Embed subtitles (e.g., .ass) into MKV files and force the display of the subtitles

mkv_embed_subs.ps1

# Define the path to mkvmerge.exe
$mkvmergePath = "C:\mkvmerge.exe"
$outputFolder = "Out"

# Create the output folder if it doesn't exist
if (-not (Test-Path -Path $outputFolder)) {
    New-Item -ItemType Directory -Path $outputFolder
}

# Loop through all .mkv files in the current directory
Get-ChildItem -Path . -Filter *.mkv | ForEach-Object {
    $inputFile = $_.FullName
    $subtitleFile = ($_.BaseName + ".ass")
    $outputFile = Join-Path -Path $outputFolder -ChildPath $_.Name
	
    if (-not (Test-Path $subtitleFile)) {
        Write-Warning "Subtitle file not found for $inputFile. Skipping..."
        continue
    }
	
    # Run mkvmerge to embed subtitles
    & $mkvmergePath `
        --output $outputFile `
        --forced-display-flag 2:yes `
        $inputFile $subtitleFile
}