I've been experimenting with yuvkineco for a few
weeks. The only tool that's done more than yuvkineco
to increase my video quality is y4mdenoise! Stripping
out 20% of the frames in a 3-2-pulled-down stream, and
allowing the remaining frames to take up 20% more
space, has been a big win! And those 20% that get cut
out are the nastiest frames; they do nothing but give
y4mdenoise and mpeg2enc big headaches. So the
increase in quality is much more than 20%.
I've learned that the "noise level" (i.e. yuvkineco's
-n option) really is important. The default of 10
seems to work on videotape, but I had to reduce it to
5 to get accurate results on a LaserDisc.
I've even started hand-editing the result. I found
one video that was mostly 3-2-pulldown, but had bits
of interlaced video mixed in! I was able to hand-edit
the file and get a decent result.
Some time ago, there was a discussion on 4:1:1 chroma
subsampling in DV files of 3-2-pulldown sources, and
how the color needed a special line-switch in order to
be completely accurate. (Lines 2 and 3 of every group
of 4 lines have to be switched, IIRC.) After thinking
about it for a while, I realized that the most natural
place for such a function is in yuvkineco, since the
problem only occurs with 3-2-pulldown sources. But
that means yuvkineco first needs to be modified to
deal with 4:1:1 chroma subsampling.
Is there any interest in such a modification? I know
I would certainly appreciate it. I've tried to
understand the source code to yuvkineco, but no one
seems to comment their code as thoroughly as I comment
my own. :-) This color-interlacing problem is the
last remaining artifact in my video, and I'm keen to
squash it.
Steven Boswell
ulatekh at yahoo dot com
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