> Rats...my memory of the conversation was that TOP_FORWARD was
> necessary to correct DV of telecined video.
And for a long time that was the prevailing method - but I ran into
problems back (3 or 4 years).
> (I searched the
> mailing list archives, by asking Google for "TOP_FORWARD
> site:mail-archive.com", but couldn't find why TOP_FORWARD was harmful.)
I took a quick look and saw bits/pieces of the threads but not parts
I was looking for. Try searching for yuvkineco and yuvcorrect
I've got to get out the door and don't have time to do much more than
clear out the mailbox.
> As an experiment, I tried running yuvkineco on video without
> doing TOP_FORWARD, and it was visibly worse.=A0 Maybe that's
> because yuvkineco is top-field-first only?=A0 It didn't seem to
> complain about being given bottom-field-first video.
Hmmm, I thought yuvkineco would complain about the wrong field order
> The reverse-telecined videos I make with yuvkineco TOP_FORWARD
> look great to me...and I thought I was nitpicky about these
> things.=A0 :-) Have I been living a lie?=A0 What should I be doing?
SHift the video one line up or down within the frame. This is MUCH
better (I think) than shifting the video 1/2 frame. Here's what I
wrote up about 3 years ago:
#!/bin/sh
N=rites
# NOTE: lie and say it's a progressive stream instead of bottom first. This
# hushes y4mscaler and we will tag the stream as top first anyhow after
# shifting down 1 line.
#
# Take the first 479 lines of a frame and place them in the last 479 lines
# of the output frame. This places 1 black line at the top and converts the
# stream from bottom to top field first:
# y4mscaler -v 0 -I active=704x479+8+0 -O sar=src -O size=704x480 -O align=BC
#
# OR
#
# If 720x486 input we can skip one top line and take the next 480 lines:
# y4mscaler -v 0 -I active=704x480+8+1 -O sar=src -O size=704x480
#
# -A ${N}.wav as needed.
qttoy4m -i p -a 10:11 /Volumes/TEMP/tmp/${N}.mov | \
y4mscaler -v 0 -I active=704x480+8+1 -O sar=src -O size=704x480 -O align=BC | \
yuvdenoise -t 4,6,6 | \
yuvcorrect -v 0 -T INTERLACED_TOP_FIRST | \
yuvkineco -F 1 -C yuvkineco-${N}.txt | \
y4mtoqt -a /Volumes/TEMP/tmp/${N}.wav -o /Volumes/RAID/TEMP/${N}.mov
and with that I'me off
Steven Schultz
>yuvkineco is top field first only.
>[...]
>yuvcorrect top_forward is harmful.
Rats...my memory of the conversation was that TOP_FORWARD was
necessary to correct DV of telecined video. (I searched the
mailing list archives, by asking Google for "TOP_FORWARD
site:mail-archive.com", but couldn't find why TOP_FORWARD was
harmful.)
As an experiment, I tried running yuvkineco on video without
doing TOP_FORWARD, and it was visibly worse. Maybe that's
because yuvkineco is top-field-first only? It didn't seem to
complain about being given bottom-field-first video.
The reverse-telecined videos I make with yuvkineco TOP_FORWARD
look great to me...and I thought I was nitpicky about these
things. :-) Have I been living a lie? What should I be doing?
Steven Boswell
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