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Re: mixing audio channels

Title: Re: mixing audio channels
Hi Mark,

Sadly, in that case I’m not the best person to help – my expertise is more around playback of multichannel movies, rather than channel format changes during movie export – but I’ve posted your email back to the list, as I’m sure someone else can tell you how to do this with the QuickTime API based on this extra info.

Actually, here’s a thought – if you just need to do this for one movie right now, and the movie has one soundtrack with four channels in it, then you could try this in QuickTime Player (Pro):

Open the movie, and select Show Movie Properties.  Your soundtrack should be listed in here as one of the tracks.  Disable all tracks bar the soundtrack.  Then, select the soundtrack, and choose the Audio Settings tab in the bottom half of the Properties window.  If the soundtrack has four channels, you should see all four listed in the bottom right hand part of the properties window.

Start by assigning Channel 1 to Left, and Channel 2 to Right.  Assign channels 3 and 4 to Unused.  Then, export the movie using the “Sound to AIFF” settings, making sure that under the Options, the Channels are set to “Stereo (L R)”.

One the sound has exported, go back to Properties and set channels 1 and 2 to Unused, Channel 3 to Left, and Channel 4 to Right.  Export this as a separate AIFF in the same way.  Hopefully, this should get you two stereo AIFFs, which you can then import into Avid!

I don’t have a movie with a 4-channel soundtrack here, so haven’t been able to test this, but it should work...

All the best,

Dave.


From: no spam <email@hidden>
Date: Thu, 29 Jun 2006 07:36:30 -0400
To: Dave Addey <email@hidden>
Subject: Re: mixing audio channels

Yes you can tell I don't know a great deal about this :-)

We're trying to import a clip into our Avid system from a  Pinnacle system.  The Pinnacle system is a DV25 AVI video with 4 channels of audio.  The Avid system will only recognize two of the 4 audio clips when they are quicktime wrapped.  So yes I need to convert the 4 channel audio clip into 2 two-channel stereo tracks.

Thanks,
Mark

On 6/29/06, Dave Addey <email@hidden> wrote:
Hi Mark,

In a way, 4 channels of audio already are two stereo pairs, depending on what you plug them into... Can you give a bit more information about what you're trying to do?  E.g. Do you have a four-channel audio track, which you need to convert to two two-channel (stereo) tracks?  Or something else?  Are you looking to convert a movie from one format to another in non-realtime, or to output a 4-channel track to two separate stereo output devices as it plays?

QuickTime 7 supports multichannel audio across the board, for export and playback, so it should be possible to achieve what you need, once we know what it is :-)

Dave.

From: no spam <email@hidden>
Date: Wed, 28 Jun 2006 13:52:21 -0400
To: <email@hidden>
Subject: mixing audio channels

I came across this message in the archives and would like to know how to mix 4 channels of audio down to 2 stereo pairs via quicktime.

I'm also working with Avid.
Cheers,
Mark
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Folks - a colleague at work has stumped me. The current rev - 6.5 Pro - supports 2 channels of audio, correct? Or is it more?

 
And QuickTime 7 will support how many?

We have clients that mix on Avid and FCP systems that can work in 6-8 channels.

Forgive the naive question.

Many thanks.


Scott

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