In addition to the targeting methods available to display ads, the following options are available for in-stream video ads:
YouTube Content Rating Labels
Use YouTube Content Rating Labels to target ads to age-appropriate content placements. Do so by excluding the YouTube Content Labels you don’t want to target.
YouTube Channel Placements (RTB)
If you use a real-time bidder, YouTube Channels are passed to your bidder as a targetable signal.
In RTB callouts, we pass
afv_user_id_YYYY as YouTube targetable channels:
XXXXrepresents the channel name of a YouTube channel not linked to a Google+ account.
YYYYrepresents the unique user ID of a YouTube channel linked to a Google+ account.
In addition to in-stream video placements, Ad Exchange has available in-game placements from our network of AdSense for Games publishers. This inventory expands the reach and volume available to your campaigns, especially for longer duration video ads. If you want to target in-game placements, you need do nothing, as targeting works the same as for in-stream video placements. If you don't want to target in-game placements, select the "in-game" category exclusion.
Ad position (RTB)
If you use a real-time bidder, you can specify that your ads run in the pre-roll, mid-roll, or post-roll position.
Ad Player size (RTB)
If you use a real-time bidder, player dimension is a targetable signal, so you can specify the dimensions of the video player when targeting your in-stream ads.