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Did you use the camera's own mic or an external one?
Ok, so when you play the video back on the camera is there no sound?I'm also unsure what you mean by 'plugged into the camera's own mic'. The camera's own mic is IN the camera. Did you have an external mic mounted to the camera.
So just to clarify, playing back the video in the camera, you have no sound? You have checked the volume control during playback?