feat(webapp): play session-protocol WebM streams

[irvingouj@Devolutions (irvingoujAtDevolution)]

The shadow player now understands Segment started, queued Pulls, and Stream ended so live clips can reconnect and change size on one websocket.

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

---

_{Stack created with GitHub Stacks CLI • Give Feedback 💬}

[github-actions]

Let maintainers know that an action is required on their side

• Add the label release-required Please cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module) when you request a maintainer to cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module)

• Add the label release-blocker Follow-up is required before cutting a new release if a follow-up is required before cutting a new release

• Add the label publish-required Please publish libraries (`Devolutions.Gateway.Utils`, OpenAPI clients, etc) when you request a maintainer to publish libraries (Devolutions.Gateway.Utils, OpenAPI clients, etc.)

• Add the label publish-blocker Follow-up is required before publishing libraries if a follow-up is required before publishing libraries

[irvingouj@Devolutions (irvingoujAtDevolution)]

Implementation notes:

• shadow-player parses Segment started JSON, implicit segment end, and Stream ended.
• Pull is sent before MSE append so the Gateway can pipeline the next chunk.
• Playback controls and clip list are isolated so resolution/clip changes can swap SourceBuffers.
• recording-player WebM streamer is wired to the same protocol.

Note

LLM-assisted content (no human feedback).

[irvingouj@Devolutions (irvingoujAtDevolution)]

Corrected MSRDP producer-parity validation:

• Final bundle: 2dce10ecef14d68c0ad7b7532419ab9a342198017603ed2ae6116e511ebf9f9b
• Gateway: 8dfc9ff39389419241767e8e8d1bbef02926371c
• Fixture: 33b853540b000c48667edb9dbc88964365f2bb6f
• MsRdpEx: 2026.8.20.1
• LIVE-005 MSRDP/Cadeau → JavaScript passed on IT-HELP-RDM: run 815bb2cea28a42b08a8e774082cdf9b5

The corrected fixture enables recording before connect, keeps one ActiveX control and stable pipe across reconnects, and uses RDM's quality/frame-rate settings. Both Gateway shadow segments decode with the expected dimensions and marker progression. The remaining LIVE-006 failure is downstream: the C# MediaFoundation player advances its timeline but renders black frames.

Note

Human-tuned, LLM-assisted content.