Comcast has said it can pack three high-definition signals into space typically used for two—without viewers noticing a drop in quality. But at least one viewer has.
A member of AVS Forum, a community site for audio/video enthusiasts, has posted the results of his comparison of the compression rates for 10 HD channels offered by Comcast and Verizon Communications’ FiOS TV in Northern Virginia.
The user, “bfdtv,” said his test showed Comcast is delivering certain MPEG-2 HD channels at bit rates as much as 28% lower than Verizon, resulting in lower-quality pictures.
[From Test Shows Comcast’s HD Squeeze In Virginia - 3/27/2008 3:12:00 PM - Multichannel News]
I can say from first hand experience that most HD channels in Comcast for Reston, VA don't look as good as one would expect. The problem is that sometimes the content is not exactly HD, instead it is up-converted, and many times this is done poorly. A&E is sometimes shown simply stretched to fit the screen.
There are always a couple of channels that look really nice most of the time. One of the local PBS affiliates always looks fantastic, and the network channels look fine as long as they are running proper content, like for example Heroes, House, Bones, etc.
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