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Originally Posted by Brother John
Ok, 704 is valid as well. But I've never seen a disc actually using it.
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Try some TV series DVD. You'll find that most of them use only 704 pixels and pad the rest with black bars.
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So why assume something that apparently is wrong? For practical purposes a "stick to the ITU PAR table" is sufficient anyway. No need to know about the backgrounds at all.
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704 isn't wrong! In digital video 704 is the active number of horizontal pixels for both PAL and NTSC. The pixel aspect ratios I quoted to you are based on 704x480/576. I didn't make up those numbers - they are the actual pixel aspect ratios used by everyone from Adobe to Microsoft.
Also, note that VCD resolutions are 352x240 and 352x288. Exactly quarter res. That's no coincidence.