Re: trouble creating working Apple Lossless file under iOS 3.2
Re: trouble creating working Apple Lossless file under iOS 3.2
- Subject: Re: trouble creating working Apple Lossless file under iOS 3.2
- From: Christopher Penrose <email@hidden>
- Date: Fri, 5 Nov 2010 10:24:39 -0700
- Resent-date: Fri, 5 Nov 2010 10:36:35 -0700
- Resent-from: Christopher Penrose <email@hidden>
- Resent-message-id: <email@hidden>
- Resent-to: "email@hidden API" <email@hidden>
Thanks for the help. Before my first post I had tried using kAudioFileM4AType with a "m4a" file extension, and using kAudioFileCAFType with a "caf" file extension. Since reading your posts I tried using kAudioFileMPEG4Type for the transport and the ExtAudioFileCreateWithURL() call failed. So I took the advice that I thought would be least successful, simply change the file extension of a kAudioFileM4AType file I had made from "m4a" to "mp4", and, voila, the sound plays. However, shouldn't it work with an "m4a" extension? iTunes creates files with this extension and I thought it was explicitly associated with the kAudioFileM4AType (especially since "m4a" is in its title). The MacOS X finder also labels these playable audio files with an "mp4" extension as "movies". Is there something else I need to do to make a playable file with an "m4a" file extension?
Best, Christopher
---------------------------------------- Sent from my Antonov An-225
On Nov 5, 2010, at 1:10 AM, Aran Mulholland wrote: I had similar issues writing audio files as .aac, so i named the files as .mp4 and they worked fine (they now play from finder etc.), example project for writing output of an AUGraph to a file here - https://github.com/aranm/iPhone-ExtAudioFile-Record
On Fri, Nov 5, 2010 at 6:59 PM, Ian Esten <email@hidden> wrote:
ALAC data can be written to either CAF or Apple MPEG-4 audio formats. Perhaps if you switch to MPEG-4 you will get files that Quicktime and iTunes can play. I experienced the same problem with AAC data - Quicktime and iTunes would not play the files I created, but AFConvert could convert them back to PCM no problem.
Ian
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