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ac3 data rate problems

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stephan kay
ac3 data rate problems
on Nov 20, 2009 at 7:06:37 am

Hello all

I am using FCP7 and Compressor to export a ac3 file and an mpeg which I later mux with the help of MPEG Streamclip. The file will play back in a MV720p-HD player.

I am having problem with setting the datarate at 128kbps. The lowest preference setting in MPEG Streamclip seems to be 192 kbps.

Is there a way around this?

My Sequence is set to:
Audio: 48k, 24bit

My audio compressor settings are:
File Format: Dolby Digital Professional
Target System: Generic ac3
Audio Encoding Mode: 2 (L,R)
Sample Rate: 48k
Data Rate: 128 kbps

Any advice is much appreciated.

Thank you!

sk


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Michael Gissing
Re: ac3 data rate problems
on Nov 20, 2009 at 11:48:51 pm


What is the reason not to use 192? Dolby sounds very ordinary at low data rates so I would advise using mpeg VBR audio if you want a small file that sounds Ok.


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