[Bug 20648] man page update

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http://bugs.freedesktop.org/show_bug.cgi?id=20648





--- Comment #4 from Fabio <fabio.ped at libero.it>  2009-03-18 03:31:13 PST ---
Created an attachment (id=23994)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=23994)
Filter is only applied if *both* X and Y are scaled to more than double.

> > +the filter and 'auto' means apply the filter only if one of the X or Y
> > +sizes are scaled to more than double, this to avoid blurred output.
> small nitpick according to the code that's not quite correct. Filter is only
> applied if both X and Y are scaled to more than double.

Yes, you are right indeed. A small patch is attached.

> (As a side note, I'm
> not sure exactly why it has to result in blurring - is this a bug, using wrong
> coefficients or something like that, or unavoidable?)

I added this since I noticed this comment in radeon_textured_video.c:

 * Applying the bicubic filter with a scale of less than 200%
 * results in a blurred picture, so disable the filter.

Anyway I am against applying such filter by default since they loose details of
the video (I usually prefer to see the original encoded video without filters)
and can also overlaps with filters used by video players. However I am not sure
why it's enabled when scaled larger than 2x, but not otherwise.


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