ShowFiveVersions (clip1, clip2, clip3, clip4, clip5)
ShowFiveVersions takes five video streams and combines them in a staggered arrangement from left to right. The only use for this (that I can think of) is to help find the NTSC pulldown pattern. You can do this using code like this:
# View all five pulldown patterns at once
DoubleWeave()
# put a resizing filter here if necessary (see below)
a = Pulldown(0,2).Subtitle("0,2")
b = Pulldown(1,3).Subtitle("1,3")
c = Pulldown(2,4).Subtitle("2,4")
d = Pulldown(0,3).Subtitle("0,3")
e = Pulldown(1,4).Subtitle("1,4")
ShowFiveVersions(a,b,c,d,e)
This code displays the five pulldown patterns with some text identifying which is which. I then look through the movie and pick the pattern which avoids blending frames. (In ordinary pulldown, there will actually be two which work equally well. Look at the diagrams in the Pulldownfilter section to see why.) If none of the five works, then you're dealing with one of the more perverse forms of pulldown and you might want to use PeculiarBlend.
By the way, if you're planning to capture at a high resolution and then scale down, as I recommend elsewhere, you should probably place the ReduceBy2or BilinearResizeor whatever just after the DoubleWeavestatement in the code above. Before DoubleWeave it won't work correctly, and if you postpone it any further, ShowFiveVersionswill produce a really big frame.
Changelog:
| v2.56 | added YV12 |
$Date: 2005/01/26 22:08:36 $