Re: problems using afconvert to do alac to aac
Re: problems using afconvert to do alac to aac
- Subject: Re: problems using afconvert to do alac to aac
- From: Andrew Barnert <email@hidden>
- Date: Sun, 1 Jul 2007 22:38:24 -0700
My guess is that the sample is putting together some collection of
conversion parameters that isn't valid for CAAudioFileConverter. The
exact problem may not be documented, but it probably won't be too
hard to guess or figure out once you know what params you're passing.
So, just get afconvert.cpp to dump all of the members of its params
right before calling mAFConverter->ConvertFile(params) and play with
changing the settings right there (or breakpoint it in the debugger).
It's also possible there's an even simpler, less-audio-related bug in
the sample code (which is, after all, sample code that probably three
people outside of Apple have tried to use...). Maybe the
ParseStreamDescription code doesn't handle 4ccs with spaces properly,
or something else equally silly.
On 1 Jul 2007, at 22:06, the deep wrote:
hi, first time caller. I've googled through the archives but haven't
found anything that'll help with this little problem I'm having.
I'm trying to use afconvert to go from an alac encoded m4a to one
encoded with aac (I'm hoping to use this in a set of scripts which
will generate a compressed music library from uncompressed).
I'm getting an Error: SetNumberFrames only supported for PCM (-66566)
running 10.4.8, I get this:
% afconvert -v -f adts -d "aac " tmm_alac.m4a tmm_aacTest.m4a
Input file: tmm_alac.m4a, 14655488 frames
Formats:
Input file 2 ch, 44100 Hz, 'alac' (0x00000001) from 16-bit
source, 4096 frames/packet
Output file 2 ch, 44100 Hz, 'aac ' (0x00000002) 0 bits/channel,
0 bytes/packet, 1024 frames/packet, 0 bytes/frame
Stereo
Input client 2 ch, 44100 Hz, 'lpcm' (0x0000000B) 32-bit big-
endian float
AudioConverter 0x1814e74 [0x3196e0]:
CodecConverter 0x319b40
Input: 2 ch, 44100 Hz, 'alac' (0x00000001) from 16-bit source,
4096 frames/packet
Output: 2 ch, 44100 Hz, 'lpcm' (0x0000000E) 16-bit big-endian
signed integer
PCMConverter 0x319a10
Input: 2 ch, 44100 Hz, 'lpcm' (0x0000000E) 16-bit big-endian
signed integer
Output: 2 ch, 44100 Hz, 'lpcm' (0x0000000B) 32-bit big-endian
float
Output client 2 ch, 44100 Hz, 'lpcm' (0x0000000B) 32-bit big-
endian float
AudioConverter 0x1814e7c [0x319d40]:
CodecConverter 0x31a010
Input: 2 ch, 44100 Hz, 'lpcm' (0x0000000B) 32-bit big-endian
float
Output: 2 ch, 44100 Hz, 'aac ' (0x00000002) 0 bits/channel, 0
bytes/packet, 1024 frames/packet, 0 bytes/frame
error -66566: SetNumberFrames only supported for PCM
Error: SetNumberFrames only supported for PCM (-66566)
similarly when using -f m4af instead of -f adts.
I started off trying to write my own app using coreaudio, then noticed
afconvert while reading the docs---am I just calling it incorrectly?
thanks!
deep
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