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Intel-only issue with QCRenderer -initWithOpenGLContext:::

Subject: Intel-only issue with QCRenderer -initWithOpenGLContext:::
From: Roland Torres <email@hidden>
Date: Wed, 17 May 2006 12:29:02 -0700
Delivered-to: email@hidden
Delivered-to: email@hidden

I have an ObjC app that displays live video into an NSOpenGLContext using a simple QC Video Input / Billboard composition. It all works quite well.

On PPC machines (G5, 10.4.6, Xcode 2.2.1), this line works flawlessly:

    renderer = [[QCRenderer alloc] initWithOpenGLContext:_glContext
                                             pixelFormat:_glPixelFormat
                                                    file:path];

But on Intel (with either Intel native code, or Rosetta'd PPC code), I get this:

*** Message from <QCVideoInput = 0x13A49FB0 "VideoInput_1">:
    Sequence grabber settings restoration failed (error -2004)

The code continues, but the resulting video looks "ghostly" and greatly overexposed, almost as if it were inverted, but not quite.

The parameters to the call all seem legit, as far as I can tell:

(gdb) p renderer $1 = (class QCRenderer *) 0x13a5fd80 (gdb) p _glContext $1 = (class NSOpenGLContext *) 0x13a590e0 (gdb) p _glPixelFormat $2 = (class NSOpenGLPixelFormat *) 0x13a5ddf0 (gdb) p path $3 = (class NSString *) 0x13a4b530 (gdb) po path /Users/Roland/Video/build/Development/Video.app/Contents/Resources/ LiveVideo.qtz

Can anyone offer possible causes for this? Again, it works fine on PPC. But even if I run a PPC version on Intel via Rosetta, I still get the same error message and video problem. And, I can run the LiveVideo.qtz composition directly in QC and it works fine. I've tried this with both the internal iSight and an external one, with no difference.

Roland

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