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• Limit number of Start-Process running in poweshell

  7 mars 2018, par Ahhhhhhhhhhhhhdfgbv

  I have tried to limit the number of Start-Process running from a Powershell, but I can’t seem to get it to work.

  I tried to follow this process : https://exchange12rocks.org/2015/05/24/how-to-limit-a-number-of-powershell-jobs-running-simultaneously/ and Run N parallel jobs in powershell

  But these are for Jobs not Processes, and I would like to remove the -Wait from the Start-Process

  My concern with the script is that if there are 1000 audio files in the folder, then FFMpeg would crash the system.

  ---

  # get the folder for conversion
  
  function mbAudioConvert {
  
      [Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") | Out-Null
  
      [System.Windows.Forms.Application]::EnableVisualStyles()
  
  
  
      $fileBrowser = New-Object System.Windows.Forms.FolderBrowserDialog
  
      $fileBrowser.SelectedPath = "B:\"
  
      $fileBrowser.ShowNewFolderButton = $false
  
      $fileBrowser.Description = "Select the folder with the audio which you wish to convert to Avid DNxHD 120 25P 48kHz"
  
  
  
      $mbLoop     = $true
  
      $mbCount    = 0001
  
      $mbMaxJob   = 4
  
  
  
      while( $mbLoop ) {
  
          if( $fileBrowser.ShowDialog() -eq "OK" ) {
  
              $mbLoop     = $false
  
  
  
  
  
              $mbImage    = ( Get-Item -Path "C:\Users\user\Desktop\lib\AudioOnly.jpg" )
  
              $mbff32     = ( Get-Item -Path "C:\Users\user\Desktop\lib\ffmpeg32.exe" )
  
              $mbff64     = ( Get-Item -Path "C:\Users\user\Desktop\lib\ffmpeg64.exe" )
  
  
  
              $mbFolder   = $fileBrowser.SelectedPath
  
              $mbItemInc  = ( ls $mbFolder\* -Include *.mp3, *.MP3, *.wav*, *.WAV*, *.ogg, *.OGG, *.wma, *.WMA, *.flac, *.FLAC, *.m4a, *.M4a )
  
              $mbProgress = ( Get-ChildItem -Path $mbItemInc )
  
  
  
              $mbHasRaw   = ( $mbFolder + "\RAW" )
  
  
  
              if( !( Test-Path -Path $mbHasRaw ) ) {
  
                  # force create a RAW folder if it does not exist
  
                  New-Item -ItemType Directory -Force -Path "$mbHasRaw"
  
              }
  
  
  
  
  
              foreach( $mbItem in $mbItemInc ) {
  
  
  
                  $mbCheck    = $false
  
  
  
                  # output the progress
  
                  # Suggestion: You might want to consider updating this after starting the job and do the final update after running ex. Get-Job | Wait-Job to make the progress-bar stay until all processes are finished
  
                  #Write-Progress -Activity "Counting files for conversion" -status "Currently processing: $mbCount" -percentComplete ($mbCount / $mbItemInc.count*100)
  
  
  
                  # limit the run number
  
                  while ($mbCheck -eq $false) {
  
  
  
                      if( (Get-Job -State 'Running').count -lt $mbMaxJob) {
  
  
  
                          $mbScriptBlock = {
  
                              $mbItemName = $using:mbItem.BaseName
  
  
  
                              $mbNewItem  = ( $using:mbFolder + "\RAW\" + $mbItemName + ".mov" )
  
                              $mbArgs     = " -loop 1 -i $using:mbImage -i $using:mbItem -shortest -c:v dnxhd -b:v 120M -s 1920x1080 -pix_fmt yuv422p -r 25 -c:a pcm_s16le -ar 48k -af loudnorm=I=-12 $mbNewItem"
  
  
  
                              Start-Process -FilePath $using:mbff32 -ArgumentList $mbArgs -NoNewWindow -Wait
  
                          }
  
  
  
                          Start-Job -ScriptBlock $mbScriptBlock
  
  
  
                          #The job-thread doesn't know about $mbCount, better to increment it after starting the job
  
                          $mbCount++
  
                          $mbCheck  = $true          
  
                      }
  
  
  
                  }
  
              }
  
  
  
          } else {
  
  
  
              $mbResponse = [System.Windows.Forms.MessageBox]::Show("You have exited out of the automation process!", "User has cancelled")
  
              if( $mbResponse -eq "OK" ) {
  
                  return
  
              }
  
          }
  
      }
  
  
  
      $fileBrowser.SelectedPath
  
      $fileBrowser.Dispose()
  
  }
  
  
  
  # call to function
  
  mbAudioConvert

• 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).

