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: William Stewart <email@hidden>
- Date: Wed, 24 Sep 2008 13:58:12 -0700
On Sep 23, 2008, at 9:05 PM, John Clayton wrote:
Hi William,
No - not what I see. Core audio opens an .MP4 file that contains
both video and audio without a problem,
yes, it will do that
i.e. AudioFileOpen() opens a Quicktime movie OK.
no, it will not open a .mov file - an MPEG-4 file is not a QT Movie
file.
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.
ok, but if you want to handle QT files, then you have QT APIs to do
that.
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.
not really. you only think this is solved because you think that a
movie and an MPEG file are the same thing. They aren't.
Bill
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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