[wp-trac] [WordPress Trac] #39550: Some Non-image files fail to upload after 4.7.1

[WordPress Trac]

#39550: Some Non-image files fail to upload after 4.7.1
---------------------------+------------------------
 Reporter:  greatislander  |       Owner:  joemcgill
     Type:  defect (bug)   |      Status:  assigned
 Priority:  normal         |   Milestone:  4.7.2
Component:  Upload         |     Version:  trunk
 Severity:  normal         |  Resolution:
 Keywords:  needs-patch    |     Focuses:
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Comment (by kosso):

 4.7.1 immediately broke .m4a audio file uploads.

 `wp-includes/functions.php` incorrectly assigns it as `audio/mpeg'

 According to rfc4337 it should be set to `audio\mp4`

 Changing it to this fixed m4a uploads for me.

 - Note: Many places have different ideas about what the correct MIME type
 for 'Apple MPEG-4 audio' should be. Observed are :

 audio/mp4
 audio/m4a
 audio/x-m4a
 audio/mp4a-latm [Low-overhead MPEG-4 Audio
    Transport Multiplex]

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Ticket URL: <https://core.trac.wordpress.org/ticket/39550#comment:47>
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