How to use popunder ads on video

It depends on your implementation for your tube site. Most of us built these on wordpress platforms. If that's the case, you will need a customized theme if you are using one of the primary sales scripts, i.e. tubeace, wp-tube-plugin, etc....

There is not enough information supplied for you to get an accurate answer. Now a number of people will start to chime in soon with general advice which may or may apply to your exact situation. That's why it's best to supply absolutely all critical information for people to give you the best advice.

We don't even know how you built your tube site, so we can't really advise you how to display the ads. We don't know if you're using video embeds, or you are actually hosting all your videos yourself for your tube.

It's a needle in a haystack like this truly. About the only thing I can tell you is that default theme for wp-tube-plugin appears to have a working video ad overlay functioning. At least it did in the scripts I have used in the past. So that is one option for you, and/or you can also use that as guidance to try to figure out how they did it in their theme files. From my experience though ... it doesn't look that good, it doesn't have pseudo-streaming, etc... So it's sometimes about deciding what is more important - the aesthetics or the functionality of one ad in the player.

Actually I'm still on the fence about it, and would feel much better if someone could tell me how to implement it with TubeAce which is what I'm using, but I need it to work with video embeds from the major tube sites. I only prefer TubeAce over the others because it does do the pseudo-streaming even with embedded videos.