Encode / scale / pad gameplay recordings

ffmpeg -i '/run/media/lucifer/0d6b70fa-0c49-47d6-84c1-3f8509d52b58/simplescreenrecorder/simplescreenrecorder-2020-03-25_19.49.49.mkv' -vf "scale=-1:1080,pad=1920:1080:(ow-iw)/2:(oh-ih)/2" -c:v libx264 -crf 18 -preset placebo -tune grain -c:a flac wolfenstein_3d_gameplay.mkv