[New-bugs-announce] [issue38656] mimetypes for python 3.7.5 fails to detect matroska video

[toonn]

New submission from toonn <python at toonn.io>:

A user reported an error to us which seems to derive from the ``mimetypes`` library failing to guess the mime type for ``.mkv`` matroska video files:
https://github.com/ranger/ranger/issues/1744#issuecomment-548514373

This is a regression because the same query successfully identifies the filename as being of the ``video/x-mastroska`` mime type.

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components: Library (Lib)
messages: 355763
nosy: toonn
priority: normal
severity: normal
status: open
title: mimetypes for python 3.7.5 fails to detect matroska video
type: behavior
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38656>
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