Short PowerShell script to generate GIF from video

ConvertTo-Gif.ps1

function ConvertTo-Gif {
    [CmdletBinding()]
    param (
        [ValidateScript( { test-path -LiteralPath $_ })]
        [Parameter(Mandatory = $true)]
        $File
    )
    begin {
        # Check if ffmpeg is installed
        $ffmpeg = Get-Command "ffmpeg.exe" -ErrorAction SilentlyContinue
        if ($null -eq $ffmpeg) {
            throw [System.IO.FileNotFoundException]::new("ffmpeg cannot be found. Please install ffmpeg then run this script again.")
        }
        $fileToBeProcessed = Get-Item -LiteralPath $File
    }
    process {
        $duration = ffprobe -v error -select_streams v:0 -show_entries stream=duration -of default=noprint_wrappers=1:nokey=1 `"$fileToBeProcessed`"
        $rngSeek = get-random -Minimum 0.4 -Maximum 0.8
        $targetPoint = [math]::floor([decimal]::Multiply($duration, $rngSeek))
        $targetDuration = 5
        $targetFilename = "$($fileToBeProcessed.basename)-$targetPoint-$targetDuration.gif"
        ffmpeg -ss $targetPoint -t $targetDuration -i `"$fileToBeProcessed`" -vf "fps=18,scale=600:-1,split [o1] [o2];[o1] palettegen=stats_mode=diff [p]; [o2] fifo [o3];[o3] [p] paletteuse=dither=bayer:bayer_scale=5:diff_mode=rectangle" `"$targetFilename`" -y
    }
    end {
        # Start-Process $targetFilename
    }
}