Simple ffmpeg one liner

ffmpeg example

# With a specific codec

-i input
-codec:v video codec to use, most modern is libx265
# libx265 is slower but provides a smaller file size output, by default is usually
# libx264 which is the most compatible, faster than x265 but with a bigger file output

$ ffmpeg -i video.mov -codec:v libx265 video.mp4

# Simplest version

$ ffmpeg -i video.mov video.mp4