• Limit number of Start-Process running in powershell

  4 mai 2018, par Ahhhhhhhhhhhhhdfgbv

  I have tried to limit the number of Start-Process running from a Powershell, but I can’t seem to get it to work.

  I tried to follow this process : https://exchange12rocks.org/2015/05/24/how-to-limit-a-number-of-powershell-jobs-running-simultaneously/ and Run N parallel jobs in powershell

  But these are for Jobs not Processes, and I would like to remove the -Wait from the Start-Process

  My concern with the script is that if there are 1000 audio files in the folder, then FFMpeg would crash the system.

  ---

  # get the folder for conversion
  
  function mbAudioConvert {
  
      [Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") | Out-Null
  
      [System.Windows.Forms.Application]::EnableVisualStyles()
  
  
  
      $fileBrowser = New-Object System.Windows.Forms.FolderBrowserDialog
  
      $fileBrowser.SelectedPath = "B:\"
  
      $fileBrowser.ShowNewFolderButton = $false
  
      $fileBrowser.Description = "Select the folder with the audio which you wish to convert to Avid DNxHD 120 25P 48kHz"
  
  
  
      $mbLoop     = $true
  
      $mbCount    = 0001
  
      $mbMaxJob   = 4
  
  
  
      while( $mbLoop ) {
  
          if( $fileBrowser.ShowDialog() -eq "OK" ) {
  
              $mbLoop     = $false
  
  
  
  
  
              $mbImage    = ( Get-Item -Path "C:\Users\user\Desktop\lib\AudioOnly.jpg" )
  
              $mbff32     = ( Get-Item -Path "C:\Users\user\Desktop\lib\ffmpeg32.exe" )
  
              $mbff64     = ( Get-Item -Path "C:\Users\user\Desktop\lib\ffmpeg64.exe" )
  
  
  
              $mbFolder   = $fileBrowser.SelectedPath
  
              $mbItemInc  = ( ls $mbFolder\* -Include *.mp3, *.MP3, *.wav*, *.WAV*, *.ogg, *.OGG, *.wma, *.WMA, *.flac, *.FLAC, *.m4a, *.M4a )
  
              $mbProgress = ( Get-ChildItem -Path $mbItemInc )
  
  
  
              $mbHasRaw   = ( $mbFolder + "\RAW" )
  
  
  
              if( !( Test-Path -Path $mbHasRaw ) ) {
  
                  # force create a RAW folder if it does not exist
  
                  New-Item -ItemType Directory -Force -Path "$mbHasRaw"
  
              }
  
  
  
  
  
              foreach( $mbItem in $mbItemInc ) {
  
  
  
                  $mbCheck    = $false
  
  
  
                  # output the progress
  
                  # Suggestion: You might want to consider updating this after starting the job and do the final update after running ex. Get-Job | Wait-Job to make the progress-bar stay until all processes are finished
  
                  #Write-Progress -Activity "Counting files for conversion" -status "Currently processing: $mbCount" -percentComplete ($mbCount / $mbItemInc.count*100)
  
  
  
                  # limit the run number
  
                  while ($mbCheck -eq $false) {
  
  
  
                      if( (Get-Job -State 'Running').count -lt $mbMaxJob) {
  
  
  
                          $mbScriptBlock = {
  
                              $mbItemName = $using:mbItem.BaseName
  
  
  
                              $mbNewItem  = ( $using:mbFolder + "\RAW\" + $mbItemName + ".mov" )
  
                              $mbArgs     = " -loop 1 -i $using:mbImage -i $using:mbItem -shortest -c:v dnxhd -b:v 120M -s 1920x1080 -pix_fmt yuv422p -r 25 -c:a pcm_s16le -ar 48k -af loudnorm=I=-12 $mbNewItem"
  
  
  
                              Start-Process -FilePath $using:mbff32 -ArgumentList $mbArgs -NoNewWindow -Wait
  
                          }
  
  
  
                          Start-Job -ScriptBlock $mbScriptBlock
  
  
  
                          #The job-thread doesn't know about $mbCount, better to increment it after starting the job
  
                          $mbCount++
  
                          $mbCheck  = $true          
  
                      }
  
  
  
                  }
  
              }
  
  
  
          } else {
  
  
  
              $mbResponse = [System.Windows.Forms.MessageBox]::Show("You have exited out of the automation process!", "User has cancelled")
  
              if( $mbResponse -eq "OK" ) {
  
                  return
  
              }
  
          }
  
      }
  
  
  
      $fileBrowser.SelectedPath
  
      $fileBrowser.Dispose()
  
  }
  
  
  
  # call to function
  
  mbAudioConvert