Re: QC recording application

• Subject: Re: QC recording application
• From: Pierre-Olivier Latour <email@hidden>
• Date: Fri, 19 May 2006 10:35:19 -0700
• Delivered-to: email@hidden
• Delivered-to: email@hidden

I've added a "frame grab" feature to QCTV, and it works fine... except for one really weird problem (unrelated to PPC/Intel).

In FrameMovieExporter.m, in method -exportFrame:timeStamp: (bottom of file),
1) I make a CIImage from the 'frame' variable (a CVPixelBufferRef)
2) Then I make an NSImage from the CIImage
3) Then I write out the NSImage to disk

CIImage *ciImage = [CIImage imageWithCVImageBuffer:frame];
NSImage *nsImage = [ciImage makeNSImage];
[[nsImage TIFFRepresentation] writeToFile:@"/tmp/frame.tiff" atomically:NO];

This all works great, except when I have the video display width set to an exact power of two: 128, 256, 512, 1024, or 2048! When I try to make an NSImage of the frame with these widths, I get diagonal bars (as though the frame is too large, and the scan lines are wrapping). But all widths in between these seem to work perfectly (e.g., 1025, etc.). What is causing this?

You should open a bug on the issue on bugreport.apple.com

________________________________________________________
Pierre-Olivier Latour                            	email@hidden
Quartz Composer Team				Apple Computer, Inc.

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