New answers tagged stereo
Verify again that your source is indeed a stereo source and that your cabling is TRS cabling. I own this same camera and have been able to record audio in full stereo and also on only one side of the stereo spectrum.
According to the Using Commercially Available Microphones section on page 76 of the manual for the HF G20, it should be possible to connect a stereo microphone to the external mic connection. There may be some problem with the kind of a source you are using or the way you are connecting it.
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