I was watching "The Antiques Road Show" last night in full screen. (1280x800).
About once a minute the screen seemed to subtly change, the stream would "rewind" by 1 or 2 seconds and the sound level would go up.
So I would reduce the sound only to find that after another minute it would revert back to it's original level.
I gave up and watched it in normal size with no problems.
Was it trying to jump into high definition? I don't usually watch HD because my download speed is not quite fast enough.

This is the first time this has happened. Using Ubuntu 12.10 and FF23.0
Blackadder played OK in full screen but I presume it has no HD version.
Any one else seen this problem?