On Fri, 3 Nov 2006, [UTF-8] Bernhard Fr??hmesser wrote:
> I am not sure, but i think the tape was used for recordings several
> times before.
Ah, ok - a worn tape could cause dropouts.
> > medianfiltering the chroma only, then using yuvdenoise with moderately
> > high thresholds (-t 6,10,10 and perhaps even add -m 4,8,8) will help
>
> Hmm, yeah, this settings help a bit more with noise - cool...
For really bad noise you might also add -M 4,8,8 (this is the post
median filter applied after the -t filter).
> I don??t know GIMP very good, same for Photoshop.
Can always learn :)
> Yep, the whole video has more than 150000 Frames and the lines are not
> always on the same place in the picture(s). So using the GIMP or
> Photoshop would take ages i think.
Ok, that answers my question. If the lines are not consistently in
the same location then the filters I suggested will not be useful.
Restoration of video is time consuming - that's why it can take a
studio a year or two to 'remaster' a movie using 2K (or 4K) scans
of the film.
> Yep, some month ago i read about a programm that does scratch line
> removal in a video it just copies nearby pixels in a radius which you
> can set before, i remember it was only for Windows (unfortunately) but i
> can??t remember the site :-(
Earlier there was a reply mentioning an avisynth filter - is that
the program you are thinking of?
> Hmm, i have never tested to load files in Final Cut Pro which i have
> recorded with lavrec, but since it??s MJPEG A it should work.
Yes, MJPEG will work. But if the scratches/dropouts are not in the
same place then cloning a fixed area from one place to another will
not work :(
> and i know ppl who have programming skills but no time for other
> projects :-(
That seems to be a constant problem - the folks who can do the work
are too busy with other projects (or 'real work')
> Thanks so far, i??ll play around with it and check the FCP filter.
I'm not sure how much use it will be in this case. I have that
plugin and it's fairly good at covering over a logo which stays in the
say place from frame to frame. I do not think it will be useful
with randomly moving lines :(
If there are some scratch removal filters, perhaps from the GIMP,
available maybe they could be ported to a mjpegtools utility. That
is how y4munsharp was created - that program is essentially the
GIMP unsharp-mask plugin converted to a y4m utility.
Cheers,
Steven Schultz
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