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Dolby 5.1 layback to HDCAM SR

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Mike Kahn
Dolby 5.1 layback to HDCAM SR
on Jul 7, 2009 at 3:49:58 pm

Tomorrow, I will be getting files from an audio house to do a Dolby 5.1 layback to an HDCAM SR that I already have the video in place. I have never done a 5.1 layback and don't know if there are any additional steps I need to follow in order to do this correctly.

I know that in FCP i can change my sequence settings for Audio Output to 5.1 and it gives me 6 channels. 1&2 are stereo, 3 is mono -3, 4 is off, 5&6 are stereo -3. These settings don't really seem correct.

I have done searches on the cow but have not found anything very recent about how to do this kind of layback. Any help would be great.

Thanks,
Mike


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Michael Sacci
Re: Dolby 5.1 layback to HDCAM SR
on Jul 7, 2009 at 4:40:07 pm

Generic help - You may want to search forums and google "Dobly E" encoding, that is what is use to send 5.1 to broadcasters, it is a 2-channel file. This maybe what you are getting.



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Mark Raudonis
Re: Dolby 5.1 layback to HDCAM SR
on Jul 7, 2009 at 4:41:26 pm

5.1 discreet channels are NO different than laying back any "regular" audio. If you're doing a
Dolby "E" encode... that's a whole different scenario.

To repeat: 5.1 is just assigning tracks and rolling tape. For Dolby "E" encoding I'd suggest you
use an expert if you've never done it before: Hint: The audio channels aren't even set to audio, they're set to "data".

Mark





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Mike Kahn
Re: Dolby 5.1 layback to HDCAM SR
on Jul 7, 2009 at 4:47:12 pm

Thanks guys, I am pretty sure that this is 5.1 and not Dolby E. We thought it was Dolby E last week and were all set to get decoders and sync boxes but after looking over the final specs, it is only 5.1.

So I will get, say, 6 channels of audio, place them in the sequence and lay off as if it was nothing more then 6 discreet channels of audio?


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Joey Burnham
Re: Dolby 5.1 layback to HDCAM SR
on Jul 7, 2009 at 6:23:29 pm

[Mike Kahn] "So I will get, say, 6 channels of audio, place them in the sequence and lay off as if it was nothing more then 6 discreet channels of audio?"

Yep. Check your delivery specs for the channel assignment. Usually these days it's:

Ch.1 L Ch.2 R Ch.3 C Ch.4 Sub Ch.5&6 LS/RS ch.7&8 LT/RT

But some clients like it different.
Also, you might need to change your sequence settings for more audio channels and well as your device control preset settings.

Best,
Joey



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Baz Leffler
Re: Dolby 5.1 layback to HDCAM SR
on Jul 8, 2009 at 12:23:46 am

...and HDCAM SR has 12 channels of audio so you can include MIX + M&E along with your 6 channels of 5.1.

What audio output device are you using Mike? (eg Kona, Blackmagic etc)

Baz

What would I do without the 'UNDO' button!!!!


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Mike Kahn
Re: Dolby 5.1 layback to HDCAM SR
on Jul 8, 2009 at 2:54:05 pm

Thanks for the help. I am using a Kona 3. Got the track layout from the deliverables and shouldn't have any problems.

Thanks again.

Mike



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Michael Sacci
Re: Dolby 5.1 layback to HDCAM SR
on Jul 7, 2009 at 4:50:11 pm

Add to the Dobly E warning, with that is being used those tracks NOT be monitors directly out to speakers. They can blow speakers quickly, it has to be run through a decoder to be monitored.

If they are 6 discreet channels you probably don't wait FCP going any levels adjustments on output. Audio people don't like video people messing with their audio. For fun I normally tell them, don't worry DVD players automatically down-mix the 5.1 to stereo and then watch them twitch.



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Michael Gissing
Re: Dolby 5.1 layback to HDCAM SR
on Jul 7, 2009 at 10:52:39 pm

[Michael Sacci] "For fun I normally tell them, don't worry DVD players automatically down-mix the 5.1 to stereo and then watch them twitch."

That's why I always supply a stereo LtRt mix for the DVD and broadcast stereo.


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