Engineer01 said:MPEG 4 but at what bandwidth, who knows. Which is obviously the point. And why not apply MPEG4 to the SD format now? I will tell you why... because the SD pictures will look better, and that would render the HD format useless until REAL money was spent.
Sky have a deal with Astra for three more transponders for the HD service. (28.2E). The number of channels on these transponders will affect what you see, transponders on astra currently have around 6-8 channels each. Channel four has its own. So the quality is far from decided upon, yet they have people scrabbling to sign up, it beats me!