Autodesk 64006-051108-9001 User Guide - Page 111

QuickTime Scalability, URL links, high-quality frames, QuickTime Effects

Page 111 highlights

QuickTime 103 Placing files on a standard Web (HTTP) server for progressive streaming instead of realtime streaming is easily accomplished. See "Putting QuickTime Online" on page 124. When creating QuickTime files, you have many special options, such as creating Web posters, URL links, high-quality frames, QuickTime Effects, and more. See "Special QuickTime Options" on page 127. QuickTime Scalability QuickTime offers bandwidth scalability through its alternate movies feature. This is generally used for online delivery of different data rate movies, but it can also be used on CD-ROMs, DVD-ROMs, etc. Cleaner makes it easy to create alternate movies, along with the reference file, called a master movie, that points to them. When QuickTime plays the master movie, it chooses the best movie based on the settings the viewer has configured in their QuickTime Settings control panel. You can create as many alternates as you want when encoding the movie and specify the criteria for when particular versions are displayed. This enables delivery of content based on factors in addition to data rate, such as language, platform and CPU speed. Alternates also enable you to use progressive streaming for some data rates and realtime streaming for others. QuickTime does not actually test the connection when it chooses the alternate movie, so if the viewer has not properly configured their settings they may be shown an inappropriate version. Additionally, QuickTime does not currently address changing network conditions (for example, QuickTime does not switch between alternates during playback). When doing realtime streaming, QuickTime servers can compensate for situations where the user does not have enough bandwidth to play the movie being streamed. For example, the Apple QuickTime Streaming Server first drops frames, then drops to keyframes only, then to audio only in bandwidth-limited situations. Progressive Streaming Unlike the other streaming formats, QuickTime offers scalability even when used with an HTTP server, using alternate movies. Even without a QuickTime Streaming Server, the QuickTime Plug-in can still choose an appropriate alternate version for progressive streaming, which makes QuickTime the strongest format for HTTP streaming use.

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QuickTime
103
Placing files on a standard Web (HTTP) server for progressive streaming instead of realtime
streaming is easily accomplished. See “Putting QuickTime Online” on page 124.
When creating QuickTime files, you have many special options, such as creating Web posters,
URL links, high-quality frames, QuickTime Effects, and more. See “Special QuickTime
Options” on page 127.
QuickTime Scalability
QuickTime offers bandwidth scalability through its alternate movies feature. This is generally
used for online delivery of different data rate movies, but it can also be used on CD-ROMs,
DVD-ROMs, etc. Cleaner makes it easy to create alternate movies, along with the reference file,
called a master movie, that points to them.
When QuickTime plays the master movie, it chooses the best movie based on the settings the
viewer has configured in their QuickTime Settings control panel. You can create as many
alternates as you want when encoding the movie and specify the criteria for when particular
versions are displayed. This enables delivery of content based on factors in addition to data
rate, such as language, platform and CPU speed. Alternates also enable you to use progressive
streaming for some data rates and realtime streaming for others.
QuickTime does not actually test the connection when it chooses the alternate movie, so if the
viewer has not properly configured their settings they may be shown an inappropriate version.
Additionally, QuickTime does not currently address changing network conditions (for
example, QuickTime does not switch between alternates during playback).
When doing realtime streaming, QuickTime servers can compensate for situations where the
user does not have enough bandwidth to play the movie being streamed. For example, the
Apple QuickTime Streaming Server first drops frames, then drops to keyframes only, then to
audio only in bandwidth-limited situations.
Progressive Streaming
Unlike the other streaming formats, QuickTime offers scalability even when used with an
HTTP server, using alternate movies. Even without a QuickTime Streaming Server, the
QuickTime Plug-in can still choose an appropriate alternate version for progressive streaming,
which makes QuickTime the strongest format for HTTP streaming use.