[Bug 56297] New: Othercide - video playback without a/v and hangs on loading screen

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56297

Bug ID: 56297
           Summary: Othercide - video playback without a/v and hangs on
                    loading screen
           Product: Wine
           Version: 9.1
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: mfplat
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 76014
  --> https://bugs.winehq.org/attachment.cgi?id=76014
Wine 9.1 log

Steps to reproduce: launch the game like wine64 Othercide.exe.

Expected result: the game should play intro video (publisher/developer logos),
then display splash screen with some more logos etc, then loading screen with a
little wheel turning in the corner and showing percents, and then the game
menu.

Actual result is black screen, no sound, no image, instead of intro, then (e.g.
on click) splash screen, correctly displayed, then loading screen, also
technically displayed correctly, but the little wheel shows 0% and keeps
turning forever. The game has to be killed by ctrl+c or wineserver -k.

Some other info:
a) Othercide is Unity game, in my case GOG version, Steam and console versions
also exist, so it is pretty multiplatform, but there is no Linux version. Real
shame.
b) Protom (8.05+ clone from git with what appears like 8-ish Wine inside) has
also broken video playback, but at least produces sound and does not hang, it
gets to the game menu and it is kinda playable.
c) Wine 9.1 and 8.1 behave the same, i.e. black screen instead of intro, then
eternal loading screen.
d) Wine 6.1 suprisingly DOES play intro and DOES NOT hang on loading screen,
the game appears to work. The reason I tried this particular version is that,
while searching for fix, I found a number of similar bugs reported here and at
Proton's website (but not pertaining to Othercide), mostly revolving around
mfplat.dll or Media Foundation, a somewhere, but I do not recall where, was a
link to wine mailing list, where somebody patched something related to that in
february 2021, if you allow me to be so vague :D So I tried Wine from January.
Maybe I got the whole issue wrong and mfplat is not to blame, but 6.1 does
work, that much is sure.
e) Intro video appears to be ineed H264 file in
Othercide/Othercide_Data/StreamingAssets/videos/SplashFocusLBC_New.m4v