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Stereo Audio Setting for Pro-Res 422 HQ encode? Have Mono and Discrete, neither seems right.

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Nina Lucia
Stereo Audio Setting for Pro-Res 422 HQ encode? Have Mono and Discrete, neither seems right.
on Jul 4, 2020 at 9:21:11 am
Last Edited By Nina Lucia on Jul 5, 2020 at 12:04:12 am

Hi all.

So I usually just encode viewing copies of things I'm working on, but I now have the final elements of a short film and want to create a Pro-Res 422 HQ QT with stereo sound.

I am using an Avid Same as Source export that I made from AMA linking to the ProRes picture QT. It exports as DNxHD even though it is using AMA link to a ProRes QT.
(I didn't try exporting in Avid as ProRes yet as I have had issues in the past doing that with it taking a really long time. And I mean REALLY long time, to where I wasn't sure if it was actually doing anything at all. Now that was for feature length film so perhaps it will be fine for this short. I'm about to try that.)

For my viewing transcodes I use h.264 and the audio settings give me the option of stereo under the Basic Audio section. In my Pro-Res setting, that option is not there, but there is another section with the option to choose Mono or Discrete. I did both and the Mono ends up saying "mono mono" in the QT info panel, which it should say "stereo", and the Discrete has no audio playing at all, even though the setting said it had channels 1-2.



So, how do I just get normal stereo tracks using the ProRes setting? Perhaps I haven't set up the ProRes part correctly? My preset is Custom as there was no ProRes showing up there as I thought it would, so I found ProRes under the Video > Video Codec setting.


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Tim Wilson
Re: Stereo Audio Setting for Pro-Res 422 HQ encode? Have Mono and Discrete, neither seems right.
on Jul 13, 2020 at 2:01:28 pm

Hi Nina,

I found a post in the COW archive that might help. It was originally posted by Michael Lewis in 2014 here, but I think it's still applicable.

He wrote:

You need to make a new sequence multi-channel settings. You cannot change a sequence to multichannel once there is any media in it.

1. Make new sequence
2. Set video settings.
3. Go to "Tracks" tab
4. Set "Master" to "Multi-channel" with number of channels at 5
5. Make all the channels Mono because unlike FCP, premiere will not give you a quicktime where the audio channels can contain both mono, and paired and panned stereo tracks. You'll have to just export 5 mono tracks where your layout is something like this:

ch1. mono COMMS
ch2. FX L (will not come out panned in the quicktime, but will contain all the left audio)
ch3. FX R
ch4. soundtrack L
ch5. soundtrack R

your sequece settings should look something like this


note: Make sure you have the audio panned as seen in the image. This will become more clear later when you are definine output channels.

6. If you haven't already exported your audio stems, go ahead and do that. You can solo the tracks you have designated to fx and export them to a stereo AIFF, then do the same for your soundtrack tracks. For your COMMS track, go ahead and export it to an mono AIFF.
7. Import your stems and interpret them all as mono by right clicking them in the project panel Modify>audio channels> preset> mono
6. Drop the stems into the appropriate tracks.
7. Open the audio track mixer window (not to be confused with the audio clip mixer)
8. You need the click the buttons where it says (1+2), so that the track destinations look like the image below. Notice how you can only select 1+2 and not just channel 1--this is why you are panning the tracks. Panning them Left will make them go to the odd track and panning them right will go to the even track.

Your final layout should look like this


9. Export your sequence. Under the audio tab, in "basic audio settings" change the number of thannels 5. If you do not have this option, make sure your video wrapper supports multi-channel audio. For example, quicktime will support multi channel audio and most likely the video compression that you need.

+++

Okay, so that's Michael's advice from a few years back. Any contemporary audio whizzes have anything to add?

Thanks,
Tim


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