PROBLEM: I have been doing photography and videography with this camera for 6 months now. Typically, I utilize a Rode Wireless lapel mic. While using it the other day, I noticed the audio inputs suddenly redline with the interference you will hear in this clip. I unplugged the mic, thinking it the onboard would do better, but it didn't change. The audio is still unusable.
TROUBLESHOOTING: The sound is not wind. There was no breeze. I've worked in construction sites many times with this setup and have never had a problem. We stepped outside to see if there was some issue with being in the building, but the problem continued. I was using a battery pack extension and when I returned to my office, I removed it and used a standard Canon battery; the issue lessened, but persisted–even just using the onboard mic.
I cannot understand where the issue began or why. Has anyone else had audio issues with Canon DSLRs like this before?
I was able to view the video where we can hear the audio issue. It does sound like if it was wind against the microphone but you have stated that there was no wind in the shooting environment. There does appear to be a lot of clipping and heavy distortion in the audio track. One test we can perform is to use the built-in microphone and set the mic level to Auto. In a quiet room, perform a test by talking towards the camera.
If the issue is present then we would suggest to send the EOS 6D Mark II to our facility for repair. In case the audio issue is not present then let's check a different external microphone with the camera. You may also clean the connectors with a dry microfiber cloth to ensure they're free from debris.
Canon U.S.A., Inc. has created a new online repair portal that allows you to set up service in a few simple steps. The repair portal gives you the ability to set up service for multiple pieces of equipment at once, and to receive a repair estimate in the majority of cases, depending on your model and issue. The portal also allows you to upload images or videos that will assist us in repairing your product. You can also select how you wish to be notified of the progress of your repair. The portal's service history section allows you to view all services that have been performed on any of your camera or video products since January 7, 2020.
Please follow the link below to access our online repair portal to arrange for service:
Instructions for Accessing and Using the Online Repair Portal.
You will need to access or create your My Canon Account.
If you already have a My Canon Account and your product is already registered, simply click on the “Get Repair Services” link on the left menu and follow the onscreen instructions to arrange for service for your product.
If you have a My Canon Account and your product is not registered, you must register your product first. Click on the “Get Repair Services” link on the left menu, then click on the “Register Product” link on the right. After your product is registered, click on the “Get Repair Service” link on the left menu and follow the onscreen instructions to arrange for service for your product.
If you do not have a My Canon Account, you will need to create one. After you create your account, click on the “Add Product” link to register your first product. After your product is registered, click on the “Get Repair Service” link on the left menu and follow the onscreen instructions to arrange for service for your product.
Once you have completed the repair request, you will have an opportunity to print a copy of the request for your records. This request form will also contain shipping instructions and an address label that you will attach to the outside of your shipping box when mailing your equipment for repair.