QT 7 opens 720x480 MPEG-2 files @ 640x480 ?

Hello
When I open 720x480 MPEG-2 files in QT Pro 7 they are cropped to 640x480 which is also indicated as the "original size" in the info window.. This doesn't seem to affect the original file nor does it seem to matter which compressor I have used to compress them.
FWIW, VLC opens the same files @ 720x480.
Anyone know why this is happening ?
Thanks
Tim

They're not cropped, they're scaled. The reason is because NTSC and PAL video is 4:3 aspect ratio, but dots on a TV are not square. This means that the DV file for NTSC has to be 720x480, and for PAL it's 720x576. For playback on a computer screen that has square pixels the video is resized to get the 4:3 ratio back again.
The best resize for NTSC video is 640x480, because then the fields don't get intermingled. For PAL a size of 768x576 would be better, though I suspect that QuickTime would show it as 640x480 too. 720x540 may seem like another good NTSC choice, but for that the field lines have to be scaled up, and that may introduce strange field effects.

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QT 7 opens 720x480 MPEG-2 files @ 640x480 ?

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