av1 frameblender script [nvidia only]

<# : batch portion
::mode con: lines=5
@echo off & (for %%I in (%*) do @echo(%%~I) | ^
PowerShell.exe -noexit -noprofile -command "$argv = $input | ?{$_}; iex (${%~f0} | out-string)"
exit /b
: end batch / begin powershell #>

$OUTPUT_FPS = 60

# Force AV1 NVENC with audio copy
$enc_args = "-c:v av1_nvenc -preset p5 -cq 20 -c:a copy"

if ($isLinux -or $PSScriptRoot) {
    $argv = $args
}

$argv | ForEach-Object {

    # Probe input video metadata
    $Metadata = ((ffprobe.exe -v quiet -print_format json -show_format -show_streams -i $($_.trim())) | ConvertFrom-Json).Streams
    $VideoFPS = Invoke-Expression $($Metadata.avg_frame_rate | Select-Object -First 1)

    $item = Get-Item $_
    $basename = $item.BaseName -replace "\.$"

    $Out = Join-Path $item.Directory.FullName ($basename + '-TMIX.MP4')
    $frames = $($VideoFPS / $OUTPUT_FPS)
    Write-Host "tmixing $basename`: $VideoFPS/$frames=$OUTPUT_FPS"

    # Build ffmpeg command
    $arguments = "ffmpeg -hide_banner -loglevel warning -stats -hwaccel cuda -i `"$($item.FullName)`" -vf tmix=frames=$frames`:weights=1 -r $OUTPUT_FPS $enc_args `"$Out`" -y"
    Invoke-Expression $arguments

    if ($LASTEXITCODE -ne 0) {
        ''
        Write-Host 'Something went wrong, pausing..' -ForegroundColor Red
        ''
        pause
    }
}

exit