Index

Common Commands

Rescale

ffmpeg -i input.mp4 -vf scale=w:h output.mp4

Reencode in different contant rate factor

ffmpeg -i input.mp4 -vcodec libx264 -crf 28 output.mp4

Note

The range of the quantizer scale is 0-51: where 0 is lossless, 23 is default, and 51 is worst possible. A lower value is a higher quality and a subjectively sane range is 18-28. Consider 18 to be visually lossless or nearly so: it should look the same or nearly the same as the input but it isn't technically lossless.