HDFLVPlayer is compatible and capable of playing ads from VAST compliance AD networks. Here is an example of one of the VAST compliance ad network - Scan Scout. Here you can see both pre-roll and mid roll ads.
FEATURES
Never before seen features with superior high definition supported player suitable for playing any and all kind of videos.
Play YouTube videos directly.
Pre-roll ads, Post-roll ads.
Bookmarks option (diggit).
Native language support.