Stock - Lecture Audience Timelapse
If it sounds usefull I would recommend downloading a low-quality 64x MPEG-4 to make sure it is what you want. If so, then download the original 4x, 16x or 64x MPEG-2 as that will be the highest quality.
Open Source Video. Videos and stock footage Gordon McDowell created (or helped create). All videos and stock footage hosted at Internet Archive, and have Creative Commons license.