Video ad serving

Does anybody have any suggestions on how to handle video ad serving (i.e. adding things like pre-, mid- and postrolls ads into your videos)?

And, specifically, has anybody integrated the Kaltura Video Module for Drupal (http://corp.kaltura.com/) to handle this kind of thing?

Alternatley has anybody decided that using a third-party like Brightcove (http://www.brightcove.com) or Videoplaza (http://www.videoplaza.com) the best way to go for video ad serving?

Thx,

Geoff