Default cast device feature not working

[hugues999]

Describe The Bug

The Set as default option for cast devices has not been working since 10.9.9 (and 10.9.10). It is lost any time we reload the web app or restart any Jellyfin client.

A similar bug was opened for this and was closed as fixed for 10.9.10 but it didn't seem to fix it: #5878.

Steps To Reproduce

1. Open the web application in a browser
2. Click the cast button
3. Select a cast device, for example MPV-Shim
4. Click on the cast device, check "Set as default"
5. Reload the page
6. The cast device is unselected, back to local playback

Expected Behavior

Normally, up to 10.9.8, selecting "Set as default" for a cast device meant that this device would automatically be connected when opening the client.

Logs

Screenshots

System (please complete the following information):

• Platform: Windows
• Browser: Chrome
• Jellyfin Version: 10.9.10

Additional Context

These steps can also be reproduced on any Jellyfin client, I have the same problem in the Windows desktop client and in the Android phone app. They would all select the default cast device previously before 10.9.9.

Thank you!

[viown]

This does seem to work as expected when running in development mode locally but not on the current production version and I'm still not quite sure why.

[thornbill]

Are there any relevant messages in the browser console?

[thornbill]

I'm hoping this will be fixed by #6013, but I also added a bunch of logging to help us track it further if the issue continues. We will just have to see when the next release happens.

[viown]

It does not seem like this issue is fixed in 10.9.11, it looks like the websocket open event never gets called according to the logs.