Lancashire soundie Posted October 20, 2018 Report Share Posted October 20, 2018 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. Quote Link to comment Share on other sites More sharing options...
daniel Posted October 20, 2018 Report Share Posted October 20, 2018 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? Quote Link to comment Share on other sites More sharing options...
VASI Posted October 20, 2018 Report Share Posted October 20, 2018 Make sure, SDI can transport 4 channels of audio and not two. Is this what you ask? Quote Link to comment Share on other sites More sharing options...
Lancashire soundie Posted October 20, 2018 Author Report Share Posted October 20, 2018 AFAIK SDI can cover 16 channels, but my question is more about getting the audio into the camera/transmitter. Quote Link to comment Share on other sites More sharing options...
ryanpeds Posted October 20, 2018 Report Share Posted October 20, 2018 You could consider bypassing the camera and feeding the audio using an SDI audio embedder after it comes out of the camera Quote Link to comment Share on other sites More sharing options...
Shastapete Posted October 20, 2018 Report Share Posted October 20, 2018 It depends on the camera, or as ryanpeds suggested, embed the audio into the sdi stream after it comes out of the camera before it hits the transmitter. There's a box from Blackmagic design that can do it. $300 https://www.blackmagicdesign.com/products/miniconverters/techspecs/W-CONM-05 Quote Link to comment Share on other sites More sharing options...
Lancashire soundie Posted October 20, 2018 Author Report Share Posted October 20, 2018 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. Quote Link to comment Share on other sites More sharing options...
chrisnewton Posted October 30, 2018 Report Share Posted October 30, 2018 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. Quote Link to comment Share on other sites More sharing options...
Paul Katzman Posted November 10, 2018 Report Share Posted November 10, 2018 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. Quote Link to comment Share on other sites More sharing options...
Derek H Posted November 10, 2018 Report Share Posted November 10, 2018 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. Quote Link to comment Share on other sites More sharing options...
Eric Posted November 11, 2018 Report Share Posted November 11, 2018 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 Quote Link to comment Share on other sites More sharing options...
PCMsoundie Posted January 2, 2019 Report Share Posted January 2, 2019 On 11/10/2018 at 1:10 PM, Paul Katzman said: 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. I've also done this half a dozen times. Sony PDW-F800, F55, Amira. Using SD633, 552, 788T, 688 units. HD-SDI carries 16 channels of AES. The most I've seen available is 8 channels using a VCR such as a Sony PMW-1000 XDCAM SxS Memory Recording Deck but that is really just displaying 8 channels on playback. For AES digital in it is usually just 4 channels on camera, VDRs, if you use an audio embedder it will take up to 16 but you may require 2 embedder units to add audio to 16 channels since each one can only add 8 channels. Some really expensive units allow access to 16 channels of AES input on 8 BNCs such as AJA FS-1 frame synchonizer. Quote Link to comment Share on other sites More sharing options...
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