[Bug 50733] New: MUSICUS!: ending videos play are extremely choppy

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50733

            Bug ID: 50733
           Summary: MUSICUS!: ending videos play are extremely choppy
           Product: Wine
           Version: 6.3
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winegstreamer
          Assignee: wine-bugs at winehq.org
          Reporter: pernegger at gmail.com
      Distribution: ---

When testing if 6.3 fixed #50686 I noticed another performance issue /
regression: MUSICUS!'s MPEG1 ending videos are extremely choppy in 6.3. They're
not very dynamic in the first place, so it's hard to tell what's wrong, but the
audio (ending song) is fine, and the video (lyrics) are more or less in sync,
so I'd say lots of frames are getting dropped, but I couldn't swear the whole
thing isn't running a tad slow, too.

6.0 is *much* better. If I open the video in VLC directly, it is a bit smoother
still, but without a direct comparison I wouldn't have noticed. This is on a
Ryzen 7 3900X [Ubuntu 18.04.5].

(Then I remembered that I had this issue on my "laptop", too. That's a Surface
Go 2 [Ubuntu 20.04], currently. Only it was *much* worse, totally unwatchable,
we're talking a new frame every other second, maybe. I chalked it up to the
machine being too slow, but maybe not.
It's not just MUSICUS!, either, I retrospect one or two other (older) visual
novels showed similar symptoms -- I just assumed the videos were crap at the
time.
Note that this bug is strictly about MUSICUS!, when that test case is fixed,
I'll happily go back and test the other stuff, the tangent is just meant to
illustrate that hardware performance may play a role in how noticeable it is.)

[#50239 has slightly different symptoms, and most importantly, I'm using
MUSICUS!'s 64-bit exe.]

The regular terminal output has nothing, please advise on how to get suitable
debug logs.

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