Re: 2:2 pulldown.

James Courtier-Dutton wrote:

> On DVDs the "Progressive frame flag" is next to useless, for historic 
> reasons.

Why do you say that?  Progressive DVD players still take advantage of that flag...

> So, does anyone know of an automated way to discover if a PAL DVD 
> contains film content (frames) or TV content (interlaced fields)

To tackle this, I would assume that all content is interlaced, so you would 
seperate the fields out and double the rate (ie, 25i content would become 50p). 
  Then I would watch  for repeating frames (using a threshold for noise of 
course).  If the program "sees" the picture changing all the time (like 
change-change-change-change) then it's interlaced; if it sees changes every 
other frame only (like change-same-change-same) then the source was progressive.

The folks at doom9.org can probably point you to something.
-- 
Jim Leonard ([email protected])                    http://www.oldskool.org/
Want to help an ambitious games project?             http://www.mobygames.com/
Or check out some trippy MindCandy at             http://www.mindcandydvd.com/


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