[FFmpeg-devel] [RFC] Exporting the alpha mode from decoders

Carl Eugen Hoyos cehoyos at ag.or.at
Fri Feb 6 13:10:59 CET 2015

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

> > I will fix this later if nobody beats me.
> How do you intend to beat this?

Setting it to 0RGB32 instead of RGB32.
Unrelated to your API suggestion, this is a 
bug in FFmpeg that we should fix.

> Explicitly writing the alpha component?
> (I was assuming this was a no-go.)

We do this in many cases but it is not 
necessary in this case.

Concerning your API suggestion, the pix_fmt 
should always tell you if there is a useful 
transparency layer or not. If this is not 
done correctly in some cases, I would like 
to fix them.

Carl Eugen

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