[Bug 52518] [quartz] Changes to playback speed show no effect

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52518

--- Comment #2 from Mershl <mweires at googlemail.com> ---
I've looked into why some Unity games are affected and some are not. The
default Unity Video Player uses Media Foundation. There's a popular alternative
video player for Unity called "AVPro Plugin" which has two selectable backends:
Media Foundation and DirectShow. To test it I setup 3 fresh Unity projects
which playback a video file with the option to adapt the playback rate.

Both Unity's and AVPro's Media Foundation implementation do not show the
playback rate issue on Wine. Only the AVPro + DirectShow backend does.

I've uploaded an minimal reproducer based on Unity 2020 (LTS) and AVPro 2.4.0
(with the DirectShow backend). Use arrow keys UP and DOWN to modify the
requested playback rate.
https://mega.nz/file/L85QgC4A#n2WAIEtJSc0-kY7dnVGb_0LG3HSoIoeGvpUn8jheOg4

The playback rate is working as expected on Windows 10. No playback rate
changes are seen on Wine 7.1 (tested using -GE's wine build).

Setting WINEDEBUG=warn+all shows the described log lines.

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