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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Red Audio - twice the bitrate for 2 channels?

Greg Voevodsky

Greg Voevodsky

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I haven't heard much about the audio lately. But I'd like to know, if it isn't very difficult - to have a choice to use only 2 channels at say 24bit/96kHz rather than all 4 channels at 16 / 24 bit, 48KHz?

In other words, same amount of data rate but only using 2 channels instead of 4. Is that hard to do? If not, can we have that as an option in the menu setup please?
 
As far as I know the camera is going to have two mini XLRs. So I would assume that it will only have two channels of audio. It would be interesting if it was going to be 24bit/96kHz since I think that would be the highest bitrate of any camera. In fact, I believe that's as high as the Foxtex PD-6 and the like. But since it a 4K camera, why can't it have a nice high bitrate aduio.
 
4 channels indeed
 
at the moment indeed mini XLR
 
Josch: very true!
 
yes! (as can be seen from the renders / photos)
 
If you're going to need audio at that high resolution I think it makes more sense to do it double system with the proper gear (great preamps, isolation from other electronic equipment, etc...)
 
I agree to some extent. Having a sound guy is essential. If he is doing a backup recording to a Diva, PD-6 or something simular. But If the sound guy can feed signal back to the camera for recording with the footage, it makes post much simpler (faster). We'll just have to make sure that we have mini XLR to XLR adapters in our kit since I can't imagine a sound guy having them.

But if we treat this more like a traditional film camera, the audio never goes to the camera, it's all done in post. It all comes down to how we want to work the total workflow.
 
How about a compromise? Make it an upgrade OPTION for higher bit, I'd pay for it and Im sure many fellow RED shooters who don't have soundmen following them would too. Thanks.
 
It's really hard to get great audio circuits packed in with all those other circuits and get a really clean high SN ratio/dynamic range. That's my concern with the idea.
 
I think we're already getting 4 channels of 24bit 48Khz audio. In order to get any audible benefit from high bit depths/sample rates you do need top notch preamps and converters otherwise you don't gain anything other than a bloated data rate. If it happened, this would probably have to be an option due to economics. And it's not that higher resolution audio is directly more suceptible to interference, it's just that you need a really clean signal to benefit from it.

I think a multi channel digital audio in would be ideal, then it would be awesome to write that along with the video at up to 192Khz.
 
5th XLR

5th XLR

The fith mini-XLR connector is a 5 pin mini-XLR. This provides a two channel audio output which complements the 2 channel headphone output.
 
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