Sorry, but you are wrong. MPEG-2 uses MASSIVE compression, just like H.264. Raw HD is about 1Gbps, your reference HD MPEG-2 is about 20Mbps, that's 50:1 compression.
H.264 done well can be as good or better than MPEG-2, and at smaller file sizes to boot.
I don't know why it results such a big difference in compression. Are we talking about capping program from TV or Blu-Ray? I'm asking this because I don't care too much about Blu-Ray. It's capping programs in HD that I want.
Even if we are talking about capping program in HD, I have never seen anybody who was able to cap anything with birate in 1GB. The best capping quality I saw was FEED which provides stunning 40 mbps. There I have seen done in both h264 and MPEG2 format. However, it's MPEG2 format that I prefer because its format is allowed to be played with any media software without exhuasting my CPU possessor.
Your box will not output an MPEG-2 stream period. It decodes the MPEG-2 and will output it as SD NTSC over RF, Composite or S/Video, or uncompressed HD over Component or HDMI.
If you want to record HD, Component is your only option and the HD PVR is your best bet for that.
Are you saying to me that there is no way for me cap anything from my Motolora Comcast HD box in MPEG2?
Well, I see at least one person who does it. Yes, that is right. This person is still able to cap programs from Comcast HD BOX in MPEG2.
However, I have no idea who he does it and I try to ask him how he does it, but he refuses to answer me.