The master feeds are not mostly MPEG 4. Only a few of the providers (like HBO) has gone all MPEG 4. Some of SHO is MPEG 2 some MPEG 4 none of Starz is MPEG 4 yet that I've found. It's hit or miss on all the rest of the cable providers.
Yeah, it doesn't matter anyways. But, heres a link. Pay close attention to the pink highlights(HD) of the western satellites. Tons of S2! The move has been on for a few years now.
AMERICA :: TrackSat.com
Lyngsat appears to be a little more up to date.
http://www.lyngsat.com/Galaxy-13-Horizons-1.html
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