Mpeg 4 and Mpeg 2 are encription methods. They are how the signals are compressed. Yes a long time ago dish was doing mpg2 for all services. It wasnt untill early last year, that they started to do mpeg 4 for hd programming, and all future programming will be in mpg4. Mpeg 4 allows dish to get more out of the space they have available.

As far as dish matching directv. Its a debate. Dish does have plenty of space available, but they have done nothing. I'm not counting tbs hd, because everyone knows what is going on with TBS HD here and How that got added.

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