Hi, I have a Roku Streaming Stick 4k and also have this issue. At first I couldn’t figure out the cause so I started a thread: Jerky video on Streaming Stick 4K - #5 by jaydee77ca
However I just narrowed it down to direct play with DTS and MKV container and that lead me to this thread. I’m happy it’s not some weird unique issue with my setup but I’m sad that it’s been an issue for a long time. Hopefully it gets resolved soon.
