elementary OS won't play videos because sound system/pulseaudio hangs

### What Happened?

I don't really know where to put this issue, so I'm trying it here.

elementary OS won't play any mp4 videos, neither using Web nor Firefox nor Movies app. Behavior always is the same: It shows a still picture out of the movie, but it won't play.

I think I installed all required codecs because I literally installed everything I could find out there on the web.

I'm wondering if this has to do with the state of the Intel i915 GPU driver and Vulkan/Wayland? Interestingly it won't work using X11 as well. I once managed to play movies in low quality (and without sound) after first logging in using the X11 session and then trying Wayland. Don't know what happened there.

Found these issues out there: https://bbs.archlinux.org/viewtopic.php?id=299546 - https://discussion.fedoraproject.org/t/latest-gnome-apps-not-working-in-fedora-41-using-wayland/134807/4

Output seems to be similar to what Web is logging when trying to play a YouTube movie:
```
2024-12-17T22:58:27.325099+01:00 XinkPad280 org.gnome.Epiphany.desktop[8741]: MESA-INTEL: warning: ../src/intel/vulkan/anv_formats.c:782: FINISHME: support YUV colorspace with DRM format modifiers
2024-12-17T22:58:27.325483+01:00 XinkPad280 org.gnome.Epiphany.desktop[8741]: MESA-INTEL: warning: ../src/intel/vulkan/anv_formats.c:814: FINISHME: support more multi-planar formats with DRM modifiers

2024-12-17T22:58:57.571735+01:00 XinkPad280 kernel: i915 0000:00:02.0: Using 39-bit DMA addresses
```

Don't know if it's an GTK/Vulkan issue only? Booted Xubuntu using the same machine. That plays videos nicely.

### Steps to Reproduce

See above.

### Expected Behavior

Videos should be played.

### OS Version

8.x (Circe)

### Session Type

Secure Session (Wayland)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

ThinkPad X280, Intel Graphics, i915 driver