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VDOLive




VDOLive is currently not available. For now, try LiteVDO for Mac or Windows
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VDOLive is a architecture for web video delivery, created by VDOnet Corporation. VDOLive is a server-based, "true streaming" architecture that actually adjusts to viewers' connections as they watch movies. Thus, true streaming movies play in real-time with no delays for downloading. For example, if you clicked on a 30 second movie, it would start playing and 30 seconds later, it would be over, regardless of your connection, with no substantial delays.

VDOLive's true streaming approach differs from QuickTime's "progressive download" approach. Progressive download allows you to watch (or hear) as much of the movie as has downloaded at any time, but movies may periodically pause if the movie has a higher data rate than the user's connection, or if there are problems with the connection or server, such as very high traffic.

In contrast to progressive download, the VDOLive server talks to the VDOPlayer (the client) with each frame to determine how much bandwidth a connection can support. The server then only sends that much information, so movies always play in real time. In order to support this real-time adjustment of the data-stream, you must use special server software to place VDOLive files on your site.

The real-time adjustment to the viewer's connection works like this: VDOLive files are encoded in a "pyramidal" fashion. The top level of the pyramid contains the smallest amount of the most critical image data. If your user has a slow connection, they are only sent this top portion. The file's next level has more data, and will be sent if the viewer's connection can handle it, and so forth. Users with very fast connections (T1 or better) are sent the whole file. Thus, users are only sent what they can receive in real-time, but the data has been pre-sorted so that the information they get is the best image for their bandwidth.

Because VDOLive uses a different type of Internet protocol than the standard one used by web sites, it may not work for some users behind firewalls and other web obstacles.

A downside to VDOLive is that viewers must have a PowerMac or Pentium computer to view it. Also, since VDOLive automatically adjusts the video to the bandwidth of the user's connection, you do not have control over how the final image will appear to viewers. Over slow connections, the image may be blurry and play at low frame rates. However, users don't have to wait to see the video. We recommend you experiment with the demo version of VDOLive included on the Media Cleaner Pro 2.0 CD-ROM to see if it meets your needs.


VDO Video Codecs
Codec
(Primary Use)
Pros Cons Availability
VDOLive
WWW video
True streaming: adapts to user's connection, giving best results for range of connections Requires special server; may be blocked by firewalls Available from VDO.net
Lite VDO
WWW video
Doesn't require special server; no firewall issues Fixed low datarate; doesn't take advantage of good connections Available from VDO.net

VDO Audio Codec
Codec
(Primary Use)
Pros Cons Availability
VDOWave Audio
WWW audio
20:1 compression keeps audio bandwith low Only one frequency (8kHz) Available from VDO.net



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