Can I set videos to be played 20 seconds ahead?

I set thumbnails to generate at 00:20 and I would like the video starting point to match the thumbnail. Can I set video starting point to 00:20?

http://www.boonex.com/forums/topic/Video-Thumbnail-generation.htm

Yes that is how I set the thumbs to 00:20. That part is already done. Now I need to set the video to play at 00:20 to match the thumb.