摘要：In May 2003, the first author tested high-definition (hD)
video streaming playback with 1280 x 720 pixels clips encoded
at 2, 3, 5, and 7 megabits per second (Mbps) on a 2 Ghz
Pentium 4 computer. The result was video choppiness —a sign
this technology was not quite ready for prime time, at least with
mainstream computers (Dupagne, 2003). Since then, much has
changed in terms of computer processor speed, hD streaming
encoding solutions (see huang & Marsiglio, 2008), and penetra-
tion and bandwidth of high-speed Internet service (see Akamai
Technologies, 2008; comScore, 2008; horrigan, 2008; In-Stat,
2008). In light of this evolving technological environment, a new
look at hD video streaming playback is warranted. What are the
main hD video streaming sites available on the Internet? What
type of hD video streaming content do these sites offer? What
are the encoding parameters and playback requirements for hD
video streaming programs and clips? Answers to these questions
are important for electronic media educators because hD video
streaming is likely to revolutionize online video in this decade.
The U.S. transition from analog to digital television (DTV),
scheduled for completion by June 12, 2009, has already had a
profound effect on the development of hD video streaming.
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