[herdcall]

I think what you're seeing is due to bandwidth limitations: when the picture pans the info changes rapidly and places a bigger demand on the bandwidth, so streamed shows will suffer in quality and show pixelation. If this is what you're seeing, it has nothing to do with the content itself, it will be fine if you watch it directly from disk.

[eschneider]

This. Digital video sends a key frame every N frame and deltas in between (well, slightly more complicated...) Lose a frame or two due to bandwidth and you see motion tearing.

[oven9342]

I notice it on TV as well.