SyncPlay crashes on launch when using mpv

[AmetistoFF]

Describe the bug
When using mpv as a player, syncplay crashes on launch. Here's console log:

qt.multimedia.symbolsresolver: Couldn't load pipewire-0.3 library
qt.multimedia.symbolsresolver: Couldn't resolve pipewire-0.3 symbols
[02:55:33] Not playing current index - Index none or length issue
[02:55:33] Failed to find index None in playlist
[02:55:33] This version of mpv is not known to be compatible with changing the OSC visibility. Please use mpv >=0.28.0.
[02:55:33] Could not send quit message: 'MpvPlayer' object has no attribute '_listener'
[02:55:33] client/server >> {"TLS": {"startTLS": "send"}}
[02:55:33] client/server << {"TLS": {"startTLS": "false"}}
[02:55:33] client/server >> {"Hello": {"username": "user", "room": {"name": "11"}, "version": "1.2.255", "realversion": "1.7.5", "features": {"sharedPlaylists": true, "chat": true, "uiMode": "GUI", "featureList": true, "readiness": true, "managedRooms": true, "persistentRooms": true, "setOthersReadiness": true}}}

To Reproduce
Steps to reproduce the behavior:

1. Launch syncplay with mpv player
2. See error

Expected behavior
Syncplay launches

Version and platform:

• OS: SteamOS 3.8.14
• Syncplay version and build type: SyncPlay 1.7.5
• Media player and version: mpv 0.41.0

Additional context
Run via Determinate Nix, although same happens when SyncPlay is installed via pacman (for some reason it installs older version 1.7.4, the problem, however, is the same). Also see #787