PowerShell script that converts all wav files in a folder (and subfolders) into flac format.

convert_to_flac.ps1

# Check if FFmpeg is installed
try {
    ffmpeg -version | Out-Null
} catch {
    Write-Error "FFmpeg is not installed or not in PATH. Please install FFmpeg first."
    exit 1
}

# Allow user to specify the root directory or use current directory as default
$rootDirectory = Read-Host "Enter the root directory path (press Enter to use current directory)"
if ([string]::IsNullOrWhiteSpace($rootDirectory)) {
    $rootDirectory = Get-Location
}

# Verify directory exists
if (-not (Test-Path $rootDirectory)) {
    Write-Error "Directory not found: $rootDirectory"
    exit 1
}

# Find all .wav files in all subdirectories
$wavFiles = Get-ChildItem -Path $rootDirectory -Filter *.wav -Recurse -File
$totalFiles = $wavFiles.Count

if ($totalFiles -eq 0) {
    Write-Host "No WAV files found in $rootDirectory"
    exit 0
}

Write-Host "Found $totalFiles WAV files to convert"
$currentFile = 0

foreach ($wav in $wavFiles) {
    $currentFile++
    # Define the output file with the same name but .flac extension
    $flacFile = $wav.FullName -replace "\.wav$", ".flac"

    Write-Progress -Activity "Converting WAV to FLAC" -Status "Processing $($wav.Name)" -PercentComplete (($currentFile / $totalFiles) * 100)

    try {
        # Convert using FFmpeg (with reduced output verbosity)
        $ffmpegCommand = "ffmpeg -i `"$($wav.FullName)`" `"$flacFile`" -y -loglevel error"
        Invoke-Expression $ffmpegCommand

        if (Test-Path $flacFile) {
            Write-Host "Successfully converted: $($wav.Name)"
            
            # Uncomment the following line to delete original WAV files
            Remove-Item $wav.FullName -Force
        } else {
            Write-Warning "Failed to convert: $($wav.Name)"
        }
    } catch {
        Write-Error "Error converting $($wav.Name): $_"
    }
}

Write-Progress -Activity "Converting WAV to FLAC" -Completed
Write-Host "Conversion complete!"