libavutil/error.h.
    
Error code definitions and handling code belong to libavutil, where
they can be shared by all the libav* libraries.
    
See the thread:
Subject: [FFmpeg-devel] [PATCH] Move error codes definitions from lavc to lavu
Date: Sun, 19 Jul 2009 12:09:16 +0200


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@22501 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b