#2
by Juergen
BTW, 720x576 (PAL SD / Full D1) does not use square pixels, but computer (flat) screens natively do.
If the content was 4:3, the pixels had to be extended horizontally just a bit, to avoid producing egg heads....
With square pixels, 4:3 PAL SD would have 768 x 576, but the DVB standards don't allow this (nor does DVD).
Other PAL SD transmissions may also have 704 x 576 or 480 x 576, for example.
So PAL SD is always transmitted anamorphic.
FullHD instead may (but not must) use square pixels. But even this is rare, as more often this comes in 1440 x 1080.
So, to avoid mis-scaling is not really simple...
And basically your idea ain't bad, but then only the original number of lines might be used, but pixel width must depend on the transmission standard used and it's aspect ratio.
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