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3GPs from Apple Compressor

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uncle sid
3GPs from Apple Compressor
on Oct 3, 2007 at 3:48:21 pm

Were trying tp convert DV clips to 3GPs using Apple Commpressor.
The problem is we're unable to set the bit rate to constant (CBR)and our client requires this. Would anyone be able to solve this or suggest some alternative software.

Big thanks for any advice on this one..


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Ed Dooley
Re: 3GPs from Apple Compressor
on Oct 3, 2007 at 6:04:03 pm

In Compressor 2 anyway, the bit rate appears to me as constant. Under 3GPP GPRS, for example, when you select options under the 3G encoding tab, the default is a constant 25kbs.
Ed


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uncle sid
Re: 3GPs from Apple Compressor
on Oct 4, 2007 at 12:38:33 pm

That's what we thought... in that when you set the Data Rate, that should be a CBR as you've no option to select VBR or CBR. However, when a client of our looks at the 'shape' or profile of the files we supply, he says the data rate is peaking at over 128kbps (we set the rate at 80kbps) and he needs it to stay betweem 80-90kbps.

ANY help appreciated! Thanks.


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Ed Dooley
Re: 3GPs from Apple Compressor
on Oct 4, 2007 at 3:50:28 pm

You set the combined video *and* audio rate at 80, or just the video rate?
What's the audio set at? All I can think of is that you have a high audio rate
that's raising the total, or perhaps the rate he's seeing is incorrect. That used to
be a common problem with WMVs, you'd set the rate, but it would read differently,
*and* there was also an "overhead" hit which increased the rate.
Ed


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