[FFmpeg-user] Alpha not working as expected with geq filter

Carl Eugen Hoyos cehoyos at ag.or.at
Tue May 21 21:59:59 CEST 2013

Paul B Mahol <onemda <at> gmail.com> writes:

> >> Add format filter before geq filter, like this: 
> >>-vf format=rgba,geq.....
> >
> > I suspect geq does not support rgba (it should work 
> > without the format filter if it did), format=gbrap 
> > (if that is the name of planar rgb alpha) should work.
> Not needed.

You mean apart from the fact that an additional 
third scaler is inserted with "format=rgba" 
which will have a performance impact on real 

Carl Eugen

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