With the incredible rapid growth that online video sharing and video search sites are realizing, more and more advertisers are pumping money into video advertising. According to the latest research, online video advertising revenues in the US are expected to reach $7.1 billion by 2012 which is a 72 percent compound annual growth rate for the next five years. In 2008, the projections are just shy of $1billion.

Due to the overwhelming demand from advertisers to develop effective methods for online video advertising delivery, some of the online video sharing giants have implemented various forms of online video ad formats. Historically, in-stream ads, also known as pre-roll ads, mid-roll, and post-roll, have been the dominant standard in terms of the format most advertisers gravitated towards due to the prominence of the ad content itself.

Pre-Roll Ads - In this format of advertising, the advertisement clip is inserted before the actual video and while playing the video, the advertisement clip is played first and the viewer is compelled to watch the advertisement before the start of the real video file.

Post-roll Video Ads: In post-roll ads, just like pre-roll, a 15 or 30 sec clip is streamed at the end of a video itself. This is usually launched in conjunction with pre-roll as well as often times, the advertiser never gets their ad seen as users most often only watch part of the video.

Mid-Roll Ads - This advertising format is where the clips are included in the middle of the videos so that the viewer goes through the video advertisement if he is curious enough to see the remaining part of the video, this format is also very popular with many of the video sites.

As stated earlier, due to the demand, many of these video websites have begun to test and offer new, innovative ad solution for video. One of these experimental format is the In-Player ad: With in-player ads the player skin itself can be used to place relevant images or text content for the advertiser so that the ad is displayed for the entire time that the video is played.

Contextual in-video advertising seems to be the way of the future with many different sites attempting to match videos with advertisements that are most relevant to the subject matter. Users like this format more as well as it does not disturb the experience of watching the entire video. This quality of the format makes it one of the most promising advertising formats for the future and there are many diverse ways in which to serve either images, clips, or text ads.

Of all the various experiments with contextual video advertising, one format has taken off and has even become the standard video advertising format that YouTube and many other sites have adopted instead of pre-roll ads. This format is known as the Overlay ad and it is basically a contextually relevant text ad that is shown in a portion of the player and does not annoy users as much as in-stream advertising.

Although there are a few other formats that are being tested and utilized, the formats that I covered are the most commonly used formats at the moment. That being said, with the attention on this sector as it is, we will likely continue to see rapid innovation and will keep our eye out for the next best online video ad format.

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This post was written by Mark Robertson, author of ReelSEO.com, a site focused on video marketing. For news, more info, tips, and guidelines on video advertising and monetization , visit ReelSEO.