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Video Capture Card diagnostic guide

Video Capture Card: test the fault before changing parts or settings.

Test whether the capture card appears as a browser-visible camera/video device before changing OBS, streaming or USB configuration.

3 relevant tests3 first checksBrowser limits stated

Start with a clean baseline

Separate enumeration, permission, actual video frames, active resolution/frame rate and source/capture format. 'Detected' is not the same as 'working correctly.'

Live evidence

Relevant checks

Webcam TestOpen your webcam locally to verify that the browser can access and display a live camera stream.
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Webcam Resolution TestCheck the active video track resolution your browser receives from the camera.
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Webcam FPS TestEstimate the actual delivered webcam frame rate.
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First sequence

Do the high-signal checks before risky changes

  1. 1

    Select the capture card in DeviceOK webcam test

  2. 2

    Confirm source device is outputting video

  3. 3

    Compare OBS/streaming app only after browser video works

Decision points

What the result should change

If live preview worksPrioritize the affected meeting/streaming app, selected source, virtual camera or profile.
If video works only at a lower modePrioritize cable/USB bandwidth, hub/dock topology or unsupported source mode.
If no frames arrive anywhereSimplify to direct connection, OS recognition and official firmware/driver guidance.
Browser can help check
  • Open UVC-compatible capture devices as cameras
  • Report active resolution/frame rate
Browser cannot prove
  • Test HDMI source electronics
  • Read HDCP state reliably
  • Repair capture-card firmware

Repair boundary

Know when to stop browser troubleshooting

  • A browser cannot diagnose image-sensor electronics or lens alignment.
  • Capture cards can be limited by HDMI format/HDCP/EDID even when USB enumeration succeeds.
  • Do not install unsigned camera/capture drivers from download aggregators.

Used-device inspection

What to verify before paying or signing off a repair

  • Verify the exact resolution/FPS modes you need
  • Test microphone if integrated
  • For capture devices, verify passthrough and capture are separate specifications