[MPlayer-users] PAL interlacing

Vladimir Mosgalin mosgalin at VM10124.spb.edu
Fri Jan 23 17:18:48 CET 2004

On Fri, 23 Jan 2004, D Richard Felker III wrote:

DRFI>On Fri, Jan 23, 2004 at 03:52:15AM +0300, Vladimir Mosgalin wrote:
DRFI>> Can somebody please explain how PAL video is interlaced? I searched on
DRFI>> this a little, but it seems that almost everyone is writing about 50fps
DRFI>> video for the TV. I want to know, what is found on regular 25fps
DRFI>> DVDs with every frame (or every second frame) interlaced?
DRFI>> Pattern in source film is (T1 B1) (T2 B2) (T3 B3) (T4 B4), speeded up to
DRFI>> 25fps; how exactly 25 fps interlaced video is produced from it? Is there
DRFI>> way to reverse it without deinterlacing?
DRFI>Interlaced video is NOT produced from film. It comes from TV/video
DRFI>cameras. There's no process to be "reversed"; this is just how it
DRFI>was originally recorded.

OK. Let's go to concrete examples. Yes, I've seen 25fps interlaced
videos that were most likely recorded with cameras - film bonuces are
often like that. But then I take "The Wall" PAL DVD and see that video
is interlaced, even in animation sequences. You don't suppose they were
recorded with camera, do you? I havn't seen NTSC version, only divx rip,
which is poor quality 29.97 non-interlaced video were fourth frame goes
twice - it was deinterlaced, so I don't know how it looked like on DVD.



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