Using videomixer and alpha channel

[Eric Trousset]

Merci !!!

Setting the output format of the mixer to ARGB format fixed my issue with the alpha blending !

Should I file this as a bug? Or maybe a line should be added to the documentation?

Cheers,
Eric

From: Nicolas Dufresne [mailto:nicolas.dufresne at collabora.com]
Sent: mercredi 27 novembre 2013 15:10
To: Discussion of the development of and with GStreamer
Subject: Re: Using videomixer and alpha channel

Le mercredi 27 novembre 2013 à 09:43 +0100, Sebastian Dröge a écrit :

Should get a bug report I guess.

Note that in current state, videomixer will color convert to the output format before blending. You need to make sure you vieomixer output format has alpha channel, otherwise you'll loose that information. Whether that is a bug, maybe, fixing it would mean that videomixer would do colortransform again at the output, it's probably better to simply add a converter after, but maybe fail the pipeline ?

Nicolas

p.s. I mean: source* -> videomixer ! videoconvert ! videosink
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