Aug 2017

As well as transcoding video, we can rescale video, handy for converting HD to SD or UHD to HD. Rescaling can be done when transcoding, or as a step on its own. Please note, if you want to play video back at a certain size, ffplay can rescale the output video, without destroying the source.

This is how to rescale the video, where you specify the framesize:

  ffmpeg -i input.mov -vf scale=320:240 output.mov