<!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 15:23 +0100, Eric Trousset a écrit : <BLOCKQUOTE TYPE=CITE> Should I file this as a bug? Or maybe a line should be added to the documentation? </BLOCKQUOTE> For everyone interest, we decided to produce an error if we are going to loose an alpha channel. Adding a videoconvert after mixer being the solution to this error. Nicolas </BODY> </HTML>