TrueView ads are a family of formats that give viewers choice and control over which advertisers' messages they want to see and when.
What are TrueView in-stream ads?
TrueView in-stream ads may be seen as a pre- or mid-roll video ad against short or long form partner content viewed on watch pages. Viewers have the option watch the ad in full or to skip the ad after viewing it for 5 seconds.
Advertisers are only charged when the viewer watches 30 seconds of the ad or watches to the ad's completion, whichever is shorter. There is no maximum length for TrueView in-stream ads.