Properties of ALAC in mp4

Lukáš Lalinský lalinsky at
Wed Jun 8 19:02:27 CEST 2011

On Wed, Jun 8, 2011 at 6:45 PM, Frank Lai <frank.franklai at> wrote:
> Hi all,
> The attached patch is for read properties from "alac" atom when the audio
> codec in mp4 is ALAC.

Hi Frank,

Thanks for the patch. It seems to work fine, except for bitrates. What
is the source that you used for the format info? I've encoded a small
file consisting only of silence and all applications report it to have
3 kbps. Your code reports 1411 kpbs, which is what I get when I
convert it to a wav file. Is it possible that it's the bitrate of the
uncompressed audio data?


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