This was originally posted to mjpeg-developer, but
I figured most users would be interested in this.
>What are normal values for not-moved, moved, and
>new?
It depends entirely on your video. There are no
normal values. In general, one should watch the
numbers coming from y4mdenoise, and then look at
the original video, and based on that, tweak the
-z/-Z/-t/-T threshold parameters to match what you
would expect it to find on that particular video.
>(I get 4 lines for a given frame, presumably the
>two interlaced fields times the two domains (Y
>and CrCb))
Indeed, that is what you're seeing.
y4mdenoise's verbose output looks like this:
Frame A: BB.B% not-moved, CC.C%+DD.D% moved,
EE.E%+FF.F% new
A is the frame number, repeated for each field and
for each component of the video (i.e. Y and
CbCr). B is the percentage of pixels found in the
zero-motion pass (i.e. the -z/-Z options). C is
the percentage of pixels found in the
motion-searching pass for which the found region
had a zero motion vector. D is the percentage of
pixels found in the motion-searching pass for
which the found region had a non-zero motion
vector. (The relation between B and C should give
you additional info for how well you chose values
for -z/-Z/-t/-T.) E is the percentage of pixels
found to be new information during the
motion-searching pass, using a heuristic that
tends to speed up results for scene-changes and
other times when there is very little repeated
information between two frames. F is the
percentage of pixels found to be new information
at the end of the frame, when all analysis is
completed.
As soon as I can figure out how to explain all
that simply, I'll put it into the manpage :-)
Steven Boswell
ulatekh at yahoo dot com
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