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The lag is in your audio hardware. You need to configure its usage accordingly in the AE prefs and your global prefs. In short: As of CS3 audio that has no adjustments or effects to it is played directly without buffering it to RAM. Hence playback merely depends on having the hardware configured properly. If it is not behaving (maybe it's resampling or doing some of those crappy realtime "enhancements"), AE will slow down the RAM preview so it stays in sync (at least it is supposed to).
no effects on the audio -- it's just straight wav 44.100Khz.
Preferences > Audio Hardware > Built in line output
Preferences > Audio Output Mapping > Built in line output
System Preferences > Sound > Output > Built in line output
All of these settings in any configuration produce the exact same result. Presently set to "built in line output", I have also tried using the USB output and the ones labled "built in line input/built in line output" -- no success, even if all the settings are set to the same line or pointed to different audio hardware. Buffer size also has no effect.
I'm really stumped.
Also, my audio library is on a HDD by itself. I tried hard to set up the machine to not have issues like this...
I'd like to get a MOTU Ultralight for audio recording one day, but I don't think this is a $500 issue now. Plus, I doubt it will make a difference.
I mean 15fps works, but I miss stuff when I'm viewing stop-motion footage. I feel like I wasted a lot of money on hardware and CS3.
Have you tried updating your drivers for the sound card? Like Mylenium said, it's your sound card that stops AE from being real-time.
- Jonas Hummelstrand
My understanding of Mac OS X is that the core audio driver is part of the OS updates?
Also, I have not found any other reports of a Core Audio bug either (except the firewire one).
I know you guys know your stuff...
Do you think we can diagnose this as an OS X Core Audio issue? Should I report a bug to Apple?
I don't think I can update the driver for the USB audio device either. It demonstrates the same fps performance woes.
What if you disable Nucleo?
Oh, right. Try to disable Nucleo and make sure you only have 4 cores for AE's multiprocessing (which should be turned off for the test and always when you use Nucleo.)
Do you by any chance have an Nvidia GeForce 8800 card in your system? It has had some problems with AE's GUI on the Windows side.
Here's a bunch of tips to try:
- Jonas Hummelstrand
Yeah. Tried disabling Nucleo Pro to no avail. Hovers at 23fps just the same. And definitely no multiprocessing.
I do have the Nvidia GeForce 8800 GT. Seems like a stretch for a seemingly audio issue, but I'll start looking that way. ...new hardware... (!!) Yeah, perhaps it could be a sluggish video issue when audio is checked... hmm.
Also, I have the stock QT Pro 7.4.1 that came with the OSX Leopard install -- I believe I'm safe there?...
Jonas, thank you. Your website has already been helpful.
...never heard of the "secret" preferences menu before.
Are you watching your video at 100% magnification?
I'm stumped. I have a similar setup and haven't had any problem RAM previewing even 1080p clips with audio.
100% magnification yes. However, 25% plays at 23fps too -- it makes absolutely no difference. Yeah it's weird. It seems it has no issues with video definition -- just if it has audio or not.
Navarro, do you have a 2008 MP w/ Nvidia 8800 GT?
Whoohoo.... sounds like it's evolving into one more case where the GF8800 strikes (potentially a PCI timing problem on multicore systems which might affect your audio hardware???). Do you have any other audio processing programs at hand that use a similar scheme to AE (Soundtrack Pro, Soundbooth)? If so, do they play audio with distortions and/ or are you able to view video files in them without loosing sync? Also, and this might be a stretch, if case you might have dual boot: Do similar problems occur if you boot into Win XP/ Vista?
Yup -- Nvidia 8800 with 3.0 8-Core.
Soundtrack works fine. Audio always plays fine.
Seems the Nvidia card is an unlikely suspect.
I think the only thing left is to completely uninstall AE and try again (again). I'll probably just keep the RAM preview set to 15fps and everything should be fine, or possibly if there's another update/upgrade in the AE family...