On Sun, Mar 20, 2005 at 02:23:32PM -0500, Cory Papenfuss wrote: > On Sun, 20 Mar 2005, Sergey Alexandrov wrote: > > What I did: record 5-minutes mpg with fast scene changing, > > went through it frame-by frame and saw that every three frames > > form 5-frame sequence non-interlaced, i.e. frame sequence looks like: > > 2 interlaced frames - 3 non-interlaced, 2 interlaced ... and so on. > > It can be seen clearly on tv. I've checked it with Myth xbox frontend, > > gmplayer, xine and totem, so looks like the problem is in mpg file. > > I have about 15 movies on disk and I found all of them have the same > > 5-frame sequence. Because of that, video looks a little bit jittery. > > > > Could anybody confirm that? > > > Was it a telecine'd source?
Indeed, Sergey, it sounds like the program you were recording originated on film, at 24 frames per second. Since NTSC is a 60 field per second format, the common solution is to use a procedure known as 3:2 pull down, the result of which is what you see: 3 frames where the two fields came from the same frame of film, and 2 frames where the two fields came from different frames. Though, on looking around a little, I think you have the counts backwards. Look at the second and third pictures on this page: http://www.digiconform.com/24vs30.html and you'll see that it *should* be 2 stable frames, and 3 mixed ones, repeating. If you really are seeing *3* stable frames in a row, then someone, somewhere, has probably done something wrong, and that's why it looks weird. Cheers, -- jra -- Jay R. Ashworth [EMAIL PROTECTED] Designer Baylink RFC 2100 Ashworth & Associates The Things I Think '87 e24 St Petersburg FL USA http://baylink.pitas.com +1 727 647 1274 If you can read this... thank a system adminstrator. Or two. --me ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ ivtv-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ivtv-devel
