param (
    [Parameter(Mandatory = $true, ValueFromPipeline = $true)] $files,
    [Parameter(Mandatory = $false)] [string] $destination,
    [Parameter(Mandatory = $false)] [int] $quality = 22,
    [Parameter(Mandatory = $false)] [string] $preset = "fast",
    [switch] $force
)

$forceArgument = ""
if ($force.IsPresent) {
    Write-Host "Setting force argument."
    $forceArgument = "-y"
}
    
$nice = "/usr/bin/nice"
$ffmpeg = "/usr/bin/ffmpeg"

if ($destination -eq $null) {
    $destination = Get-Location
}

$files | ForEach-Object {
    $destinationFile = [IO.Path]::Combine($destination, $_.Name.Replace("264", "265"))
    $destinationFile = [IO.Path]::ChangeExtension($destinationFile, ".mkv")
    New-Object -TypeName PSObject |
    Add-Member -PassThru -MemberType NoteProperty -Name Source -Value $_.FullName |
    Add-Member -PassThru -MemberType NoteProperty -Name Target -Value $destinationFile
} |
ForEach-Object {
    $targetExists = [IO.File]::Exists($_.Target)

    if ($targetExists) {
        Write-Host "Target file exists: $($_.Target)"
        if ($force.IsPresent) {
            Write-Host "Forcing overwrite."
        }
    }
    else {
        Write-Host "Target file does not exist: $($_.Target)"
    }

    if (($force.IsPresent) -or (-not $targetExists)) {
        #$arguments = "$forceArgument -i ""$($_.Source)"" -map_metadata 0 -map 0 -c:a copy -c:s copy -c:v libx265 -crf $quality -preset $preset ""$($_.Target)"""
        $arguments = "$forceArgument -i ""$($_.Source)"" -map_metadata 0 -map 0 -c copy -c:v libx265 -crf $quality -preset $preset ""$($_.Target)"""
        Write-Host "$nice $ffmpeg $arguments"
        #& $nice $ffmpeg $forceArgument -i "$($_.Source)" -map_metadata 0 -map 0:a:0 -c:a copy -map 0:s:0? -c:s copy -map 0:v:0 -c:v libx265 -crf $quality -preset $preset "$($_.Target)"
        & $nice $ffmpeg $forceArgument -i "$($_.Source)" -map_metadata 0 -map 0 -c copy -c:v libx265 -crf $quality -preset $preset "$($_.Target)"
    }
}