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Well, it's PCM audio, so the uncompressed makes sense. I'm not seeing any cpu spike though. Things to check: Are any audio filters enabled? Is ffdshow being inserted more than once? (Info - multiple instances - should be set to only one, check previous.) Is audio being output in a format your drivers are having trouble with? (16bit integer is the most compatible.)
You can try building a graph in graphedit to see if anything looks out of place, as well.
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