Mass convert videos from one type to another

MassFFmpegConvert.ps1

# By default, this will convert all MP4 files in the specified directory to AV1-encoded MKV files.
# You can specify parameters to the command, or modify the default behavior below.
# Run `Get-Help MassFFmpegConvert.ps1` for more information.

param(
    [Parameter(Mandatory)]
    [String]$path = ".",
    [Parameter()]
    [String]$inputExtension = "mp4",
    [String]$outputExtension = "mkv",
    [String]$videoCodec = "libsvtav1",
    [String]$crf = "30",
    [String]$audioCodec = "copy",
    [Switch]$notRecursive,
    [Switch]$dryRun,
    [Switch]$deleteOriginal
)

$recursive = !$notRecursive

if (Get-Command ffpb -ErrorAction SilentlyContinue) { $executable = "ffpb" } else { $executable = "ffmpeg" }

$filesToConvert = Get-ChildItem $path\*.$inputExtension -Recurse:$recursive

$numFilesToConvert = $filesToConvert.Count

if ($numFilesToConvert -eq 0) {
    Write-Host "Searched for $inputExtension files, but couldn't find any!" -ForegroundColor Red
    exit
}

if ($inputExtension -eq $outputExtension) {
    Write-Host "You just tried to overwrite a file with itself. The input and output extensions can't be exactly the same!" -ForegroundColor Red
    exit
}

Write-Host "Transcoding $inputExtension to $outputExtension with c:v $videoCodec, CRF $crf, c:a $audioCodec" -ForegroundColor Blue

$vidNum = 0

foreach ($inputVid in $filesToConvert) {
    $outputVid = [io.path]::ChangeExtension($inputVid.FullName, ".$outputExtension")
    $vidNum += 1
    $percentProgress = [double][Math]::Ceiling(($vidNum/$numFilesToConvert)*100)
    Write-Progress -Activity "Transcoding in progress" -Status "$(Resolve-Path -Relative -LiteralPath $inputVid) ($vidNum/$numFilesToConvert)" -PercentComplete $percentProgress
    if (!$dryRun) {
        & $executable -hide_banner -hwaccel auto -i $inputVid.FullName -c:v $videoCodec -c:a $audioCodec -crf $crf -map_metadata 0 $outputVid
        if ($deleteOriginal) {
            Remove-Item $inputVid
        }
    }
}

Write-Host "Done! Follow me and leave a star if you liked this script. https://github.com/randomblock1" -ForegroundColor DarkGreen

<#

        .SYNOPSIS
        Transcode all files in a folder recursively with a given file extension.

        .DESCRIPTION
        Transcode all files in a folder recursively with a given file extension.
        Prints the name of each file it transcodes.
        Uses ffpb to display a progress bar if possible.

        .PARAMETER path
        Required. Specifies the folder path to recursively search for files.

        .PARAMETER inputExtension
        Specifies the extension. "mp4" is the default.

        .PARAMETER outputExtension
        Specifies the extension. "mkv" is the default.

        .PARAMETER videoCodec
        Specifies the video codec. "libsvtav1" is the default.

        .PARAMETER crf
        Specifies the constant rate factor. "30" is the default.

        .PARAMETER audioCodec
        Specifies the audio codec. "copy" is the default.

        .PARAMETER notRecursive
        Specifies if it should scan recursively for files. "false" is the default.

        .PARAMETER dryRun
        Specifies if it should perform a dry run. "false" is the default.

        .PARAMETER deleteOriginal
        Specifies if it should delete the original file after transcoding. "false" is the default.

        .INPUTS
        None.

        .OUTPUTS
        None.

        .EXAMPLE
        PS> MassFFMpegConvert -path .\Videos
        Transcoding mp4 to mkv with c:v libsvtav1, CRF 30, c:a copy
        Transcoding .\Videos\test.mp4
        test.mp4: 100%|#############| 600/600 [00:05<00:00, 120.0 frames/s]
        Done! ✅

        .EXAMPLE
        PS> MassFFMpegConvert -path .\Videos -inputExtension webm -outputExtension mp4 -videoCodec libx264 -crf 20 -audioCodec aac
        Transcoding webm to mp4 with c:v libx264, CRF 20, c:a aac
        Transcoding .\Videos\test.webm
        test.webm: 100%|#############| 600/600 [00:05<00:00, 120.0 frames/s]
        Done! ✅

        .EXAMPLE
        PS> MassFFMpegConvert -path .\Videos -dryRun
        Transcoding mp4 to mkv with c:v libsvtav1, CRF 30, c:a copy
        Transcoding .\Videos\test.mp4
        Done! ✅

        # Notice how nothing is actually transcoded. It's just a dry run.

        .LINK
        https://github.com/randomblock1

#>