Flip4Mac is the name of the WMV component, available from telestream.
By default, in demo mode - it limits you to only 30s of video. If you're finding that Stomp isn't compressing the entire video then this might be why (have you bought it? :-) )
With the current version of the telestream WMV component, we've noticed an issue. Some longer videos will no longer compress in Stomp. We think that it's due to the way our StompServer is working, but have yet to confirm this. We have a change in the works, which will be a free update to all Stomp users, but at present it's not ready (it's a large amount of work).