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USB Video Class (UVC) and why many webcams work without a vendor driver

USB Video Class defines standardized USB video-device behavior used by many webcams and other video products.

Why it matters

How this changes a diagnosis

Understanding UVC helps explain why a webcam can appear through the normal browser camera API even when it is not eligible for WebUSB. The operating system may already be handling it through a standard video class driver.

Key points

What to remember

  • UVC is a USB device-class specification for video.
  • Browser camera access normally uses the operating system media stack rather than raw USB commands.
  • Vendor software can still add features beyond standard class behavior.
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Where this concept appears

WebcamVideo Capture Card