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Old 10th December 2012, 01:52   #16120  |  Link
Sneals2000
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Join Date: May 2007
Location: UK
Posts: 16
Quote:
Originally Posted by leeperry View Post
I have to admit that I never quite understood the whole 720x576 being 4:3 AR with non-square pixels story...but hey, they make 1024x768 Plasma TV's with a 16/9 AR, so I assumed that non-square pixels were an acceptable practice in the video world.

So how do you know the actual AR of a 720x576 FS stream then? Are you saying that 720x576 FS is not/never meant to be watched with a 4:3 AR? It sure looked OK to me
I'd say that you should always assume 720x576 video is ITU 601 compliant. It's the only proper standard for 720x576 video that I know of...

That means the 4:3 or 16:9 video is within the 702x576 central area. There is no other offical standard.

Of course some mastering may not follow ITU 601 and not follow any official standard and instead map the 720x576 image to be 4:3 or 16:9. That is non-standard.

I guess there's no real way of knowing...

Given the relatively small aspect ratio differences involved - I doubt many people are that worried... On the other hand - given the huge noise some make about <16 and >235 levels being preserved I'm surprised...
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