I'm sorry about the issue. The Canon camcorder model Vixia HF R50 does not have the direct option to turn off audio / microphone, but there are a couple of solutions:
- Set the camera to shoot in the Manual mode. Then in the FUNC menu, set the Audio Scene setting to option Custom Setting. This allows you to manually adjust the audio recording levels in the FUNC menu. You can zero them out, so that no audio will be recorded.
- Insert a "dummy" plug into the external microphone jack. This is similar to plugging in a real microphone, but having no sound signal coming into the camcorder.
Do you have any further question? Also, do you need the camcorder manual and/or anything else?
Please reply at the box below. Thank you,