Easy and intermediate cover your initial question. Hard is present in the video if I'm interpreting what I see correctly and it may eventually kill the set.
The dirty tuner issue should affect the picture regardless of the signal source.
Rolling bars in the video that you don't see in person are called shutter bars....they are caused by the frequency and phase of the video camera shutter and the vertical sweep of the TV being out of sync.
Tons of small lines are a related phenomenon called moire. This explanation is more funny than anything I can come up with.
https://xkcd.com/1814/