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See #1134762: Add mappings for mkv and webm as video files.
From http://en.wikipedia.org/wiki/Matroska
mkv = video/x-matroska
mka = audio/x-matroska
Comments
Comment #1
Dave ReidComment #2
Dave ReidMerging this issue into #1443070: Add support for popular e-book formats, Google web formats, mkv and mka in file_default_mimetype_mapping()
Comment #2.0
Dave ReidUpdated issue summary.
Comment #3
Gábor HojtsySwap to the right media tag.