Originally posted by: drag
Those onboard via's, even though they lack in performance usually, actually have pretty good hardware motion composation which is used as hardware acceleration for mpeg2 playback.
Except that it's not mpeg2 playback we're talking about. H.264 is not mpeg2, and since V1 and H.264 are the two primary HD codecs used on commercial discs, they're what's significant. Not mpeg 2.
For example a Althon 1600+ is perfectly capable of playback in Mythtv with 1080i resolution with propriatory nvidia drivers with a Geforce 5200 drivers and xvmc enabled.
Once again, how is this relevant? The fact that it's 1080i tells you NOTHING about the level of compression. Mpeg2, H.264, and V1 are all lossy codecs, and the bitrate is quite significant to that. Saying "it's capable of playing back 1080i" is equivalent to saying "my computer can play mp3s with sounds of wavelength 20hz to 20khz." OK, that's wonderful, but if the song is encoded at 96kbps, it's still going to sound terrible. The same goes for 1080i- what's the bitrate and encryption?
If you really need further evidence, go to, say,
this anandtech article on bluray. Notice anything on the X-Men III playback chart at the bottom (sans gpu acceleration)? That's right, the E6600 unaccelerated can't play it back on its own. The E6300 barely can, even with an 8800GTX doing the acceleration. If you're using an X1950XTX, then we're talking an E6600 as necessary. And all of this is being done in Windows XP.
Face it. The DRM is not the problem. The issue is simply that at the bitrates that HDDVD and BluRay are being encoded at, using the compression schemes that they're using, either a very top of the line CPU is required, or else a near-top of the line CPU and top of the line GPU is required. It's really that simple.