[Dalewyn]

>4k

To be pedantic, OP specified "HD" which is 720p. I gave him benefit of the doubt by saying "high resolution" in my reply, but I think 4K is unreasonable given the provided context. I'd wager 1080p ("Full HD") at most. There's also the question of frame rate, though we can probably safely assume either 29.976 or 59.952 fps since it's Youtube.

As an aside, software decoding performance can vary pretty significantly depending on the codec used for both encoding and decoding. Bit of a history lesson, CoreAVC was infamous for being very easy on the CPU compared to other h.264 decoders like ffmpeg.

[irundebian]

Correction: I think I experienced noticeable stutters with Full HD videos not with HD videos.

[pgaddict]

I occasionally see stutters too, even with Full HD video. Or more precisely, mplayer complained about slowness and having to drop frames.

It often helped to actually give the VM more cores (not just the default 2), but sometimes it was due to some weirdo codec/quality setting, and recoding the video just solved it. Sometimes switching to vlc (from mplayer) helped. Other times it was simply due to the sys-usb vm being overloaded.

[fsflover]

https://forum.qubes-os.org/t/hd-video-playback-on-qubes-os-o...