Codec specific 10bit noise

Subject: Codec specific 10bit noise
From: Christian Schroeder <email@hidden>
Date: Mon, 9 Jul 2007 09:22:38 +0200
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Hi,

I'm facing some problems creating quicktime movies with 10-bit color information. In my current workflow I create a CVPixelBufferRef by calling CVPixelBufferRefCreateWithBytes, passing k64ARGBPixelFormat and a bit plane of type unsigned short. The CVPixelBufferRef is then passed to an ICMCompressionSession for encoding.

This works fine for the 'Apple Uncompressed 10-bit 4:2:2' codec but produces random colorful noise for 'Apple ProRes 422 (HQ)' and other 3rd party 10-bit codecs. The only color passing though correctly is pure black. To me this looks like Quicktime misinterprets the pixel format as 8-bit and just uses the lower byte of the short values to construct the image.

What am I doing wrong?

Thanks, Christian _______________________________________________ Do not post admin requests to the list. They will be ignored. QuickTime-API mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: This email sent to email@hidden Follow-Ups: Re: Codec specific 10bit noise From: Andreas Wittenstein <email@hidden> Prev by Date: Splitting a 3gp video with Quick time for Java SDK Next by Date: Getting name of audio compressor Previous by thread: Splitting a 3gp video with Quick time for Java SDK Next by thread: Re: Codec specific 10bit noise Index(es): Date Thread Home Archives Terms/Conditions Contact RSS Lists About Visit the Apple Store online or at retail locations. 1-800-MY-APPLE Contact Apple | Terms of Use | Privacy Policy Copyright © 2011 Apple Inc. All rights reserved.