Autodesk 64006-051108-9001 User Guide - Page 116

QuickTime Movie Suffix, QuickTime Streaming, Preparing Movies for RealTime Streaming

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108 Chapter 7: Formats QuickTime Movie Suffix The standard QuickTime suffix is .mov - using this suffix is very important for online movies. To add this suffix to movies, use the Suffix option in the Output tab of the Settings dialog. Note: Do not use .qt as the suffix. QuickTime Streaming In addition to progressive streaming (a.k.a. HTTP streaming), QuickTime 4 and later support realtime streaming with a QuickTime Streaming Server. You can use alternate movies with QuickTime Streaming. See "Alternates and Streaming" on page 109. Preparing Movies for RealTime Streaming When processing files for realtime streaming, there are a few things you should do differently than when processing files for progressive streaming or CD-ROM use. To prepare a movie for realtime streaming, simply check the Prepare for Streaming Server option in the Output tab of the Settings window. This option automatically sets the "hinting" instructions that tell the QuickTime Streaming Server how and when to send packets of media over the Internet. Cleaner hints any file that has the Prepare for Streaming Server option checked in the Output tab. Note: A file prepared for realtime streaming also works for progressive streaming from a Web server. But because QuickTime hint tracks make the movie larger, you should uncheck Prepare for Streaming Server when creating movies for progressive streaming. Force Block Refresh The Force Block Refresh rate determines how many seconds elapse before the entire image is reconstructed if previous image data is missing. Image loss frequently occurs when viewers randomly access a different portion of the movie, such as fast forwarding, or from data loss over the network. As sections of the video change over time, the codec automatically draws the temporally different parts of the image. The Force Block Refresh option makes the codec update parts of the video that are not changing on their own. The effect of image loss and block refresh is rather distinctive when you watch a streaming video. Often, the image starts totally black. As the video is streamed in, areas of movement are rapidly drawn, while static sections are slowly drawn over time. This often looks like some sort of high-tech, blocky fade-in transition.

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Chapter 7: Formats
108
QuickTime Movie Suffix
The standard QuickTime suffix is .mov — using this suffix is very important for online movies.
To add this suffix to movies, use the Suffix option in the Output tab of the Settings dialog.
Note:
Do not use .qt as the suffix.
QuickTime Streaming
In addition to progressive streaming (a.k.a. HTTP streaming), QuickTime 4 and later support
realtime streaming with a QuickTime Streaming Server.
You can use alternate movies with QuickTime Streaming. See “Alternates and Streaming” on
page 109.
Preparing Movies for RealTime Streaming
When processing files for realtime streaming, there are a few things you should do differently
than when processing files for progressive streaming or CD-ROM use.
To prepare a movie for realtime streaming, simply check the Prepare for Streaming Server
option in the Output tab of the Settings window. This option automatically sets the “hinting”
instructions that tell the QuickTime Streaming Server how and when to send packets of media
over the Internet. Cleaner hints any file that has the Prepare for Streaming Server option
checked in the Output tab.
Note:
A file prepared for realtime streaming also works for progressive streaming from a Web
server. But because QuickTime hint tracks make the movie larger, you should uncheck Prepare
for Streaming Server when creating movies for progressive streaming.
Force Block Refresh
The Force Block Refresh rate determines how many seconds elapse before the entire image is
reconstructed if previous image data is missing. Image loss frequently occurs when viewers
randomly access a different portion of the movie, such as fast forwarding, or from data loss
over the network.
As sections of the video change over time, the codec automatically draws the temporally
different parts of the image. The Force Block Refresh option makes the codec update parts of
the video that are not changing on their own.
The effect of image loss and block refresh is rather distinctive when you watch a streaming
video. Often, the image starts totally black. As the video is streamed in, areas of movement are
rapidly drawn, while static sections are slowly drawn over time. This often looks like some sort
of high-tech, blocky fade-in transition.