Daniel Falk
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 Posted:
Tue Oct 12, 2004 3:49 pm Post subject:
tip: use ffdshow as realtime picture processing while encodi |
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Couldn't see any threads about this so I thought I'd just chip in a quick tip
about this great little jack of all trades, ffdshow.
Some of you might recognize ffdshow as that open source DirectShow-filter
that can decode (and encode) all sorts of codecs like xvid/divx/mjpeg/mpeg4v2
& v3 etc etc. With that installed one can play virtually all kinds of
..avi-files found on the net.
BUT, it doesn't end there. I hadn't tought about it until I had the need to
denoise and color correct a live feed. ffdshow can be added as an filter
inside WME and since it's developed for speed it probably won't give that
much of an performance hit as one might think.
My machines are P4@2.8 and use Osprey 230-boards to encode and archive live
feeds from videoconferencing studios at a Swedish university. The feed from
the system is quite bad honestly, lots of noise and washed out levels and way
too much red in the picture.
By applying the ffdshow-filter I can denoise using several different
algorithms, fix the levels via a realtime histogram, do rgb-gamma correction
AND crop & scale using much better algorithms than the WME rescale. I just
hit the start encoding button and then play with the settings, in realtime,
til I'm happy with them and the settings are automatically saved for the
filter.
If you haven't tried this, do. I was amazed by how much better my videos got
after some experimentation, especially the live feeds that couldn't be fixed
in post, but I also use it to do subtle denoising, great deinterlacing and
scaling on DV-captured material. No more save-to-Huffy (or frameserving) via
VirtualDub for me.
linkage:
http://sourceforge.net/project/showfiles.php?group_id=53761&package_id=59355
(download, install, then chose filters in WME and register the ffdshow raw
filter)
Good luck.
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