Lets a native desktop preview recording start when the capture host is locked or its display is off and the normal video source cannot start. The fork keeps capture tied to the requesting preview tab and falls back to recording its page frames after a native NotReadableError. Stop releases the capture resources as usual. This fixes starting a new recording; it does not establish that an existing recording survives every lock or display transition.
This fork
Preview loaded
A native desktop preview tab is already loaded while the host is unlocked and its display is on.
Host locked, display off
The human locks the capture host and turns its display off. The same preview tab stays loaded.
Recording requested
Start arms capture for the requesting preview tab without presenting or focusing the window.
Native video acquisition fails
The native video source rejects acquisition with NotReadableError: Could not start video source.
Page frames become video
The fork falls back to native page images, decodes them into the recording canvas, and starts recording changing frames from the same tab.
Stop completes the recording
Stop ends the fallback and releases its capture resources. The recorded video can be saved.
Video saved. Capture resources released.
Original
Preview loaded
A native desktop preview tab is already loaded while the host is unlocked and its display is on.
Host locked, display off
The human locks the capture host and turns its display off. The same preview tab stays loaded.
Recording requested
Start attempts to acquire the native video source for the preview.
Native video acquisition fails
The native video source rejects acquisition with NotReadableError: Could not start video source.
Startup ends in an error
The acquisition error ends startup. There is no page-frame fallback to supply video.
No recording produced
The failed attempt has no recorded video to return.
No video to save.
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