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Re: [QuickTime] Mixing with Apple QuickTime API:
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Re: [QuickTime] Mixing with Apple QuickTime API:

Is it possible to do mixing of audio files "on the fly"? An example I
have in mind would be mixing 2 or more channels (with an upper limit
of say, 8) for simultaneous playback; does the QuickTime API support
this?
I guess the mpeg 4 standard can allow up to 64 channel audio (is that
correct?); in
practice I think we (university types) usually work with fewer
channels than that;
any guidance here is much appreciated, thanks!!

QuickTime mixes all the audio tracks in a movie as it plays the movie. If you've got all the data in a single multi-channel file, whose filetype is supported for import, then that's all you need. Otherwise, you can construct a movie containing the data from all the audio files you want to mix, by opening those files programmatically and copying tracks into a destination movie. [You need only copy by reference, which is very inexpensive, since the media isn't actually copied.]

The APIs are documented at <http://developer.apple.com/quicktime/>. Or you can do all this manually in QT Player if you have the Pro Key.

Daniel Steinberg
QuickTime Engineering
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References: 


 >[QuickTime] Apple Lossless with old QuickTime API? (From: Alexander von Below <email@hidden>)


 >Re: [QuickTime] Apple Lossless with old QuickTime API? (From: Geoff Brown <email@hidden>)


 >Re: [QuickTime] Apple Lossless with old QuickTime API? (From: Greg Chapman <email@hidden>)


 >[QuickTime] Mixing with Apple QuickTime API: (From: <email@hidden>)























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