[MPlayer-users] DVD aspect ratios
113762 at vs.iki.fi
Mon Mar 7 14:14:42 CET 2005
On Mon, Mar 07, 2005 at 07:33:07AM +0100, Dominik 'Rathann' Mierzejewski wrote:
> > This of course applies to 4:3 image too. The numbers are 108/79 for
> > NTSC and 160/117 for PAL.
> Are there any official docs supporting your claim available on-line?
I'm not aware of any official docs online, but anyone interested in
digital video aspect ratios should read this:
Long time before I knew anything about this, I measured the the projection
properties of the optics of my PAL DV camcorder as accurately as I could so
that I could reproject the images on spherical surface for accurate stitching.
The aspect ratio I got from those measurements was 1.366848. Considerably
wider than 4/3, which puzzled me a lot.
The paradox disappeared when I learnt how the video aspect ratios really
should be calculated: 1.36685 matches 160/117 very nicely. The error
is approximately one third of a pixel, which is well within the inaccuracy
of my measurements.
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