Compaq ProLiant 1600 Video Streaming Technology - Page 13

Video Data File

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ECG068/0798 WHITE PAPER (cont.) 1...3 network. The disadvantage is that the user may have to wait for a long time for the download to occur, plus have a large amount of disk storage space available to store the video file. There are also copyright concerns since a copy of the video is made to the user's hard drive. To address these issues, a new technology has recently been developed for delivering scaled and/or compressed digital video across a network called "video-streaming." Video streaming takes advantage of advances in video scaling and compression techniques as well as the use of network protocols that have been developed for real-time media streaming. These new protocols enable video with synchronized audio to begin playing at the client desktop before the entire file is received. This has the advantage of playing the video sooner and not requiring a large amount of disk space on the client. In addition, copyright concerns are reduced, since a complete copy does not have to reside on the user's hard drive. Another advantage is that video content may be integrated and streamed along with other media and the video can play inside standard Web browsers. The following diagrams contrast the "download and play" model with the new "streaming" model. Video Data File Play after Fil Download Fil download e Model e Delivering video by the download & play method involves transmitting the complete file-e.g., in AVI format-to the client. These files can be very large and the user must wait until the complete file is downloaded before playing. Buffer File Video Server Video Data Packets Packet Packet Packet Streaming Model Buffer Client Play as received By contrast, with video streaming, a second or two of packetized video is buffered at the client, and then the video begins to immediately play out of the buffer as the file streams in. The user does not have to wait for the whole file to download before viewing it. Isochronous Video In order to play smoothly, video data needs to be available continuously and in the proper sequence without interruption. This is difficult to do over packet-switched networks such as the

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W
HITE
P
APER
(cont.)
13
ECG068/0798
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network.
The disadvantage is that the user may have to wait for a long time for the download to
occur, plus have a large amount of disk storage space available to store the video file.
There are
also copyright concerns since a copy of the video is made to the user’s hard drive.
To address these issues, a new technology has recently been developed for delivering scaled
and/or compressed digital video across a network called "video-streaming."
Video streaming
takes advantage of advances in video scaling and compression techniques as well as the use of
network protocols that have been developed for real-time media streaming.
These new protocols
enable video with synchronized audio to begin playing at the client desktop before the entire file
is received.
This has the advantage of playing the video sooner and not requiring a large amount
of disk space on the client.
In addition, copyright concerns are reduced, since a complete copy
does not have to reside on the user’s hard drive.
Another advantage is that video content may be
integrated and streamed along with other media and the video can play inside standard Web
browsers.
The following diagrams contrast the "download and play" model with the new "streaming"
model.
Delivering video by the download & play method involves transmitting the complete file—e.g., in
AVI format—to the client.
These files can be very large and the user must wait until the
complete file is downloaded before playing.
By contrast, with video streaming, a second or two of packetized video is buffered at the client,
and then the video begins to immediately play out of the buffer as the file streams in.
The user
does not have to wait for the whole file to download before viewing it.
Isochronous Video
In order to play smoothly, video data needs to be available continuously and in the proper
sequence without interruption.
This is difficult to do over packet-switched networks such as the
Video Data File
Download
Model
Play
after
download
Fil
e
Fil
e
Packet
Streaming
Model
Play
as
received
Packet
Packet
Video Data Packets
File
Buffer
Buffer
Video
Server
Client