<!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 jeudi 16 janvier 2014 à 10:25 +0100, Dirk Van Haerenborgh a écrit : <BLOCKQUOTE TYPE=CITE> Hi all, </BLOCKQUOTE> <BLOCKQUOTE TYPE=CITE> </BLOCKQUOTE> <BLOCKQUOTE TYPE=CITE> I am trying to subtract a decoded stream from the original uncompressed stream to evaluate compression artifacts. For subtracting frames I am using the frei0r-mixer-subtract element, but I keep getting not-negotiated errors, though there seems to be no clear indication (in the logs) why that is happening. </BLOCKQUOTE> I tried and there is a negotiation problem indeed. Decoding the MKV result in more fields then decoding the AVI (pixel-aspect-ratio, colorimetry and interlace-mode), and this eventually fails the negotiation. But this does not explain anything, please file a bug to bugs.gnome.org, we'll continue the investigation from there. Thanks, Nicolas </BODY> </HTML>