[Bug 56976] New: Diggles The Myth of Fenris v2.1.1.10: intro video doesn't work

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56976

Bug ID: 56976
           Summary: Diggles The Myth of Fenris v2.1.1.10: intro video
                    doesn't work
           Product: Wine
           Version: 9.13
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: P2
         Component: winegstreamer
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
   Regression SHA1: 2a0a43627b9bf3d2073e06322d651a827af64cc7
      Distribution: ArchLinux

Created attachment 76803
  --> https://bugs.winehq.org/attachment.cgi?id=76803
plain terminal output, gst-discoverer output

This bug report is about the 2020 remake/re-release of the game
Diggles/Wiggles. The game is available on Steam and GOG. I tested with the
GOG.com version (v2.1.1.10).

Description: the video file startup.mov should be played on game start but the
video doesn't work: only black screen is shown and there is no audio either.
Pressing <Esc> is skipping the unplayable video and the game loads the main
menu.

gst-play opens and plays the video properly.

Reverting commit
commit 2a0a43627b9bf3d2073e06322d651a827af64cc7
(winegstreamer: Implement MPEG-4 audio to wg_format conversion.)
fixes the problem and the intro video works properly.

As far as I know there is no demo version available.

Please let me know if you need debug logs.