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pixelization during high-activity MPEG-4 recordings

614 Views 5 Replies 6 Participants Last post by  rudeney
I'm seeing bouts pixelization during HD MPEG-4 recordings that have high levels of action; this typically does not effect the whole display, just the subsection with the highest level of movement. My signal levels on both tuners are in the mid-80's to low 90's. Is this caused by overcompression of the recording on my HR21?
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pcweltz said:
I'm seeing bouts pixelization during HD MPEG-4 recordings that have high levels of action; this typically does not effect the whole display, just the subsection with the highest level of movement. My signal levels on both tuners are in the mid-80's to low 90's. Is this caused by overcompression of the recording on my HR21?
I noticed the same thing. Twice on ESPN (Sunday NASCAR and NFL game tonight) the picture would pixelate/freeze for a second.
darekd said:
I noticed the same thing. Twice on ESPN (Sunday NASCAR and NFL game tonight) the picture would pixelate/freeze for a second.
I have also notice the same thing. Tonight during the the ESPN NFL game and Sunday during the NASCAR race. I thought it was something wrong with my setup.
darekd said:
I noticed the same thing. Twice on ESPN (Sunday NASCAR and NFL game tonight) the picture would pixelate/freeze for a second.
Usually a sign of overcompression/low bitrates. Compression has a tougher time with fast changes than steady color.

You can replicate this on a PC with Divx or ffdshow and playing with the encoding parameters.
Bushwacr said:
Usually a sign of overcompression/low bitrates. Compression has a tougher time with fast changes than steady color.

You can replicate this on a PC with Divx or ffdshow and playing with the encoding parameters.
And this problem could be coming from anywhere in the signal chain. From ESPN, from ESPN's signal distribution, the DirecTV encoders, the stat muxes or somwhere else in the processing chain. If it happens regularly, ESPN/DirecTV are going to have to look for the source.
I was seeing this a while back on our HD locals. In fact, the first year I had the HR20 (2006), our CBS affiliate was the worst, and of course ever college football game I wanted to watch was on CBS! I called and complained almost continuously to both D* and the local station (they each pointed fingers at the other) until it got resolved.
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