topic Re: Audio issue on usb on Canon 5d Mark III in EOS DSLR & Mirrorless Cameras

Audio issue on usb on Canon 5d Mark III

marcojj — Tue, 19 Sep 2017 11:29:25 GMT

Hi all,

I have this kind of problem.

I record video with a canon 5d Mark III with an external usb mic connected to my macbook.

Headphones output of the mac is connected to the Canon mic in.

There is no problem, all works well.

But now I'd like to control camera through Canon utilities.

I connect the usb cable to the same macbook and all works well BUT when I activate the liveview to review the setup and start the record, a terrible noise (like a buzz) is present in all the record.

If I disable the liveview all works well (but I can't control camera).

I tought that there is an audio loop created by the liveview, so I bought an usb audio in/out to use with aufiohijack to put mic audio on a different output, but nothing changes.

I also downloaded an app that limits audio on specific apps, no solution.

Someone can help me???

thanks!!!

Re: Audio issue on usb on Canon 5d Mark III

kvbarkley — Tue, 19 Sep 2017 14:40:37 GMT

You might try a USB isolator.

Re: Audio issue on usb on Canon 5d Mark III

Ray-uk — Tue, 19 Sep 2017 18:10:13 GMT

I think you need a separate microphone that plugs directly into the camera.

The earphone output of your laptop will probably be a low impedance of anything from 4 to 32 Ohms, minimum input impedance of the camera is 200 Ohms, as well as giving you a severe mismatch this could result in overloading the camera input with too high a signal.

There is full information from Canon here:

https://support.usa.canon.com/kb/index?page=content&id=ART134116

Re: Audio issue on usb on Canon 5d Mark III

kvbarkley — Tue, 19 Sep 2017 18:13:36 GMT

Or get one of the attenuating cables I used to get at Radio Shack.

Re: Audio issue on usb on Canon 5d Mark III

marcojj — Tue, 19 Sep 2017 19:23:09 GMT

Thank you for the answer... but the in/out conbination works very well when Canon Utility is not in liveview mode. Also with usb connected. The problem come out only when live view is on. I don't think it's an impedance issue...

Re: Audio issue on usb on Canon 5d Mark III

kvbarkley — Tue, 19 Sep 2017 19:24:34 GMT

Then you might need the USB isolator, Adafruit makes one.

Re: Audio issue on usb on Canon 5d Mark III

Waddizzle — Tue, 19 Sep 2017 23:04:10 GMT

@marcojj wrote:
Thank you for the answer... but the in/out conbination works very well when Canon Utility is not in liveview mode. Also with usb connected. The problem come out only when live view is on. I don't think it's an impedance issue...

No, it doesn't. You just think it works well. Use a proper connection.

Let me share with you some science. First and foremost, there is no such thing as electricity. There are smoke particles running around inside of wires, just like water in a garden hose. When you make a bad connection, the electronics springs a leak, and some of the smoke gets out. Once that happens, that piece of gear is shot.

So, remember, there is no electricity, just smoke. Make sure that you don't let the smoke out. Okay?

Re: Audio issue on usb on Canon 5d Mark III

marcojj — Wed, 20 Sep 2017 17:27:07 GMT

Many thanks fot the complete answer! And thank you all...

Well, I've understood that it's a "gound issue"... sorry for the terms, but I'm italian and my english is not so good.

Today I've bought a bluetooth recevier, cheap but guaranteed without lags.

A usb isolator is expensive, another "analogic" mic must be used "directly" and I'd like to process sound before (I have no outboard)... So, tomorrow I will receive the bluetooth receiver from amazon, hope it will works...

Re: Audio issue on usb on Canon 5d Mark III

kvbarkley — Wed, 20 Sep 2017 17:40:19 GMT

You paid for a Canon 5D MIII, and $35 is expensive?

Re: Audio issue on usb on Canon 5d Mark III

marcojj — Wed, 20 Sep 2017 17:51:29 GMT

no no 😄 sorry, I don't explained well.

At the moment I'm using a quiet good mic. I've no problem to buy a good mic, also an expensive one. But now I'm processing voice with a compressor, a gate and an equalizer. All virtually with my mac with a quiet good result. If I'd buy a condenser mic, I shoud need all outboard with a clutter space, line calbes and power cords... It should be complicated, as I'm all running on battery with few cables... This is the only reason 🙂

Re: Audio issue on usb on Canon 5d Mark III

kvbarkley — Wed, 20 Sep 2017 18:07:18 GMT

At this point I think you are better served with an external recorder - like a Zoom - and sync the audio in Post.

Re: Audio issue on usb on Canon 5d Mark III

marcojj — Wed, 20 Sep 2017 18:41:32 GMT

Well I considered too this option, as controlling all without recording audio on camera, I can record on hard disk. After I could sync on post. The problem is that I always record and stop, so I don't have only one audio track. In post I have so sync many audio track... workflow should be longer...

Re: Audio issue on usb on Canon 5d Mark III

RobertTheFat — Thu, 21 Sep 2017 20:45:30 GMT

@Waddizzle wrote:
@marcojj wrote:
Thank you for the answer... but the in/out conbination works very well when Canon Utility is not in liveview mode. Also with usb connected. The problem come out only when live view is on. I don't think it's an impedance issue...
No, it doesn't. You just think it works well. Use a proper connection.

Let me share with you some science. First and foremost, there is no such thing as electricity. There are smoke particles running around inside of wires, just like water in a garden hose. When you make a bad connection, the electronics springs a leak, and some of the smoke gets out. Once that happens, that piece of gear is shot.

So, remember, there is no electricity, just smoke. Make sure that you don't let the smoke out. Okay?

I'm not an electrical engineer, and I think Waddizzle is. But I have studied a bit of physics, and I don't think I'd have put it just that way.

Re: Audio issue on usb on Canon 5d Mark III

Waddizzle — Thu, 21 Sep 2017 22:54:18 GMT

@RobertTheFat wrote:

I'm not an electrical engineer, and I think Waddizzle is. But I have studied a bit of physics, and I don't think I'd have put it just that way.

Yes, Bob, I am an electrical engineer. But, if you watched me work, you'd swear that I was a software developer.