FFMPEG 4K/UltraHD Encoding Cheatsheet FFMPEG 4K/UltraHD Encoding Cheatsheet Jul 31, 2015 ffmpeg 4k 1080p 720p UltraHD cheatsheet 3840 4096 extract frame png y4m sequence Crop Real 4K to UltraHD 4096>3840 ffmpeg -i A001_C014_01217G.4k.y4m -vf "crop=3840:2160:128:0" outputgirl.2160p.