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Lancashire soundie

4 channels audio over radio camera on OB

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I need an answer for a question which may come up soon.  Possibly up to 4 presenters on handheld stick mics, feeding 2 radio receivers on the back of an RF camera on an OB.  Is it possible to feed those 4 channels into the camera (no, I don't know the camera model yet) and have them fed over the digilink via SDI, to the truck, so the audio mixer can control the levels independently?

 

Or I give the audio assistant following the RF cameraman a simple mixer and 4 channels of radio, and have him mix them and give the camera a mono feed.

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Out of curiosity, "up to 4 presenters on handheld stick mics, feeding 2 radio receivers" - 2 x dual channel RX into a 4 channel camera or something else?

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Make sure, SDI can transport 4 channels of audio and not two. Is this what you ask?

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You could consider bypassing the camera and feeding the audio using an SDI audio embedder after it comes out of the camera

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Brilliant, thanks guys.  I'll bookmark that little box in case it comes up.  I'm just hedging bets at the moment, trying to get production interested in having 4 radio sticks instead of 2 [ugly] wired mics shared between 3-4 people.

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Thanks for this interesting thread. questions: if the link from camera to the truck is wireless, how would you go about inserting the 4 audio tracks into the Black Magic box? you would still need either a wireless AES link (times two for 4 tracks), or 4 analog feeds into the box. Maybe you'll get lucky and the camera will have the appropriate inputs on board. The Black Magic box would work, but might get a bit clunky in practice as it will require 12v DC and uses 1/4" TRS inputs to complicate things. Because the box is post video processing coming out of the camera,there would be no delay/offset for sync. Direct input to camera, bypassing the box would obviously be a simpler workflow.

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If it’s a camera with AES inputs (Sony F5/F55, Arri Amira, etc) you can feed it 4 channels. Sticking 2 SRc units on there would be unwieldy, but would work with their AES backplates. I’ve fed 4 channels into an F5 several times, hard lined via a 633 with no issues. And SDI can carry up to 8 audio channels, for what it’s worth. 

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I’d say keep it simple.  Feed the camera good sound whether that’s a good mix on one or two tracks or four discrete iso tracks and it will travel along with the picture however they send it. 

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Lectrosonics D4 can send 4 channels of audio. RX can output analog or AES.

I have been using this as a camera hop for a number of years (when not using a G3 scratch track). Likely some are familiar with it and some are not. 

It has it's pros and cons (which I won't get into), but can be helpful in the odd 4 channel send situation.

https://www.lectrosonics.com/US/Digital-Wireless-System/category.html

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