![]() Use the slowest that you have patience for: ultrafast, superfast, veryfast, faster, fast, medium (the default), slow, slower, veryslow. A slower preset provides better compression (quality per file size) but is slower. If you are re-encoding impractically large inputs to upload to YouTube or similar then try a value of 17 or 18 since these video services will re-encode anyway. Use the highest value that still gives you an acceptable quality. Range is logarithmic 0 (lossless) to 51 (worst quality). ![]() movflags faststart -vf scale=-2:720,format=yuv420p output.mp4 MP4Īssuming you're using a recent version of ffmpeg: ffmpeg -i input -c:v libx264 -crf 23 -preset medium -c:a aac -b:a 128k \ If you prefer command-line you can use ffmpeg (or handbrake-cli).
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