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SyncPlay crashes on launch when using mpv #786
Description
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:
- Launch syncplay with mpv player
- 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
Activity
Et0h commentedon Jul 31, 2026
I don't have SteamOS so unfortunately I can't be of much help. SteamOS is not on the list of supported platforms, so it is possible that changes would be needed to support this OS but I have no idea what they would be.
I did however fix the version detection I noticed, but doubt it is the root cause of your problem: b350f9d
AlySerry0 commentedon Aug 11, 2026
Related to the crash pattern in #787 - if the media player fails to start, Syncplay's GUI can hit an unhandled
AttributeErrorwhen you try to open a file, instead of showing a proper error message. Opened a fix for that specific crash in #794. It doesn't address why mpv itself failed to launch on your setup, but it should stop the resulting crash and surface a clearer message instead.Guard against crash when opening a file before the media player is ready
Guard against crash when opening a file before the media player is ready
Guard against crash when opening a file before the media player is ready