--- mpv 0.32.0 ---
- change behavior when using legacy option syntax with options that start
with two dashes (``--`` instead of a ``-``). Now, using the recommended
syntax is required for options starting with ``--``, which means an option
value must be strictly passed after a ``=``, instead of as separate
argument. For example, ``--log-file f.txt`` was previously accepted and
behaved like ``--log-file=f.txt``, but now causes an error. Use of legacy
syntax that is still supported now prints a deprecation warning.
https://github.com/mpv-player/mpv/blob/master/DOCS/interface-changes.rst
¯\(ツ)/¯