AAC bit rate
AAC bit rate
- Subject: AAC bit rate
- From: Casey Fleser <email@hidden>
- Date: Thu, 29 Apr 2004 11:15:54 -0500
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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