What's New in QuickTime 5
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Track Class Changes
Additional track element:
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annotation by numeric index, by name, by ID
Additional properties.
The following is useful with any track:
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data format international text [r/o] -- the data format
The following are useful with video tracks:
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transfer mode dither copy/no dither copy/blend/transparent/straight alpha/premul white alpha/premul black alpha/straight alpha blend/composition -- the transfer mode of the track
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transfer mode RGB color -- the operation color of the track. Note that not all transfer modes use this value.
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high quality boolean -- is the track high quality?
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single field boolean -- is the visual track single field?
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preload boolean -- should the track be preloaded?
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never purge boolean -- never purge the track?
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data rate integer [r/o] -- the data rate (bytes/sec) of the track
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video depth small integer [r/o] -- the color depth of the video
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is video gray scale boolean [r/o] -- is the video gray scale?
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href international text [r/o] -- the internet location to open when clicking on the track
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chapterlist reference -- text track to use as chapter list for this track
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contents type class -- the contents of the track. This is useful for getting or setting chapter track contents all at once. For example: set contents of chapter_track to {"Chapter 1", "Chapter 2", "Chapter 3"}
The following are useful with audio tracks:
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audio sample rate small real [r/o] -- the sample rate of the audio in kHz
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audio channel count small integer [r/o] -- the number of channels in the audio
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audio sample size small integer [r/o] -- the size of uncompressed audio samples in bits
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is audio variable rate boolean [r/o] -- is audio variable bitrate?
The following are useful with streaming tracks:
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streaming bit rate small real [r/o] -- bit rate in bits/second for all streams in track
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streaming quality small real [r/o] -- percent of packets received for all streams in track
© 2001 Apple Computer, Inc.
What's New in QuickTime 5
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