TrueView in-stream ads run on videos served on YouTube or on a collection of sites and apps in the Google Display Network (GDN). These ads may also run on YouTube videos that are embedded on other sites or apps. They can also appear on Android and iOS YouTube apps, m.youtube.com (on iPad and Android), and on connected TVs.
Viewers can choose to skip the video ad after 5 seconds. If they choose not to skip the video ad, the YouTube video view count will be incremented when the viewer watches 30 seconds of the video ad (or the duration if it’s shorter than 30 seconds) or engages with your video, whichever comes first. Video interactions include clicks to visit your website, call-to-action overlays (CTAs), cards, and companion banners. If view counts on YouTube are a concern, it’s a good idea to make videos at least 12 seconds long. YouTube analytics doesn’t track views less than 10 seconds.
You can preview examples by clicking here