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Originally Posted by Sole_Survivor
What you're saying is true, I don't understand it, all I can say is that there is a massive difference in the picture quality on a DVD in 480 that was originally shot in HD converted down to 480, compared to it being in 480 from the get go... a big difference????
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That's not exactly what R.Sawdey was saying. I'll put it to you like this- standard DVD's are encoded with video files that hold 480 lines of resolution- that's the maximum amount for any standard, NTSC compliant DVD. Just about any movie, whether shot on film or in an HD format, has a much higher ceiling than this in terms of resolution.
All that an upscaling player does is present the DVD at 720p or 1080i, but it doesn't change the fact that the content on the disc contains 480 lines. Fixed-pixel displays, such as DLP and LCD sets, have only one native resolution that they can run at, which is usually 720p. Any other signal type that you pipe in has to be either upconverted or downconverted on the fly to 720p by a special chip in the TV. Some TV's do a relatively poor job of upscaling these signals when compared to the algorithms used by upscaling players. The end result can be noticeable, but it depends on your specific TV more than anything else.
HD-DVD's and BR discs, when they come out, will contain video files encoded with 1080 lines- which is a big step up from current DVD's.