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Old 29th October 2010, 22:52   #38  |  Link
frustum
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Join Date: Sep 2010
Location: Austin, TX
Posts: 40
The wiki

http://avisynth.org/mediawiki/External_filters

says that autolevels works on YV12, YUY2, RGB32, RGB24 format pixels.

Certainly it works on YV12. If I convertToRGB24() before autolevels, it still works, but the effect is small. If I convertToRGB32() first I don't see any difference from the unprocessed video.

But my biggest problem is that ConvertToYUY2().autolevels() produces a very saturated purple video (it might be different on different clips, but this is what I'm seeing).

Is the wiki simply wrong?

I've worked around it with this:

(orig is in YUY2 format)
tmp = orig.convertToYV12().autolevels().convertToYUY2()
orig = MergeLuma(orig,tmp)

but if there is a more direct way to operate on YUY2() without the two conversions, I'd like to know.

Last edited by frustum; 30th October 2010 at 00:03. Reason: (fixed a typo)
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