https://bugs.winehq.org/show_bug.cgi?id=55596
--- Comment #9 from Nikolay Sivov bunglehead@gmail.com --- (In reply to Rufusovis from comment #0)
Patching Wine with this patch makes video playback's audio work correctly. I couldn't find anything related to IMFMediaSource, unfortunately.
You said it helped when you tested, at some point. How did you do that originally?