Use permission, live track, first frame, negotiated settings and delivered cadence as separate evidence stages.
IP-CAM-01 / VIDEO STREAM / SETTINGS
Webcam Preview and Settings Test
Open a private local preview and inspect negotiated resolution, FPS, aspect and controls.
A webcam is missing, black, mirrored or using the wrong mode.
This focused entry uses the shared Camera protocol. The measurement logic and Evidence version remain identical to the complete lab.
Remove the easiest false alarms first.
01
Close other camera apps, select the intended device and allow exposure and focus to settle.
02
Keep lighting and scene detail stable during FPS, bitrate and image-signal comparisons.
03
Compare requested, negotiated and delivered settings instead of relying on one resolution label.
Run one repeatable protocol.
- 01
Grant permission and select the intended camera.
- 02
Choose a requested profile and inspect negotiated settings.
- 03
Capture a local still for focus and exposure review.
Evidence the result should expose.
DIRECT / INFERREDNegotiated settings
DIRECT / INFERREDLive preview
DIRECT / INFERREDCapabilities
DIRECT / INFERREDLocal still
Separate observed, review and inconclusive.
Repeat a failed mode or low delivery ratio after changing one factor: lighting, USB path, resolution or system load.
A browser mode failure does not prove the sensor lacks that mode, and relative image signals are not optical calibration.
Start with the likely path, then retest.
01
Permission
02
Another app
03
Wrong camera
04
Unsupported mode