WebsiteOptimization.com has some interesting information about how web pages have grown in size and complexity over the last few years. You can read the whole story here and below is a piece of the story about multimedia that interests us in particular. Of particular interest is how many videos are abandon and how broadband is still catching up to allow for a seamless viewing experience.

The Growth of Multimedia on the Web

The use of streaming media on the Web has increased by more than 100% each year (Li et al. 2005). From 2000 to 2005 the total volume of streaming media files stored on the Web grew by more than 600%. More than 87% of all streaming media is abandoned by users in the first 10 seconds, however, wasting up to 20% of server bandwidth (Guo et al. 2005). [I wonder if that's still true.] While only 3% of server responses are for videos, they account for over 98.6% of the bytes transferred (Gill et al. 2007). In true Pareto fashion, about 10% of the most popular videos on YouTube account for nearly 80% of the views, making caching an appealing performance enhancement (Cha et al. 2007).

Overall, for videos longer than 30 seconds, about 13% of home and 40% of business users experience quality degradation with their streaming media, caused by re-buffering, stream switching, and video cancellation. For sessions longer than 300 seconds, the results are even worse. As broadband penetration has increased, videos have grown in size, bit rate, and duration (see Figure 5).

In 1997, 90% of videos were under 45 seconds in length (Acharya & Smith 1998). In 2005, the median video was about 120 seconds long (Li et al. 2005). By 2007, the median video was 192.6 seconds in duration (Gill et al. 2007). The median bit rate of web videos grew from 200Kbps in 2005 to 328Kbps on YouTube in 2007. So by late 2007, the median video weighed in at over 63MB in file size. On YouTube, the average video size is 10MB, with over 65,000 new videos added every day.