I produced a video using the Apple HD profile under devices and the audio was really very loud, so I imported the video that I just produced and lowered the volume. When I produced the video again SVRT was selected, but the final video was solid gray with an occasional splash of pixelated cubes. It was obviously corrupted. Tried it again with the same result. It was the iPod/iPhone profile, I think. Just FYI if anyone else cares to try it out and verify the findings.
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CORNBLOSSOM