Autodesk 64006-051108-9001 User Guide - Page 141
Real 10, Real 10 Scalability, Streaming Real 10 Files
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Real 10 133 Real 10 Real 10 is a streaming-media architecture developed by RealNetworks. Real 10 offers realtime streaming delivery from a RealServer. Users can view Real 10 files with a player application available from RealNetworks at http://www.real.com. Real 10 is most appropriate for network delivery of audio, video and other media types, such as text and Flash animations. It is less suitable for CD-ROM or DVD delivery due to the more demanding CPU requirements at higher bandwidths. Real 10 files cannot be edited or recompressed once they are encoded into the Real 10 format. Real 10 Scalability When used with a dedicated RealServer, Real 10 offers excellent scalability through its SureStream feature. This enables you to create up to eight different audio and video tracks that are specifically encoded for the most common user connections. During playback, RealPlayer and RealServer continually communicate and can repeatedly switch between versions to deliver the highest-quality stream that the viewer connection can support at any given time. This realtime switching effectively handles changing network conditions, such as net congestion. Switching of audio and video is handled independently and you can indicate whether the video or audio should be given preference if the viewer's throughput drops. In addition to SureStream, RealPlayer can also drop frames/degrade the image quality to maintain realtime playback over slower connections. In extreme cases, RealPlayer can omit the video track entirely and play only the audio track. To achieve scalability, Real 10 must be used with the RealServer software. Streaming Real 10 Files Real 10 SureStream feature is used in conjunction with the RealServer. It enables you to easily create multiple streams within a single file to handle changing network conditions and different user connections. All the versions of the movie are contained within one large file. You simply place this one file on your server, and the RealPlayer and RealServer communicate to choose the correct stream during playback. To create a multi-stream SureStream file: 1. Click a RealMedia preset, or click the Output tab and choose RealMedia in the Format menu. 2. In the Output tab, enable Options and click Set to display the Real 10 Export Settings dialog. 3. Set the Optimize for option to Streaming. 4. In the list, select the streams you want to include in the SureStream file.