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By Al Giovetti
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Videostreaming

Multicasting is a form of videostreaming which is provided for by the internet protocol (IP) multicasting. The multicasting is the transport layer. You can use the video stream but you do not have to use multicast. Each videostreaming connection may required 20 Kbps. This would make 100 people drawing a videostream use 20,000 Kbps of band width. IP multicasting allows all of those streams to use the same 20 Kbps stream. The multicast stream is a live source. The video cast stream can be made available 24 hours a day and seven days a week. Can the multicasting be made available then?

If a data stream takes 30 minutes to download, it could start playing at any time. The variables control the wait time include the bandwidth or delivery rate of the clips. Ninety percent of clips are sent at 28.8 Kbps or slower. The next largest group, 56 Kbps, increases daily .

What determines how fast a one megabyte download will take to both download and start playing is determined by the bandwidth encoding. The Real Produer or any encoder is set to be usable by different types of modems. The most common setting is the 20 Kbps encoded level since most people receiving signal are using band widths below 56Kbps. YOu can use the real server technology to deliver different band width encoding set for different speed modems. This is referred to as real server scalability.

What web servers can use the real server technology? Almost every web server is preconfigured to deliver the real media signal. The producer of the content is not required to pay for this technology unless they own their own servers.

The difference between the real networks video stream and the AVI stream is that the real stream is highly compressed and the AVI is uncompressed. Most people use a video capture board, such as the Osprey 100, which retails for $200.00 to bring in the signal from the video deck or camera. The signal comes in as uncompressed AVI files. They then use the Adobe Premier, which is a high end consumer product, to edit the AVI files. Another commonly used consumer video capture card is the Videum VO consumer card that delivers 24 frames per second performance (30 fps is standard video).

Real Producer is the encoder for the file. Real producer is used to convert the AVI file into the highly compressed real media file.

AVI is uncompressed 700 Kbps stream of data. The Real media file is a heavily compressed G2 with an Intel Codec.

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