[Bug 81122] Some media files are not recognised as such (ogm, mkv, mka)

[Phil Housley]

Public bug reported:

Binary package hint: shared-mime-info

Certain types of media files are not recognised as being media in
nautilus; as can be seen when thumbnailing fails and you just get a
blank-page icon.  Some I've noticed:

Matroska audio, with .mka extension
Matroska video, with .mkv extension
Ogg with video, with .ogm extension

(These are also not covered by ls' coloring scheme, should that be a
separate bug, or is it based on the general mime info?)

** Affects: shared-mime-info (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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Some media files are not recognised as such (ogm, mkv, mka)
https://launchpad.net/bugs/81122