Cast screen" crashes after a few seconds on all devices and networks (but "Cast tab" works)

[Alfred-fma]

I’m encountering a recurring issue when using “Cast screen” via Chromecast:
The connection drops after a few seconds (approx. 3–5 seconds), consistently, across:

• Multiple Windows laptops (Chrome and Edge)

• Multiple Wi-Fi networks and locations

• Multiple Chromecast devices (v3, Google TV)

Details:

• “Cast tab” works perfectly and remains stable

• “Cast screen” crashes or disconnects almost immediately

• Behavior is identical across Chrome and Edge (latest versions)

• Hard reset of Chromecast doesn’t help

• I’ve tested with fresh browser installs, incognito mode, no extensions, driver updates, disabled hardware acceleration — nothing resolves it

It seems to point toward a WebRTC bug, a Chrome 125+ regression, or a firmware decoding issue on Chromecast.
Please advise or escalate to engineering if known.

[Calvin_S]

We're running into the same issue, in terms of symptoms. 

We've determined it to be an audio issue based on the logs we see from chrome://media-router-internals/

12:36:27.335

mirroring.OpenscreenSessionHost: SessionError (8), 1���������ۺ�ۺ�ۺ�ۺ�ۺ�ۺ�ۺ�ۺ�ۺ�ۺ�ۺ�ۺfrom audio capture device.

12:36:27.335

Mirroring will stop. MirroringService.SessionError: 8

12:36:27.335

Terminating a session.

We have found 2 work arounds

1) Disable audio on your computer, restart chrome, then start casting

2) Plug a second monitor into your computer and you will have the option to toggle audio on/off before casting. 

We need a more permanent solution though...

[Ashepherdson]

I've seen this mentioned a couple of times , escalating to the team 

[Trailpipe]

Fyi, Google Chromecast team is aware of this screen casting from Win 10/11 issue, fix should be in the upcoming browser update (next week sometime I think)