# macOS and MP4(.m4a) audio

**URL:** <https://qa.fmod.com/t/macos-and-mp4-m4a-audio/13279>\
**Category:** FMOD Engine\
**Created:** [July 10, 2017, 9:20am UTC](https://qa.fmod.com/t/macos-and-mp4-m4a-audio/13279 "2017-07-10T09:20:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![klymenko.volodymyr.m](https://avatars.discourse-cdn.com/v4/letter/k/82dd89/32.png) [@klymenko.volodymyr.m](https://qa.fmod.com/u/klymenko.volodymyr.m)\
**Post date:** [July 10, 2017, 9:20am UTC](https://qa.fmod.com/t/macos-and-mp4-m4a-audio/13279/1 "2017-07-10T09:20:20Z")

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FMOD error 19 - Unsupported file or audio format.  
It works fine on iOS, didn’t tested on android yes, but I think it will work.  
However I got this error when trying to play same file on macOS. When I change format to .mp3 all works well, but I want to use MP4.

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**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\
**Post date:** [July 11, 2017, 5:35am UTC](https://qa.fmod.com/t/macos-and-mp4-m4a-audio/13279/2 "2017-07-11T05:35:20Z")

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MP4 AAC can only be decoded on the iOS platform for FMOD 4 (FMOD Ex / FMOD Designer).  
With FMOD 5 (FMOD Studio) you can play MP4 AAC on iOS and Android.

Due to licensing issues we only support AAC decoding on those platforms.

If you need AAC decoding on other platforms you would need to implement this yourself via a custom FMOD codec plugin.

Taken from: [https://www.fmod.org/questions/question/mp4-support/](https://www.fmod.org/questions/question/mp4-support/)

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<div class="post-metadata">

**Author:** ![klymenko.volodymyr.m](https://avatars.discourse-cdn.com/v4/letter/k/82dd89/32.png) [@klymenko.volodymyr.m](https://qa.fmod.com/u/klymenko.volodymyr.m)\
**Post date:** [July 11, 2017, 8:36pm UTC](https://qa.fmod.com/t/macos-and-mp4-m4a-audio/13279/3 "2017-07-11T20:36:42Z")

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> [@](#):
>
> MP4 AAC can only be decoded on the iOS platform for FMOD 4 (FMOD Ex / FMOD Designer).  
> With FMOD 5 (FMOD Studio) you can play MP4 AAC on iOS and Android.
> 
> Due to licensing issues we only support AAC decoding on those platforms.
> 
> If you need AAC decoding on other platforms you would need to implement this yourself via a custom FMOD codec plugin.
> 
> Taken from: [https://www.fmod.org/questions/question/mp4-support/](https://www.fmod.org/questions/question/mp4-support/)

So, that means for me I can’t use it on Mac? But just macOS plays that file without any problem.