replace the video codec of an mp4

[blanc]

Hi,

How can I replace the video codec of an mp4 file with another with ffmpeg?

[jagabo]

Something like

ffmpeg -i input.mp4 -c:v (video codec) (codec settings) -c:a copy output.mp4

For example:

ffmpeg -i input.mp4 -c:v libx264 -preset slow -crf 18 -c:a copy output.mp4