iMovie '08 (Version 7.0) was released in August 2007 as a part of the iLife '08 suite. iMovie '08 was a complete redesign and rewrite of iMovie. It had much better HD output, and more formats to convert to. This was limited, however, by an undocumented restriction on supported codecs. iPhoto uses the QuickTime library and can create thumbnails for all QuickTime supported formats, but most of these cannot be used by iMovie '08. Some of the formats that iMovie '08 is able to import will not be recognized when they are added to an iPhoto library. Though Motion JPEG-encoded AVI files do appear to be recognized, this was the most common format used by digital cameras. A new feature called "skimming" for quickly previewing video in the library at a user controlled speed was added, and so was a feature that allows the user to highlight parts of video clips just like highlighting text. iMovie 08 also had the ability to add more than two layers of background sound, including multiple music, narration and sounds; previous versions could play multiple tracks but could display only two extra audio tracks. It included more exportation formats, including iPhone-sized video. It also supported non-tape-based HD video, such as AVCHD and footage from DVD and HDD camcorders. iMovie '08 also has the ability to export movies to the YouTube video sharing website.