This article is from the DVD Formats FAQ, by jtfrog@usa.net (Jim Taylor) with numerous contributions by others.
Many DVD's are labeled as having widescreen (16:9) format video on one side
and standard (4:3) on the other. If you think both sides are the same,
you're probably seeing uncompressed 16:9 on the widescreen side. It seems
to be 4:3 pan & scan, but if you look carefully you'll discover that the
picture is horizontally compressed. The problem is that your player has
been set for a widescreen TV. See 1.22 for details.
 
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