I am using Layer 7 / skypeout protocol (together with skypetoskype) in Mangle to identify Skype traffic to give it a higher priority in the queue tree. This works fine, except that skypout also picks up online videos (Youtube and others). I am therefore looking for a way to identify online videos to give them lower priority in the queue tree. Any ideas on how to do this would be appreciated.

The skypeout protocol overmatches terribly unfortunately, however if you're looking for an online video l7 Matcher there is one in here: http://l7-filter.clearfoundation.com/downloads/start

Grab the protocols pack and look for the video Matcher, I'd paste it but I'm on my phone right now