Posted by Jeff Rife on 04/15/06 21:06

Jan B (nospam@nospam.se) wrote in alt.tv.tech.hdtv:
> I see the two possibilites for DVD encoding:
> 1) No repeated frames are stored:
> Frame 1 field 1
> Frame 1 field 2
> Frame 2 field 1
> Frame 2 field 2
> Frame 3 field 1
> Frame 3 field 2

This, along with the "repeat field" flag is used on the majority of movie
DVDs.

> 2) The sequence to output is already encoded on the DVD:
> Frame 1 field 1
> Frame 1 field 2
> Frame 1 field 1
> Frame 2 field 2
> Frame 2 field 1
> Frame 3 field 2
> Frame 3 field 1
> Frame 3 field 2

Depending on the telecine and the edits in the movie, there might be a few
times where this is used, even though the majority of a particular MPEG
stream on a DVD uses the first encoding.

In all cases, though, there *must* be enough fields output to keep the
rate at 60 fields per second. Encoding 48 fields (i.e., 24 frames) per
second on DVD is illegal.

--
Jeff Rife | "Isn't that just great? I can't find a real
| relationship...I'm incapable of meaningless
| sex...what does that leave me? Oh, my
| God...I'm gonna have to learn computers."
| -- Jon Cryer, "Partners"

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