[MPlayer-users] Re: PAL interlacing

Vladimir Mosgalin mosgalin at VM10124.spb.edu
Fri Jan 23 12:15:21 CET 2004

On Fri, 23 Jan 2004, Tobias Diedrich wrote:

TD>Vladimir Mosgalin wrote:
TD>> Can somebody please explain how PAL video is interlaced? I searched on
TD>> this a little, but it seems that almost everyone is writing about 50fps
TD>> video for the TV. I want to know, what is found on regular 25fps
TD>> DVDs with every frame (or every second frame) interlaced?
TD>Theres no difference. 50fps here refers to fields, while 25fps refers to
TD>frames (combined top+bottom field).

There is difference - if it looks like interlaced on monitor screen or
not ;)

TD>> Pattern in source film is (T1 B1) (T2 B2) (T3 B3) (T4 B4), speeded up to
TD>> 25fps; how exactly 25 fps interlaced video is produced from it? Is there
TD>> way to reverse it without deinterlacing?
TD>Film (23.976fps) is often converted to PAL dvd by speeding it up by ~5
TD>percent to get 25fps, so it should not be interlaced at all.

I know what is happening when there is 25fps non-interlaced video, I
want to know what's happening on 25fps interlaced DVDs...



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