An Experiment To Characterize Videos On The Web. Soam Acharya Brian Smith Cornell University MMCN 1998. www. www. www. www. Overview. Designed and implemented an experiment to search and analyze videos on the web 22500 HTML documents 57000 movies 100 Gbytes of data. Why?.
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Not all that many. We found 57,000.
90% last 45 seconds or less. 1.1 Mbytes is their median size
QuickTimeis about 53%, followed by MPEG (30%) and AVI
MPEG compresses best. QuickTime and AVI are similar.
28.8 - 128 Kilobits/sec (Kbps) are useless for real-time download and display of movies.
(width * height * # of frames)
Mean Median (bits/pixel)
AVI 2.51 2.14
QT 2.16 1.82
MPEG 0.72 0.51
Frame Type Mean bits/pixel Median bits/pixel
I 1.25 1.10
P 0.76 0.54
B 0.31 0.19
Frame Pattern % Distribution Mean
I 27.1 1.17
IBBPBB 15.7 0.7
IBBPBBPBBPBBPBB 10.4 0.31
IBBPBBPBBPBB 8.1 0.5
IBBBPBBBPBBB 4.4 0.66
IPBBIBB 4.2 0.39
IIP 3.5 0.7
80% of MPEG: some recurring pattern