Chrome doesn't play publicly shared mkv files

[MorrisJobke]

• see dont set the mimetype on public video previews #605 for a potential fix that needs to be addressed in a different way

cc @icewind1991 @rullzer

[enoch85]

I experience this issue. Any update here?

[juliusknorr]

Seems like a common workaround is to have video/webm as type for mkv files, since webm is a subset of mkv. This is also what files_videoplayer is using, so it is working with that. Maybe we should just extend the app to also use video.js on public sharing pages.

[rullzer]

@juliushaertl yes please! Less duplicated code!

[MorrisJobke]

Fixed via #7985