Re: opening a quicktime file with AAC audio via AudioFileOpenURL
Re: opening a quicktime file with AAC audio via AudioFileOpenURL
- Subject: Re: opening a quicktime file with AAC audio via AudioFileOpenURL
- From: John Clayton <email@hidden>
- Date: Wed, 24 Sep 2008 06:05:03 +0200
Hi William,
No - not what I see. Core audio opens an .MP4 file that contains both
video and audio without a problem, i.e. AudioFileOpen() opens a
Quicktime movie OK.
It fails on a .MOV file though - which is really inconsistent. Well,
at least - it is from a 'user drags some quicktime file into my app
and expects my app to open it' point of view, because I'll have to
deal with the fact that Core Audio sometimes can't handle quicktime
files.
Oh yes, I should mention - I managed to modify the public utility
CAAudioFile class (that I'm using as part of my core-audio impl) - so
that it can be set up with either an AudioFileID or a Movie - either
will work, so this problem is solved for now (until something else
raises its ugly head). I used the Quicktime Audio Extraction API,
since its able to feed the buffer lists used in Core Audio directly.
Thanks
--
John Clayton
Skype: johncclayton
On 24/09/2008, at 3:46 AM, William Stewart wrote:
yes - core audio APIs do not open QT Movies, as they aren't "audio"
files (though they can contain audio data)
On Sep 19, 2008, at 6:25 AM, John Clayton wrote:
Hi All,
I get a 'dta?' error back from AudioFileOpenURL when I open an AAC
quicktime file - is this expected? I've had success with a .MP4
file that contains AAC encoded audio, but I get a failure when
opening a .MOV file with AAC encoded audio.
I don't understand why one would open ok and the other wouldn't -
anyone able to shed some light?
Thanks
--
John Clayton
Skype: johncclayton
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