -i Watermark.png -filter_complex "[0:v]scale=iw:ih[v0];[1:v][v0]scale2ref=iw/6:ih/10[logo][0v];[0v][logo]overlay=W-w-3:H-h-3:enable='between(t,%duration%/3,(%duration%/3)+2)'[v]" -map "[v]" -map 0:a -codec:v libx264 -preset ultrafast -crf 23 -codec:a copy "%~dp0\out\%%~nG.mp4"
  
      )
  
  )
  
  endlocal
  
  pause

  The output for this is Undefined constant or missing '(' in '/3)+2)so it’s definetely the constant the issue here.
  Thanks for the help.

  Edit : SOLVED, the solution was to use %%I instead of %duration%

• Generating thumbnails from multiple videos on Desktop, using ffmpeg, or something similar

  6 février 2013, par Birk

  Hi guys this is a long shot but here goes...

  I basically have what I mentioned in the title running on my server. When I upload a video ffmpeg decomplies it and gives me screenshots, then I pick a screenshot that I want to use for that video. Currently, my server can process 3 videos at a time. The down side is that this uses up A LOT of the server processing power. :(

  Is there a way, or a program, that can process several video at a time and generate me screenshots on my Desktop ? If this is possible then I can just use my spare computer here to process everything then upload the screenshots/video to my server.

  This is what I basically have running now on the server. kayweb.com.au/blogs/Web-Development/Generating-screenshots-using-FFmpeg

  Something like this, But this thumbnail generator puts everything into one image. I need to be able to choose with thumbnail I want to use.
  http://www.tothepc.com/archives/make-movie-caps-screenshots-with-free-video-thumbnails-maker/

  Anyone have any suggestions ?

• Add two commands in ffmpeg

  12 juillet 2017, par Parikshit.S.Shekhawat

  I am using two commands, one to set size of frames and other to add water mark to left top corner

  This command set size of frames to 720*1280

  String[] complexCommandOne = "-y" ,"-i", path,"-strict","experimental", "-vf", "scale=720:1280","-preset", "ultrafast", output ;

  Below command add watermark to above output file

  String[] complexCommandTwo = {"-y" ,"-i", output,"-strict","experimental", "-vf", "movie="+pngpath+" [watermark]; [in][watermark] overlay=x=10:y=10 [out]","-s", "720x1280","-r", "30", "-b", "15496k", "-vcodec", "mpeg4","-ab", "48000", "-ac", "2", "-ar", "22050","-preset", "ultrafast", fileName} ;

  Both these commands take 3-5 minutes on 20 seconds video

  I want to merge these so that time can be reduced.

  Any help. I am new i Ffgmeg