Re: Apple Lossless, iPods and bitrate in iTunes
Re: Apple Lossless, iPods and bitrate in iTunes
- Subject: Re: Apple Lossless, iPods and bitrate in iTunes
- From: Stephen Davis <email@hidden>
- Date: Thu, 19 Jan 2006 16:18:39 -0800
On Jan 19, 2006, at 3:49 PM, email@hidden wrote:
I have an application (http://sbooth.org/Max/) that can encode
files in
various Core Audio formats. I have run across strange issues that
I can't
quite figure out with the Apple Lossless codec. I use the
ExtAudioFile API for the encoding to make my life simpler. As far
as I
can tell everything is working correctly; the generated files open and
play in both iTunes and QuickTime Player. But, there seem to be two
issues with these files: some users are reporting that the files cause
their iPods to freeze three seconds into playback, and for some reason
iTunes does not detect the file's bitrate. (In the track list the
bitrate
shows up as "Unknown" and in the Info panel the bitrate doesn't
show up at
all. If I encode the same track with iTunes the bitrate shows up.)
My questions are these:
- I was under the impression that iTunes uses the Core Audio encoders
(which may be incorrect). If this is so, why the difference in files?
It does not.
- Why would the bitrate not show up in iTunes? I don't believe
this is
metadata. I also wonder if this could be related to the iPod crash.
Part of the magic cookie for the lossless codec is a field that
contains the average bit rate during encoding. The CoreAudio
implementation is not setting that field.
I doubt this is related to the iPod crash. Please file a bug report
about the iPod crash and attach an example file (http://
bugreporter.apple.com).
stephen
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