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• How to convert cmd pipe to powershell in context of binary data (ffmpeg and streamlink)

  20 juin, par Filip Krawczyk

  I'd like to convert a pipe of video stream between streamlink and ffmpeg from cmd to Powershell. But from what I searched powershell only supports piping objects.

  


  Is there any way to reproduce this in Powershell without using Start-Process -FilePath "cmd" -ArgumentList [...] ? I'd prefer not to use it because I need access to the exit code.

  


  streamlink $stream_url best -O | ffmpeg -i pipe: "output_file.mp4"


  


  note : the line above had some args removed for better clarity

  


• Revision 2939 : Ajouter la possibilité (activé à l’installation par défaut) d’ajouter ...

  20 février 2010, par kent1 — Log

  Ajouter la possibilité (activé à l’installation par défaut) d’ajouter automatiquement toute nouvelle rubrique dans la liste des rubriques disponibles. Un logo pour le CFG Quelques modifs dans les CFG

• How to get -vf to ffmpeg from powershell commandline without parsing

  10 mai 2018, par Tupsi

  I made a powershell function to recode video with some extra parameters. It basically makes a get-childitem in the directory and feeds every occurrence it finds to a foreach loop. This worked well as long as I have default values inside my function which gets fed to the ffmpeg string in the loop in case I do not provide anything on the commandline (like number of passes, audio quality etc.). Now I wanted to integrate the option to use the -vf ffmpeg filter option. My problem there is, that I usualy dont need that, so there is no sane default option I could use, so I can not have something like -vf $filteroption in my command line. So I am trying to figure out how to get that "-vf" inside the variable without powershell or ffmpeg screwing me over, because atm I get either the error of a missing - in what ffmpeg sees (I guess powershell parses this away) and when I \ escape the - I see it now in the ffmpeg line, but ffmpeg does not recognize it as single parameter.

  examples which work :

  &$encoder -hide_banner -i $i -c:v libvpx-vp9 -b:v 0 -crf $quality -tile-columns 6 -tile-rows 2 -threads 8 -speed 2 -frame-parallel 0 -row-mt 1 -c:a libopus -b:a $bitrate -af aformat=channel_layouts=$audio -c:s copy -auto-alt-ref 1 -lag-in-frames 25 -y $outfile;

  here I provide $quality, $audio etc. with powershell parameters to the function like -quality 31 -audio stereo and it all works.

  But now I need to get something like "-vf scale=1920:-1" or "" inside that line and that does not work with something like just this :

  &$encoder -hide_banner -i $i -c:v libvpx-vp9 -b:v 0 -crf $quality -tile-columns 6 -tile-rows 2 -threads 8 -speed 2 -frame-parallel 0 -row-mt 1 -c:a libopus -b:a $bitrate -af aformat=channel_layouts=$audio -c:s copy -auto-alt-ref 1 -lag-in-frames 25 -y $extra $outfile;

  when I call the function with : "RecodeVP9 -extra -vf scale=1920:-1" powershell takes away the -, if I try it with escaping the - with - ffmpeg whines about it saying that "Unable to find a suitable output format for ’-vf’". I also tried "" and "-" with similiar results. So it seems that either powershell screws me over or ffmpeg.

  So to sum it up :
  I need a way to get extra ffmpeg arguments WITH the parameter name itself from the powershell command line into my powershell function (like -vf scale=1920:-1).