<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=UTF-8"> <META NAME="GENERATOR" CONTENT="GtkHTML/4.6.6"> </HEAD> <BODY> Le mercredi 27 novembre 2013 à 09:43 +0100, Sebastian Dröge a écrit : <BLOCKQUOTE TYPE=CITE> Should get a bug report I guess. </BLOCKQUOTE> 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 </BODY> </HTML>