Custom key-value pair targeting of videos

You can set up custom key-value pairs for any video added into Brid via the "Custom Parameters" interface on the video edit screen.

Key-values let you define custom targeting. They are included in ad tags and used in line item targeting. When an ad request comes in from one of your pages that has key-values in its ad tags, line items that target those key-values are eligible to serve for that ad request.  

Key-values can be used for a variety of purposes. They can be used to identify pages, specific parts of a page, or other ad inventory. They can also be based on information you've gathered about people who visit your website or app in order to target ads based in that information.

Just enter a valid key-value pair name and value and make sure that your ad tags have custom params macros properly setup in the following way:
cust_params=slot%3D[item-KEY]%26prod%3D[item-KEY]%26mak%3D[item-KEY]

So for example if you have custom params on video like on the following screenshot:

and the following custom params macros setup in your ad tag:

https://pubads.g.doubleclick.net/gampad/ads?sz=640x480&iu=/124319096/external/single_ad_samples&ciu_szs=300x250&impl=s&gdfp_req=1&env=vp&output=vast&unviewed_position_start=1&cust_params=deployment%3Ddevsite%26sample_ct%3Dlinear%26slot%3D[item-slot]%26prod%3D[item-prod]&correlator=

and this is how your ad tag will look like once those custom params macros are replaced:
https://pubads.g.doubleclick.net/gampad/ads?sz=640x480&iu=/124319096/external/single_ad_samples&ciu_szs=300x250&impl=s&gdfp_req=1&env=vp&output=vast&unviewed_position_start=1&cust_params=deployment%3Ddevsite%26sample_ct%3Dlinear%26slot%3Dpre-roll%26prod%3Dopel&correlator=

Use this feature to easily target single videos to specific campaigns you have set up in GAM.