Vidiot (brown@xxxxxxxxxxxxxxxxxx): > Curiosity question. Is your reverse telecine detection going to be > able to handle playing of TV shows that are shot on film, but edited > on NTSC video, that do not keep the 2-3 pulldown pattern intact? Now > that more and more TV shows are FINALLY getting released on DVD, > several of these shows do not have intact pulldown through the > complete show. Pretty much every edit point breaks the pulldown > sequence. Dealing with phase changes is an annoying problem. I wrote an off-line algorithm that detects phase changes by going over the video multi-pass, it's in CVS here: http://www.sf.net/projects/reetpvr/ It seemed to work pretty well on a section of an episode of 'Power Rangers' which was edited at video speed but shot on film/2-3 pulldown converted. Argh. For realtime video, well, clearly it's difficult when you have a cut like that. Even worse is what happens when you have video content composited on top of pulldown material (like annoying animated channel logos, or video commentary on top of 2-3 pulldown content). I hope that we can find settings which are acceptable to handle most cases, but of course this will be difficult and is by no means deterministic. The case of DVD deinterlacing is much easier in comparison, since I can be pretty liberal in what I accept as pulldown there. I'm building on the experiences of the DScaler project under Windows which has a reasonably well respected 2-3 pulldown detection scheme, and also from my own attempts at DVD-specific pulldown detection, and some interesting results from the multipass/off-line algorithm. -- Billy Biggs vektor@xxxxxxxxxxxx
