This can now handle filters which are added to graphs out of order,
including auto-inserted scale filters.  As an added bonus, it can
now detect circular filter chains which wouldn't work anyway.

Commited in SoC by Bobby Bingham on 2007-12-24 03:22:10


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@12073 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b