param (
    [Parameter(Mandatory = $true)][string]$inputFolder
)

Get-ChildItem -File -Recurse $inputFolder  | ForEach-Object {
    $fullName = $_.fullname
    $cmdOutput = ffmpeg -i "$fullName" 2>&1
    #if no video or no audio, skip
    $hasVideo = $cmdOutput|Select-String -Pattern "Video:"
    $hasAudio = $cmdOutput|Select-String -Pattern "Audio:"
    if ($hasVideo -and $hasAudio) {
        #Is already h264
        $VideoCodec = "copy"
        $AudioCodec = "copy"
        $Video = $cmdOutput|Select-String -Pattern "Video:"|Select-String -Pattern "h264"
        if (!$Video) {
            $VideoCodec = "libx264"
        }

        $Video = $cmdOutput|Select-String -Pattern "Video:"|Select-String -Pattern "High 10"
        if ($Video) {
            $VideoCodec = "libx264"
        }


        $Audio = $cmdOutput|Select-String -Pattern "Audio:"|Select-String -Pattern "aac"
        if (!$Audio) {
            $AudioCodec = "aac"
        }

        "$VideoCodec $AudioCodec $fullName"
        #is Already AAC
        if ($AudioCodec -ne "copy" -or $VideoCodec -ne "copy") {
            $newName = "$fullName.converted.avi"
            ffmpeg -i "$fullName" -y -f mp4 -acodec $AudioCodec -ab 192k -ac 2 -absf aac_adtstoasc -async 2  -vcodec $VideoCodec -vsync 0 -level 4.1 -qmax 22 -qmin 20 -x264opts no-cabac:ref=2 -threads 0 $newName
            Remove-Item -Path "$fullName"
            Rename-Item -Path $newName $fullName
        }
    }
}