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Editorial Team
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Asked: 2026-05-20T18:56:52+00:00

I’m grabbing song data from the iOS music library (as an NSData object), but

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I’m grabbing song data from the iOS music library (as an NSData object), but when the data is not that of an MP3 file, I’d like to transcode it.

I have two questions about the transcoding process:

  1. Is there something built in to do, say M4A to MP3 transcoding, or will I have to use something like ffmpeg or other external libraries? If the latter, are there any examples of doing this on iOS knocking about?

  2. What’s the best way to do this that doesn’t load everything into memory? Obviously a large song file will exhaust the memory and the app will be terminated.

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1 Answer

  1. Editorial Team

    maybe libSOX fits to your needs.

    the features of the tool are available [here][2]

    to compile for iOS, check out the thread building libsox for iOS question

    [2]: http://sox.sourceforge.net/Docs/Features “here”

    i think ffmpeg is the choice

    for iOS http://code.google.com/p/ffmpeg4iphone/

    http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-October/076618.html

    http://fobs.sourceforge.net/ is another choice (C++ wrapper to FFMPEG). Its home page has a reference to m4a files. To use it you could wrap up C++ in Objective-C in a .mm file.

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