· I used to be a rocket scientist
I see occasional glitches on our local CBS MPEG4 HD local, whereas I almost NEVER see them on the MPEG2 national HD channels - ESPN HD, Universal HD, Discovery HD, TNT HD . . . all have just about perfect picture and sound for me (though I did note some dropouts and pixelation on some episodes of The X Files that I recorded on TNT HD this past weekend and watched yesterday, which was a first. They were repeatable when I trick-played back and forth, so I think they were transmission glitches in the MPEG2 streams rather than glitches in playback. Other MPEG2 HD recordings made around the same time from other channels worked fine.