Use permission, live track, first frame, negotiated settings and delivered cadence as separate evidence stages.
IP-CAM-01 / VIDEO STREAM / SETTINGS
Webcam FPS and Dropped Frame Test
Run a fixed ten-second VideoFrameCallback capture with delivery ratio and stutter evidence.
Webcam video freezes, stutters or delivers fewer frames than negotiated.
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
Keep the preview visible under representative lighting.
- 02
Run the ten-second frame delivery protocol.
- 03
Compare negotiated FPS, delivered cadence and estimated missed frames.
Evidence the result should expose.
DIRECT / INFERREDDelivered FPS
DIRECT / INFERREDDelivery ratio
DIRECT / INFERREDLong frames
DIRECT / INFERREDSevere stutters
DIRECT / INFERREDMissed frames
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
Low-light exposure
02
USB bandwidth
03
System load
04
Mode pressure