[FFmpeg-devel] [PATCH] swscale: set sane alpha blending defaults

Carl Eugen Hoyos cehoyos at ag.or.at
Sun Aug 30 20:09:05 CEST 2015

wm4 <nfxjfg <at> googlemail.com> writes:

> Change the default to blend with black, which 
> gives generally expected results.

Given that this introduces a speed regression, is 
rarely needed and it is immediately visible that 
the function is needed, I don't think this is a 
sensible change.

Note that contrary to visual issue, the performance 
regression is not immediately visible.

And "black" may be sensible for prores, in all 
other cases, it is either suboptimal or bad.

Carl Eugen

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