Re: AAC bit rate
Re: AAC bit rate
- Subject: Re: AAC bit rate
- From: William Stewart <email@hidden>
- Date: Thu, 29 Apr 2004 17:00:45 -0700
Check the afconvert code - it has an option when generating AAC to
provide an option to set the bit rate (its in the new SDK in the new
AudioFile Tools)
Bill
On 29/04/2004, at 9:15 AM, Casey Fleser wrote:
>
I've set up an audio converter which converts from stereo 16 bit PCM
>
(kAudioFormatLinearPCM) to AAC (kAudioFormatMPEG4AAC) and I'd like to
>
change the encoder bit rate from 128 kbps to something else via
>
AudioConverterSetProperty/kAudioConverterEncodeBitRate. However, this
>
fails and AudioConverterGetPropertyInfo reveals that this property
>
isn't writable. Is this for any AAC encoder or just this particular
>
configuration? Is there another method of setting this property?
>
>
A little side note:
>
AudioConverterGetPropertyInfo/kAudioConverterAvailableEncodeBitRates
>
yields the following:
>
>
2004-04-29 10:59:34.604 xxx rate 0 min 64000.000000 max 64000.000000
>
2004-04-29 10:59:34.619 xxx rate 1 min 80000.000000 max 80000.000000
>
2004-04-29 10:59:34.633 xxx rate 2 min 96000.000000 max 96000.000000
>
2004-04-29 10:59:34.647 xxx rate 3 min 112000.000000 max 112000.000000
>
2004-04-29 10:59:34.661 xxx rate 4 min 128000.000000 max 128000.000000
>
2004-04-29 10:59:34.677 xxx rate 5 min 160000.000000 max 160000.000000
>
2004-04-29 10:59:34.693 xxx rate 6 min 192000.000000 max 192000.000000
>
2004-04-29 10:59:34.709 xxx rate 7 min 224000.000000 max 224000.000000
>
2004-04-29 10:59:34.723 xxx rate 8 min 256000.000000 max 256000.000000
>
2004-04-29 10:59:34.738 xxx rate 9 min 320000.000000 max 320000.000000
>
>
TIA,
>
>
Casey
>
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