>Is it always a Good Thing to use yuvdenoise as
>some sort of numerical conditioner before feeding
>the stream to mpeg2enc, no matter the image
>cleanness? Are there any cases where using
>'yuvdenoise -f' is not advisable?
A new yuvdenoise has been checked into CVS, and I
haven't examined it to see how it works, but the
old yuvdenoise was mostly capable of numerical
conditioning. Even though it did its search in
terms of 8x8 blocks, that was enough to help
mpeg2enc's motion search, which is in terms of
16x16 blocks.
The problem with using the old yuvdenoise for
numerical conditioning was that it had a lot of
other denoising concepts thrown in there. You
would have to turn off the pass-2 bit-noise
reduction and the between-frame averaging ("-l 1
-p 0", I think) to do it right.
y4mdenoise, on the other hand, can definitely be
used for numerical conditioning. All the
complexity of y4mdenoise is basically in the
motion-searching part. Once it's identified parts
of the new frame that match parts of the previous
frame, it averages the two parts together, thus
giving them the same value. That's a relatively
light-handed treatment.
>Is there any way to denoise the chroma channel,
>and have the denoise strength depend on the luma
>channel?
I'm not sure what you mean here. Could you expand
upon it please? Maybe an example?
Steven Boswell
ulatekh at yahoo dot com
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