Description:The much blogged about introduction of a higher quality playback experience at YouTube, using a 1080p shoebox sized player, was done in part to accommodate the emergence of pre-roll video advertising on the giant site. In a related announcement this week, YouTube said it would start an experiment with pre-roll ads, providing users with the option to not see the ads. The quality and format of the YouTube player has been an issue for advertisers who want to present high quality.(3:51)