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Interesting! I figured I wasn't the only one who sees it. I was watching a game on Directv and thought it was odd that the picture was normal, so I guess I've come to expect the macroblocking. Tried with an antenna and the picture was perfect. I wonder if it occurred during the HD downgrade to 720p or if it was like that prior to that. Would be great if Comcast fixed it.
Has anyone else noticed macroblocking issues on WXIA HD, NBC in Atlanta? I checked using an antenna and it's fine, but on Xfinity 806/1011 it's defnitely noticeable with motion, especially football. No other channels seem to have this issue.