This is a more general question:
If video (such as wu's) is interlaced, doesn't that require de-
interlacing with an external tool?
I got the impression that wu's video is actually progressive, but the
codec is compressing it as interlaced, which seems to be the default
behavior of the Motion JPEG B codec.
If your video is truly interlaced, and you want to deinterlace it,
then you do typically need to use a deinterlacing tool. QuickTime has
a deinterlace option, but not many codecs support it. The only one I
know of for sure is the DV codec, and I think it does a fairly quick
and dirty deinterlace (eg: throws away one field and interpolates the
other one).
Similarly, if it's progressive scan, to get interlaced, doesn't that
also require an external tool?
It depends. True interlaced video has interfield motion, so for
example to generate true interlaced 60 field/sec video from
progressive video you would ideally need 60 frame/sec progressive
source. Alternatively you would need to do some sort of motion
adaptive processing of lower frame rate progressive source. Either of
these requires special tools.
Typically what happens is people just generate and output progressive
video as interlaced (eg: output 30 frames/sec as 60 fields/sec),
which is often referred to as segmented frame (the progressive frame
has been segmented in to two fields). This doesn't typically require
special tools.
Follow up questions:
Are there free downloadable tools to do this?
Glenn.
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