Hey,
I watched a 720 mp4 last night and the video was stuttering and jittery. Audio always fine. I checked the some mkv’s I had and 720 & 1080 played no problem. What could be the issue?
Try remuxing the file.
That fixes 9 out of 10 problems as long as that’s the only movie you’re having trouble with.
https://mkvtoolnix.download/downloads.html
If it doesn’t and you need specific help with a specific movie, you have to be specific
Is it transcoding
What OS and CPU
What player
Local or remote stream
ect…