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FCP X audio to 8 channel

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mike holifield
FCP X audio to 8 channel
on Nov 23, 2014 at 12:22:01 pm

I was given some specs for a documentary I did, and I'm not sure how to make them match. The specs say:

target rate of 145 Mbps
file essence:
video 1920 x 1080i
29.97 fps
4:2:2

Audio
8 channel stereo mix
24 bit
48 KHz
Drop frame timecode

What do I need to do to change the audio and Mbps?
Right now, it's stereo (2 channel), and I'm not sure the Mbps.


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Jeremy Garchow
Re: FCP X audio to 8 channel
on Nov 24, 2014 at 1:26:51 pm

What codec do they need? DNxHD 145? Regular Prores is right around 145Mb/sec.

For an 8 change output you'd need to assign Roles and export a multitrack QuickTime.

Do you know the channel assignments? I'm assuming a 5.1 + stereo?


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mike holifield
Re: FCP X audio to 8 channel
on Nov 24, 2014 at 3:10:44 pm

Here's what I was given.


The project right now is complete, except it's 2 channel stereo. It consists of interviews and narration, and audio/music tracks.

I'm not sure about "roles", is there a tutorial you know about?

The idea I had is take the narration and interview tracks, and make dual mono compound clips, and the audio/music channels also make compound clips..that gets me to 4 channels, but I'm not sure what to do about a center channel and the other channels. Would it be basically be copy the compound clips and assign them..making 4 narration tracks (and a center), and 3 audio/music...for a total of 8 "tracks"


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Jeremy Garchow
Re: FCP X audio to 8 channel
on Nov 24, 2014 at 3:52:42 pm

8 channel stereo seems odd, you may want to call and ask someone about it.

I would duplicate the stereo mix three times to give you 4 stereo outputs (8 channels) of audio.

Use regular ProRes, don't sorry about the bitrate.

From the stereo timeline, export a master file, choose proRes as the video format, and then choose "Roles as multitrack QuickTime". Then add three more audio outputs by rolling over the plus sign. Make sure the outputs are stereo, and all Roles are selected, and export. This will give you an 8 channel output with the stereo mix duped three times for a total of four.

I'd also ask for clarity as the specs aren't straight forward.

I'm not in front of a machine, or else I'd provide screen grabs.


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John Rofrano
Re: FCP X audio to 8 channel
on Nov 24, 2014 at 7:08:44 pm

As Jeremy said I would ask them about the 8 channels. It may only be there for people who have a 5.1 surround mix in addition to a stereo mix down. If all you have is stereo, I would just give them two channels so that it's obvious to them that your show is only available in stereo. You may cause more confusion by just sending them duplicate tracks that are not proper 5.1 (Front/Rear/Center/LFE) but ask them what they want. Also your slate should say whether you have 5.1 or only stereo. Did they ask for a slate, bars, & tone? That would be the place to specify things like that.

~jr

http://www.johnrofrano.com
http://www.vasst.com



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mike holifield
Re: FCP X audio to 8 channel
on Nov 25, 2014 at 3:04:17 am

unfortunately, this is all they have given me. no slate, bars, or tone. I've messaged them several times, and they say refer to the document.



I"m not sure why they insist on 8 channel either. I know they still broadcast regular stereo as well. I think they have just recently switched to receiving file based formats.


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Eric Sternberger
Re: FCP X audio to 8 channel
on Nov 25, 2014 at 9:35:55 am

That´s a typical Broadcast Spec from what i can see. I would guess it´s ok if you deliver your Stereo-Mix in a 8 Channel-Audio Track. You just setup roles that it delivers the stereo track + 6 muted channels extra.


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John Rofrano
Re: FCP X audio to 8 channel
on Nov 25, 2014 at 11:47:22 am

[Eric Sternberger] "You just setup roles that it delivers the stereo track + 6 muted channels extra."
That makes the most sense to me too. Leave the surround tracks empty instead of duplicating the stereo channels.

~jr

http://www.johnrofrano.com
http://www.vasst.com



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mike holifield
Re: FCP X audio to 8 channel
on Nov 25, 2014 at 3:02:59 pm

well, i didn't know if they would reject it with only 2 channels working, and the others empty.


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John Rofrano
Re: FCP X audio to 8 channel
on Nov 25, 2014 at 4:33:35 pm

[mike holifield] "well, i didn't know if they would reject it with only 2 channels working, and the others empty."
The problem is that they didn't say. The term "8 Channel Stereo Mix" is an oxymoron. Stereo is by definition 2 Channel so an "8 Channel Stereo Mix" is impossible. Unless they specifically tell you what they mean, I beleive it would be far better to give them 2 channels of stereo and 6 channels of silence so that there is no doubt in anyone's mind that there is no 5.1 Surround mix, rather than giving them 8 Channels of a copied stereo mix and having them reject the submission because your LFE channel wasn't set up properly (because it won't be!). It is quite common to leave channels empty when not in use. This avoids any misinterpretation of what they are. Alternate just send them a file with 2 channel stereo and see what they say.

You really need to contact them. The instructions said that you will be "assigned a liaison to help you with any questions" so ask to speak to your liaison. ;-)

~jr

http://www.johnrofrano.com
http://www.vasst.com



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