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

[Paul B Mahol]

On 5/21/13, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> 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.

Impact would be irrelevant with geq.

>
> Carl Eugen
>
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