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Not as far as I know, but you can change the fps of your source in that case. Use ffmpeg or eac3to for speeding up the audio and prass for...

Edit: The same happens when using xysubfilter

Well, I don't know if it's in the Matroska specification. However, I noticed that mpv had the same bug in an older build (https://github.com/mpv-player/mpv/pull/6019) and it got fixed. But thanks,...

https://github.com/mpv-player/mpv/issues/6503 That one here downloads fine for me.

Yeah, some of the features are probably demanding a lot of time. After all, these are just requests/suggestions to improve the tool. Here is an example for what I mean...