What's New in QuickTime 5

Track Class Changes

Additional track element:

Additional properties.

The following is useful with any track:

The following are useful with video tracks:

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
transfer mode RGB color -- the operation color of the track. Note that not all transfer modes use this value.
high quality boolean -- is the track high quality?
single field boolean -- is the visual track single field?
preload boolean -- should the track be preloaded?
never purge boolean -- never purge the track?
data rate integer [r/o] -- the data rate (bytes/sec) of the track
video depth small integer [r/o] -- the color depth of the video
is video gray scale boolean [r/o] -- is the video gray scale?
href international text [r/o] -- the internet location to open when clicking on the track
chapterlist reference -- text track to use as chapter list for this track
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:

audio sample rate small real [r/o] -- the sample rate of the audio in kHz
audio channel count small integer [r/o] -- the number of channels in the audio
audio sample size small integer [r/o] -- the size of uncompressed audio samples in bits
is audio variable rate boolean [r/o] -- is audio variable bitrate?

The following are useful with streaming tracks:

streaming bit rate small real [r/o] -- bit rate in bits/second for all streams in track
streaming quality small real [r/o] -- percent of packets received for all streams in track

What's New in QuickTime 5