*Every* hardware DVD player will scale it correctly if the owner of the player has set it up to match the type of TV they’re using. How many DVD player owners have it set up correctly? I don’t know – how many VCR owners still have the blinking “12:00” showing on the display? 🙂
You also have to deal with HDTV owners viewing properly-scaled 4:3 video content improperly distorted because they’ve set the display aspect ratio of their TV wrong. You have absolutely no control over the audience’s DVD player set-up and their TV PAR settings.
As I said: for standard def DVD there is only one frame size choice for NTSC and that is 720×480. Whether that footage has a PAR of 0.9 (standard 4:3) or 1.2 (widescreen 16:9) depends on your source footage and how you export it from your editing program. These days, with all new TVs on store shelves being 16:9 HDTVs, personally I’d edit my 4:3 SD footage in a 16:9 SD sequence so that it was permanently pillar-boxed and couldn’t be stretched by the audience choosing the wrong PAR on the TV. Reference the Star Trek Original Series BD episodes; that’s what Paramount did.
-Jeff
The Focal Easy Guide to Adobe Encore DVD 2.0