Compressing to BD9 or BD5 doesn't retain the true 1080p resolution either. Another words might as well buy the standard DVD if you are going to do that... Upscale to 1080p yes retain the true resolution no. There is a big difference.
Charlie, I am absolutely shocked and appalled at your statements. I have been building a library of BD9 discs for the past few months, and for you to claim the picture quality resembles no more than an upconverted 480p DVD is utterly ridiculous.
One of the main reasons that I collect BD9s is to replace my current library of DVDs. I can tell you with no hesitation that the BD9 versions are far and beyond better than the DVDs... they have a much sharper and cleaner picture, as well as vivid and more realistic colours,
just like the original BDs. Don't believe me? I've seen
The Dark Knight in both the original BD version and the compressed BD9 version, and they're both equally spectacular, particularly during the IMAX sequences. When I watch regular DVDs now, I'm turned off by the dull images, muted colours, added edge enhancement, and everything else that delivers an overall muddy picture compared to both BD and BD9. Oh yes, and I'm using a Sony 52" LCD hooked up via HDMI to a BDP-S350.
There is absolutely no 'big difference' to be found between BD and BD9 discs. There can potentially be some small differences, usually found if a movie is quite long and/or the encoding was done poorly. In these cases, you will see macroblocking in certain scenes (usually dark scenes), but the overall picture resolution will remain the same. The x264 codec does not say to itself "oh, I don't have enough bitrate on this 7.95 GB disc to handle absolutely everything on this frame. I think I'd better bump my resolution down to 480p." Yeah, right.
As a very general rule or guideline, NO MORE than 10% to 15% compression and the human eye can not see a difference in video quality.
This may be a somewhat acceptable rule for the archaic MPEG-2, but h.264 obviously has a much larger margin of tolerance.
Visor