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For any advertising method to be effective, it has to have a target audience that is consuming the medium with which the advertising is attached to. That being said, advertisers are starting to realize that online video advertising is now an effective method to attract large relevant audiences.

Online video consumption has grown tremendously in the past few years and as a result, video sharing and video search companies are poised to reap the benefits of video advertising.

Since video sites have been realizing more and more traffic growth, they have had a unique opportunity to innovate and test various different online video ad formats. And the advertisers as well are more than happy to experiment as they are looking to these leaders to develop the most effective online video advertising formats. Traditionally, pre-roll, mid-roll, or post-roll ad formats (aka in-stream ads) have been favored by advertisers due to the availability of inventory and prominence of the advertisement 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 Format - In post-roll, just like the other in-stream ad formats, a short clip is played and streamed within the player at the end of the video stream itself. This is not as desired by advertisers as they know that many users never watch a video all the way until the end.

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.

Some of the video sites have started experimenting with different formats like, in-player banners: In-player ads sometimes include relevant text or image advertisements in the space available in video player between the outer margin of the video and the inner margin of the video player.

The buzz in the past year has been with regard to a newer method of video ad delivery that attempts to match relevance by choosing video ads to run with only video that is similar in subject. This is known as contextual video advertising and it can take on a range of different formats with images or text being displayed within a portion of the video window, only being activated when clicked on.

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.

I have given you a brief overview of the most common formats of video ads that are being tested and utilized at the moment. That being said, with growth being what it is, and video discovery as new as it is, we will certainly see many different companies innovating in regards to developing new and exciting formats for online video advertising.

About the Author:
This post was written by Mark Robertson, an expert in search engine marketing and video marketing. For news, information, and techniques for internet video advertising , visit ReelSEO.