Because they occasionally eat small mammals (and insects).

There you go.

https://github.com/laylavish/uBlockOrigin-HUGE-AI-Blocklist

Cows are not vegans, though.

.mkv is just a container and can contain any encode. All my av1 encodes are .mkv files.

But the majority of my videos are in h264 for compatability, though I’ve been adding more av1 and h265 encodes lateley. But storage isn’t much of a concern for me.