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Rendering compositions to QuickTime movie

Hi everyone,

I am currently working on a small utility that renders some compositions using an Objective-C application. This application runs fine with a user interface and using a standart graphical session, however running it when no sessions are opened is impossible unless running it as root. My code is based on QuartzComposer_WWDC_QCTV and QuartzComposerOffline and has to run as user nobody without a session opened. The foolowing errors appear when launching as root:

2006-02-15 16:52:13.151 XgridAddVideoIntroduction[26624] invalid pixel format attribute
2006-02-15 16:52:13.151 XgridAddVideoIntroduction[26624] invalid pixel format
2006-02-15 16:52:13.152 XgridAddVideoIntroduction[26624] invalid context
2006-02-15 16:52:13.176 XgridAddVideoIntroduction[26624] Failed init framereader
2006-02-15 16:52:13.177 XgridAddVideoIntroduction[26624] *** Uncaught exception: <NSGenericException> -[QCRenderer initWithOpenGLContext:pixelFormat:file:]: Argument "context" cannot be null
Trace/BPT trap

Pixel attributes used are : {NSOpenGLPFAAccelerated, NSOpenGLPFANoRecovery, NSOpenGLPFADoubleBuffer, NSOpenGLPFADepthSize, 24, 0}
Does anybody have a solution ? Is this even possible ?


Thanks a lot.

--
Augustin Prats

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