OpenAL file formats

I've read a few posts on this but haven't found any definitive answers, hoping someone might be able to help. I'm using OpenAL in my app and am converting my sound effects to the correct format.
If I convert my file like this:
/usr/bin/afconvert -f caff -d LEI16 -c 1 bs3.mp3 bs3.caf
the file works fine. If I convert it like this:
/usr/bin/afconvert -f caff -d ima4 -c 1 bs3.mp3 bs3.caf
it doesn't work at all. I'd like to use the ima4 compression as the files are huge without this. Has anyone had any luck getting ima4 to work?
Thanks in advance
Mike

I think you should be using :
/usr/bin/afconvert -f caff -d 'ima4' -c 1 bs3.mp3 bs3.caf
i.e. you should type 'ima4' instead of ima4 (including the single quotes).

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