Click the Audio Recording tab on the oCam main screen.
If you press the record button, only the sound will be recorded. By default, MP3 files are created, and you can use other codecs besides MP3 by clicking the codec button.
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Change the sample rate to another value in Settings-Record-Audio Device Settings and try recording again. (This problem is caused by the system's sound device not supporting the default 44100 sample rate.