On Fri, 7 Jul 2006, [UTF-8] Bernhard Fr??hmesser wrote:
> > They are median filters. The -m is applied BEFORE the -t. The -M
> > is applied after the -t.
>
> So they can be useful for what type of video?
"impulse noise" - small dots or specks in the picture. I've used
a small radius medianfilter on very noisy video. I know that with
'yuvmedianfilter' you can specify the radius with -r and -R (for luma
and chroma respectively). "-r 2" is the default and is slower (and will
tend to soften the image more - but for noisy video this might be what
is desired!), "-r 1" is a lot faster and leaves more detail.
Combining the medianfitler with the unsharp filter can greatly
improve the visual appearance of the video. It's the same technique
used with still images: blur and then sharpen.
I do not think that yuvdenoise allows the specification of the radius
used with -m or -M.
> I played around a bit with the video using the filters and then yuvplay
> at the end and not mpeg2enc and i realized that these "painted effects" ...
> create the video file i have these "painted effects", on my old box i
> have version 1.8.0 of mjpegtools installed and i did exactly the same
> Exactly the same cmd on the old box didn??t produce these "painted
> effects" in the video.
So on your new box you are using a newer (cvs?) version? And on the
old/other system you're using 1.8?
> Some bug in mpeg2enc maybe?
Possible. There have been some major changes made - possible that
bugs have been introduced. I haven't done much encoding with the
current CVS version of mpeg2enc - I'm waiting for Andrew to give the
"it's working better" signal ;)
Cheers,
Steven Schultz
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