How to convert a MKV video to a less CPU intensive video format?

How to convert a MKV video to a less CPU intensive video format? I have a couple of videos at 1920x800 that use the MKV format (4.7 GB). A friend of mine has an old PC that has some problems playing them; the CPU is working at nearly 100%.
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bert [Entry]

MKV is only the container, so that's not the problem. It is a question of the codec or the picture size. Processing large image sizes needs much more power than small images. So I think the problem here is rather the image size. Maybe you should try to resample it to 720p or even 576p.