> From: David Duncan <email@hidden>
> Subject: Re: Using the Audio Extraction API in QuickTime 7
> To: Andy Robinson <email@hidden>
> Cc: email@hidden
> Message-ID: <email@hidden>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
>
> On Dec 23, 2005, at 04:59 AM, Andy Robinson wrote:
>
> > I've just been reading "Using the Audio Extraction API in QuickTime
> 7"
> > http://developer.apple.com/quicktime/audioextraction.html
> >
> > Can this be used to read sample data from mp4 files? (where you
> > have the
> > appropriate license of course).
>
> You should be able to extract audio from most if not all unprotected
> files that have audio (I'm not certain about muxed MPEG). Protected
> audio files however will only produce silence. And you shouldn't
> need
> a license to extract audio, only to encode it.
Oops - I really meant m4p, the Apple Music Store files. But from what
you say, it won't work. The page I mentioned on the Apple site discusses
the perfectly good reasons why a person might want to do this, and the
user has paid for their music, but Apple don't allow them proper access
to it. It's really very poor (as others have commented too).
Regards,
Andy Robinson, Seventh String Software, www.seventhstring.com
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