问在powershell中运行的启动进程限制数

EN

#DemoValues
$mbItemInc = 1..10 | % { New-Item -ItemType File -Name "File$_.txt" }
$mbff32 = "something32"
$mbFolder = "c:\FooFolder"
$mbImage = "BarImage"
$mbMaxJob = 2
$mbCount = 0

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 = {

                 Param($mbItem, $mbFolder, $mbImage, $mbff32)
                #Filename without extension is already available in a FileInfo-object using the BaseName-property
                $mbItemName = $mbItem.BaseName

                $mbNewItem  = ( $mbFolder + "\RAW\" + $mbItemName + ".mov" )
                $mbArgs     = "-loop 1 -i $mbImage -i $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 $mbff32 -ArgumentList $mbArgs -NoNewWindow -Wait
            }

            Start-Job -ScriptBlock $mbScriptBlock -ArgumentList $mbItem, $mbFolder, $mbImage, $mbff32

            #The job-thread doesn't know about $mbCount, better to increment it after starting the job
            $mbCount++
            $mbCheck  = $true          
        }

    }
}

cls

$FormatNameJob="FFMPEG"
$maxConcurrentJobs = 100
$DirWithFile="C:\temp"
$DestFolder="C:\temp2"
$TraitmentDir="C:\temp\traitment"
$PathFFMpeg="C:\Temp\ffmpeg\ffmpeg\bin\ffmpeg.exe"
$HistoFolder="C:\temp\histo"

#create dir if dont exists
New-Item -ItemType Directory -Path $TraitmentDir -Force | Out-Null
New-Item -ItemType Directory -Path $DestFolder -Force | Out-Null
New-Item -ItemType Directory -Path $HistoFolder -Force | Out-Null


while ($true)
{
    "Loop File"

    $ListeFile=Get-ChildItem $DirWithFile -file -Filter "*.avi"

    if ($ListeFile.count -eq 0 )
    {
       Start-Sleep -Seconds 1
       continue 
    }

    #loop file to trait
    $ListeFile | %{

        while ((get-job -State Running | where Name -eq $FormatNameJob ).Count -ge $maxConcurrentJobs)
        {
            Start-Sleep -Seconds 1
            get-job -State Completed | where Name -eq $FormatNameJob | Remove-Job
        }

        "traitment file : {0}" -f $_.Name

        #build newname and move item into traitment dir
        $NewfileName="{0:yyyyMMddHHmmssfffff}_{1}" -f (get-date), $_.Name
        $ItemTraitment=[io.path]::Combine($TraitmentDir, $NewfileName)
        $mbNewItem  ="{0}.mov" -f [io.path]::Combine($DestFolder, $_.BaseName)
        Move-item $_.FullName -Destination $ItemTraitment

        #build arguments and command
        $mbArgs     = " -loop 1 -i $ItemTraitment -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"

        $ScriptBlock=[scriptblock]::Create("Start-Process $PathFFMpeg -ArgumentList $mbArgs -Wait")

        #add job
        Start-Job -ScriptBlock $ScriptBlock -Name $FormatNameJob
    }

}