Convert AVIF to JPG in PowerShell with ImageMagick

avif-to-jpg.ps1

# Single thread
Get-ChildItem -LiteralPath . -Filter *.avif | ForEach-Object {
    $jpgFileName = [System.IO.Path]::ChangeExtension($_.Name, '.jpg')
    magick convert $_.FullName $jpgFileName
}

# Or parallel
$scriptBlock = {
    param($inputFile)
    $outputFile = [System.IO.Path]::ChangeExtension($inputFile, '.jpg')
    magick convert $inputFile $outputFile
}

$maxConcurrentJobs = [Environment]::ProcessorCount
$jobs = @()

Get-ChildItem -LiteralPath . -Filter *.avif | ForEach-Object {
    if ($jobs.Count -ge $maxConcurrentJobs) {
        $finishedJob = Wait-Job -Job $jobs -Any
        Receive-Job -Job $finishedJob
        $jobs = $jobs | Where-Object { $_.State -ne 'Completed' }
    }
    $job = Start-Job -ScriptBlock $scriptBlock -ArgumentList $_.FullName
    $jobs += $job
}

# Wait for all jobs to complete and receive their output
Get-Job | Wait-Job
Get-Job | Receive-Job

# Clean up the job objects
Get-Job | Remove-Job