Re: iPhone Library Access
Re: iPhone Library Access
- Subject: Re: iPhone Library Access
- From: Chris Adamson <email@hidden>
- Date: Mon, 19 Jul 2010 20:16:26 -0400
Thanks. My problem with exporting to a QuickTime movie (either directly or by adding the AVURLAsset as a track in a new composition) was that the audio got resampled to mono AAC. I tried passthrough, but not to a .mov -- I did public-mpeg4 and kept getting called back with an error after the export started. So if you've got passthrough working, that's a big win. Thanks.
-Chris
Sent from my iPad
On Jul 19, 2010, at 7:28 PM, Art Gillespie <email@hidden> wrote:
> Great post, Chris, thanks.
>
> After the back and forth on CDM a couple weeks ago, I posted an
> open-source class that uses passthrough for mp3, wav, aif, and m4a.
> Forgot to post it here on the list.
>
> In short, there's no need to transcode to m4a. (The trick is to use
> the passthrough preset with the quicktime mov output file type then
> grab the mdat atom out of the resulting .mov file)
>
> <http://blog.tapsquare.com/post/803301658/ipod-library-access>
>
> Of course, as I note in that post, anyone with access to the 4.1 beta
> may want to look carefully at the diffs before using
> AVAssetExportSession for this purpose.
>
> On Mon, Jul 19, 2010 at 10:40 AM, Chris Adamson <email@hidden> wrote:
>> I just posted a huge how-to blog about this, with downloadable code. I've been able to convert AAC, MP3, and ALAC from my iPod library into PCM, with the caveat that you have to use AV Foundation to export each song to an .m4a before you can open it as an Audio File (and the MP3 and ALAC conversions are lossy and expensive).
>>
>> <http://www.subfurther.com/blog/?p=1103>
>>
>> --Chris
>>
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