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

[Carl Eugen Hoyos]

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 
data.

Carl Eugen