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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
<html>
<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="home" href="http://developer.apple.com/">
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<script language="JavaScript" src="../../documentation/js/adc.js" type="text/javascript"></script>
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<title>CocoaVideoFrameToGWorld</title>
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<td scope="row"><img width="340" height="10" src="images/1dot.gif" alt=""></td>
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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/QuickTime/index.html">QuickTime</a> > <a href="../../samplecode/QuickTime/idxMovieBasics-date.html">Movie Basics</a> >
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<td><h1><div id="pagehead">CocoaVideoFrameToGWorld</div></h1></td>
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<p><strong>Version:</strong> 1.0</p>
<p><strong>Posted:</strong> 2003-01-14</p>
<p><strong>Build Requirements:</strong> N/A</p>
<p><strong>Runtime Requirements:</strong> Mac OS X Mac OS X</p>
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<p><strong>View Source Code:</strong>
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<option value="listing1.html">/main.m</option>
<option value="listing2.html">/MyObject.h</option>
<option value="listing3.html">/MyObject.m</option>
<option value="listing4.html">/MyQuickDrawView.h</option>
<option value="listing5.html">/MyQuickDrawView.m</option></select>
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<p><strong><a href="CocoaVideoFrameToGWorld.zip">Download Sample</a></strong> (“CocoaVideoFrameToGWorld.zip”, 108.5K)<BR>
<strong><a href="CocoaVideoFrameToGWorld.dmg">Download Sample</a></strong> (“CocoaVideoFrameToGWorld.dmg”, 159.4K)</p>
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<td scope="row">
<h2>Description</h2>
<p>This sample demonstrates how to step frame-by-frame through a QuickTime movie using the GetNextInterestingTime function, drawing each frame of the movie into a GWorld using a decompression sequence. Finally, the contents of the GWorld are drawn into a Cocoa NSQuickDrawView. Simply launch the application, and at the prompt, select a movie file to display. Press the "NextFrame" button to advance frame-by-frame through the movie (note: for MPEG-4 movies the above technique will work, but not MPEG-1 or 2 because with these movie files all frames are treated as a single large sample in the movie). Requirements: Mac OS X Keywords: NSQuickDrawView video frame step GetNextInterestingTime</p>
<h2>Document Revision History</h2>
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<th width="100">Date</th>
<th width="580">Notes</th>
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<tr><td scope="row">2003-01-14</td><td>Demonstrates how to draw each frame of a QuickTime movie into a Cocoa NSQuickDrawView. </td></tr>
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<th>Did this document help you?</th>
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