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10.5: A possible fix for an iChat 'Camera in use' error Apps
With an Intel iMac running Leopard, I kept getting an error that the built-in iSight was in use. To fix this problem, I now do this from Terminal as an admin user, and I can again use the camera:
$ sudo killall VDCAssistant
I do not even have to restart iChat for the fix to take effect. The way I deduced this is that I ran sudo lsof | less -i, searched for usb, and found this VDCAssistant process using some VDC (whatever that is) library that the QuickTime component of iChat was using, too. So I decided to kill that process.

The system respawns the VDCAssistant process, but after that, the iSight camera can be used again in iChat -- at least until it suddenly becomes unusable again, for no particular reason I can determine.
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10.5: A possible fix for an iChat 'Camera in use' error | 3 comments | Create New Account
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10.5: A possible fix for an iChat 'Camera in use' error
Authored by: vocaro on Aug 08, '08 04:42:36PM
Apparently, VDCAssistant is what is loaded when user accounts takes a picture of you.

http://forum.insanelymac.com/index.php?showtopic=100897



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10.5: A possible fix for an iChat 'Camera in use' error
Authored by: jcrossley on Aug 12, '08 01:01:17AM

I've seen the camera's LED glowing when I'm not using it. This may be related to your problem. I found that opening the "Video Preview" window from the Video menu, then closing it will return the camera to it's normal state.



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10.5: A possible fix for an iChat 'Camera in use' error
Authored by: shayzu on Aug 22, '08 11:31:22PM

Hi

I was so disappointed to reveal that this fix was irrelevant for me!!
I am running OSX version 10.5.4 and unfortunately, the process VDCAssistant did not exist in lsof's output or any of the other suggestions that were provided.

Thanks!!

Shay



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