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Recording the point cloud from the Kinect requires more bandwidth than your average hard drive provides.

The Kinect produces an XYZRGB point cloud with around 300k points, where each point takes 32 bytes. At 30Hz, that produces about 281 Mb / second. Your average hard disk only supports 100-200 Mb/sec, so the Kinect point cloud just cannot be written quickly enough.

Ivan's solution is correct: You should write the raw disparity and rgb images to disk and only expand them to point clouds during playback.