Media shortcodes must use wp_get_mime_types() with wp_check_filetype()

[nacin]

wp_check_filetype(), by default, uses a list of allowed mime types. This is severely restricted in multisite by default to exclude video file types.

wp_get_mime_types() should be passed as the list of mimes to use.

[nacin]

In 24944:

Use wp_get_mime_types() when calling wp_check_filetype() in the audio and video shortcodes. fixes #24911.

[nacin]

In 24945:

Use wp_get_mime_types() when calling wp_check_filetype() in the audio and video shortcodes. fixes #24911.

Merges [24911] to the 3.6 branch.