Syncing of audio tracks + multichannel questions
Syncing of audio tracks + multichannel questions
- Subject: Syncing of audio tracks + multichannel questions
- From: Dave Addey <email@hidden>
- Date: Sat, 10 Jan 2004 00:39:48 +0000
Hello there CoreAudio list (this was posted to AT API list too),
I remember hearing in the WWDC QuickTime presentation that a new version of
QT would be featuring the "Sound Manager 2", one feature of which would be
sample-accurate synchronisation of tracks in a QuickTime movie. Is this
coming in the next version (perhaps alongside the upcoming multichannel
audio)? Will this mean that (for example) MP3 audio tracks will be synced
exactly, rather than just being synced to the nearest MP3 sample size (about
0.03 sec for a 44100Hz track, I think)? I currently sync two identical MP3
tracks in one movie, but output each track to a different audio device for
live and cue DJ purposes, and they're never quite in sync, resulting in
bogus 'latency' :-(
Second question - in the upcoming multichannel audio code, will it be
possible to:
A) output both channels of a stereo audio track to one channel on a
CoreAudio output device such as the Emagic 2:6? (i.e. stereo track mapped
to mono output without the need to resample)
B) output one stereo audio track to more than one stereo output device (e.g.
output the same track to both the built-in Mac audio and also an iMic), with
different volumes for each device? I'm thinking of this especially to avoid
the need to duplicate the track as described above.
It'd be great if these things were possible! Any comments much appreciated
(and best of luck in getting the multichannel code finished :-) )
Dave.
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