====== Compress Canon EOS MOV videos to MKV (and save space)======

-- //Tested with **Ubuntu 18.04** on **March 2020**// --

We will use //ffmpeg// - if you have not already installed it, do it now with
  sudo apt install ffmpeg

I have tried a few combinations: from my experience, a good trade-off between quality, compression ratio, and speed is provided by using the //h264// video codec and //libvorbis// for audio.

To compress a video created with your camera, just type:
  ffmpeg -i MVI_0123.MOV -c:v h264 -c:a libvorbis MVI_0123.mkv

If you have multiple files inside your directory and you want to convert (and compress) all of them, you can use:
  for i in *.MOV; do ffmpeg -i "$i" -c:v h264 -c:a libvorbis "${i%.*}.mkv"; done

and... done!