This doesn't look like it is a pure performance issue. VM CPU and RAM usage never climbed above 55%, overall server IO delay never got above 8%, normally staying between 0-4 %. Below is a shot from Spider man 2, someone just ran past the camera.
There were defects similar to what you would expect using an antenna on a cloudy day or with a bad cable. When I tried to do the same thing with an ubuntu server VM (4GB ram 2 cores), everything seemed to go smoothly, except the video came through degraded. I was able to do this successfully when my server was running windows on bare metal. My goal is to run plex (and later on, jellyfin, but let's not worry about that for now) with a simple USB tuner hooked up to cable. I'll try to present what I've tried, and what problems I am running into as concisely as possible. Over the course of working on this, I've seen some symptoms I don't understand.
I've been working on this for awhile, and I've tried a lot of solutions. I am having some trouble getting my USB tuner to work properly.