No sound with ao=pipewire

[Gigas002]

I suppose it's some pipewire regression, but it doesn't happen to me in any other application.
Forcing ao=alsa fixes the issue, but I'd like to fix or at least know the exact cause of this

❯ mpv --version
mpv v0.40.0-dirty Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Oct  5 2025 03:36:47
libplacebo version: v7.351.0
FFmpeg version: n8.0
FFmpeg library versions:
   libavcodec      62.11.100
   libavdevice     62.1.100
   libavfilter     11.4.100
   libavformat     62.3.100
   libavutil       60.8.100
   libswresample   6.1.100
   libswscale      9.1.100

❯ pipewire --version
/usr/bin/pipewire
Compiled with libpipewire 1.4.9
Linked with libpipewire 1.4.9

❯ wireplumber --version
/usr/bin/wireplumber
Compiled with libwireplumber 0.5.12
Linked with libwireplumber 0.5.12

I also tried running the master version of mpv but the behavior is still the same.

For the record, I'm on CachyOS, so this theoretically may be a packaging issue (?)

[Gigas002]

[   0.044][v][af] [in] 48000Hz stereo 2ch floatp
[   0.044][v][af] [userspeed] 48000Hz stereo 2ch floatp
[   0.044][v][af] [userspeed] (disabled)
[   0.044][v][af] [convert] 48000Hz stereo 2ch floatp
[   0.044][v][ao] Trying audio driver 'pipewire'
[   0.044][v][ao/pipewire] requested format: 48000 Hz, stereo channels, floatp
[   0.044][v][ao/pipewire] Headers version: 1.4.8
[   0.044][v][ao/pipewire] Library version: 1.4.9
[   0.045][v][ao/pipewire] Core user: gigas
[   0.045][v][ao/pipewire] Core host: gigas-pc
[   0.045][v][ao/pipewire] Core version: 1.4.9
[   0.045][v][ao/pipewire] Core name: pipewire-0
[   0.045][d][ao/pipewire] Stream state changed: old_state=unconnected state=connecting error=(null)
[   0.045][v][ao/pipewire] using soft-buffer of 9600 samples.
[   0.045][i][cplayer] AO: [pipewire] 48000Hz stereo 2ch floatp
[   0.045][v][cplayer] AO: Description: PipeWire audio output
[   0.045][v][af] [convert] (disabled)
[   0.045][v][af] [out] 48000Hz stereo 2ch floatp
[   0.046][d][ao/pipewire] Stream state changed: old_state=connecting state=paused error=(null)

full log: output.txt

[Gigas002]

This looks related: #16459

[Gigas002]

Resolved there