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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 :)

Desperate audio needs solution - FCP/Final Cut Pro

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raalphotography

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OK. We've recorded a couple of minutes on RED ONE Bld.16 (so happy to say that) The level in camera is decent on the meter and sounds great on the headphones (Sony MDR-7506) but when loaded into FCP v.6.0.4 via Log and Capture we see video and hear no audio above -43dB?!?! The wave doesn't even show up in the audio window. W then sent the clip to SoundTrack Pro and normalized it. It sounded perfect but after saving it, it wasn't updated in FCP and did not peak above -43dB. Does anyone know why our audio will not playback at a normal level? We could really use a suggestion. Day 1 is tomorrow. HELP!!!
 
You said Log and Capture, did you mean Log an Transfer? Transferring the R3D files into ProRes422?
If you have problems with that audio (it is not something I am familiar with) you can always take the audio from the camera reference files (proxies) open them up in QT player and export the audio as self contained 48K Qt files and import them into FCP and the begining of the file will match your same named converted file and the file should sound like you heard on the headphones in case there is a bug in the Log an Transfer.
 
Check whether the two channels of audio are in phase. They can cancel each other out. Just mute one channel in FCP if you have two.

Did I see 'audio polarity issues fixed' on a list of fixes in the latest build.
 
raalphotography said:
OK. We've recorded a couple of minutes on RED ONE Bld.16 (so happy to say that) The level in camera is decent on the meter and sounds great on the headphones (Sony MDR-7506) but when loaded into FCP v.6.0.4 via Log and Capture we see video and hear no audio above -43dB?!?! The wave doesn't even show up in the audio window. W then sent the clip to SoundTrack Pro and normalized it. It sounded perfect but after saving it, it wasn't updated in FCP and did not peak above -43dB. Does anyone know why our audio will not playback at a normal level? We could really use a suggestion. Day 1 is tomorrow. HELP!!!
Click to expand...

Do the proxy files play correctly? Because we are having the same issue, except that not even the proxies play at the right level. Everything meters correctly in the camera and sounds great in the headphone out both during recording and camera playback. But once we bring in the proxies, all the audio is almost inaudible. We've tested it on 3 different macs, in FCP, compressor, quicktime, etc. We even created new proxies in RA, but still no luck. We sent in a support ticket a few days ago and are still waiting to hear back.
 
Audio cables

Audio cables

Do the proxy files play correctly? Because we are having the same issue, except that not even the proxies play at the right level. Everything meters correctly in the camera and sounds great in the headphone out both during recording and camera playback. But once we bring in the proxies, all the audio is almost inaudible. We've tested it on 3 different macs, in FCP, compressor, quicktime, etc. We even created new proxies in RA, but still no luck. We sent in a support ticket a few days ago and are still waiting to hear back.
Click to expand...

We'll check that out again. It always has worked O.K, so something is up.

The Polarity issue was a double inversion happening in the digital domain, so it was transparent to you unless you also did an external audio recording. i.e that would not be a cause of this issue.
 
Thanks...

Thanks...

Jeremy Newmark said:
Everything meters correctly in the camera and sounds great in the headphone out both during recording and camera playback. But once we bring in the proxies, all the audio is almost inaudible.
Click to expand...

I just wanted to say thanks and express how glad I am that this forum exists. We had the same problem of everything being fine during the shoot but after L&T in FCP the audio is inaudible. We disabled one of the channels in FCP and and the audio was back to how we captured it.

Saved the shot! :biggrin:

Thanks everyone.
 
Jan Balster said:
We had the same problem of everything being fine during the shoot but after L&T in FCP the audio is inaudible. We disabled one of the channels in FCP and and the audio was back to how we captured it.
Click to expand...


That sure sounds like one of the two channels is phase reversed and is canceling the other out.
 
Has anyone tested doing this between L&T into ProRes versus L&T into R3D native (quicktime wrapped)?

So it sounds like editing in mono and doubling up into stereo for mix afterwards is the way to go....until a fix is found for this, that is.
 
Or phase reverse one of the channels - which one though!?
 
I had this same experience on a RED shoot last year. Sounded fine on the return, but when they imported into FinalCut the levels were so low as to be unusable. I told them that I thought maybe it was because they were playing back the files in the 16 bit realm. Is that a possibility?
 
No, low level is low level in every bit depth.
The advantage of 24 bit or 32float is that you can bring up almost inaudible recording levels back to sounding fine.
With 16 bit you end up with a maybe 8bit recording that is useless.

If on recoding the level looks good AND (!!!!) the recording sounds fine in the phones you are good.

If you have the mentioned phase problems you switch off one channel (->mono) or phase reverse one channel (doesnt matter which one) in any of the usual audio programms.

Jochen
 
Balanced cables?

Balanced cables?

It would seem hard to get that much cancellation from two mics, the phase error would make for more volume if the mics are more than a foot or so appart?

If the two hot pins on the mic connector are flipped in the camera or cable then you can get a 180 degree flip of the wave form, were you recording the same mic on two channels?

You can convert your multi track 24bit WAV files into mono wave files, then load those for mixing, if the mix sounds like a comb filter (head in a bucket effect) is on then you probably have a 180 degree flip in the phase.

You can make a cable to flip the phase if the inputs are balanced by swapping the hot pins on one end of the cable. But you need to know in advance what input needs to be flipped... If the inputs are not fully balanced 3 wire type, you may be able to flip with a 600 to 600 ohm audio transformer, you can wire a DPDT switch to give you in-phase and flip-phase on the secondary.
 
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