Script to remux video files to mp4

MakeMP4.ps1

function makemp4 {
    # List of supported video file extensions, including 3G2
    $extensions = @("*.mkv", "*.avi", "*.mov", "*.3g2") # Add other extensions as needed

    # Display the supported formats at the start of the script.
    $formats = $extensions -replace "\*\.", "" -join ", "
    Write-Host "Supported formats: $formats"

    # Get all video files in the current directory that match the supported extensions.
    $videoFiles = Get-ChildItem .\* -Include $extensions

    # Print the list of files found for debugging
    Write-Host "Files found:" -ForegroundColor Yellow
    $videoFiles | ForEach-Object { Write-Host $_.FullName }

    # If no video files are found, print a message and stop the script.
    if ($videoFiles.Count -eq 0) {
        Write-Host "No video files found in the current directory." -ForegroundColor Red
        return
    }

    # Loop through each found video file and convert it to MP4 using FFmpeg.
    $videoFiles | ForEach-Object {
        try {
            # Define the output file name by appending .mp4 to the original file name (without extension).
            $output = "$($_.BaseName).mp4"

            # Check the audio codec of the file using FFmpeg.
            $audioCodec = ffmpeg -i $_.FullName 2>&1 | Select-String -Pattern "Audio: (\w+)" | ForEach-Object { $_.Matches.Groups[1].Value }

            # Decide whether to copy the audio stream or convert to AAC based on the codec.
            if ($audioCodec -eq "mp4a" -or $audioCodec -eq "qcelp" -or $audioCodec -eq "some_other_unsupported_codec") {
                # Convert audio to AAC if it's not supported by Windows or if it's QCELP.
                Write-Host "Converting audio codec from $audioCodec to AAC for file: $($_.Name)"
                ffmpeg -i $_.FullName -c:v copy -c:a aac $output *>&1 | Out-Null
            }
            else {
                # Copy both video and audio without re-encoding if the codec is supported.
                Write-Host "Copying video and audio streams for file: $($_.Name)"
                ffmpeg -i $_.FullName -c:v copy -c:a copy $output *>&1 | Out-Null
            }

            # Print a success message for each file converted.
            Write-Host "Converted: $($_.Name) to $output"
        }
        catch {
            # If there's an error during conversion, catch the error and display a message.
            Write-Host "Error converting: $($_.Name) - $_"
        }
    }
}