Webcam Video Input Formats: DV vs Analog vs USB Video

Video input standards at a glance

Webcams send video to a computer through one of three general paths: analog, DV, or USB video. Each path has different requirements for drivers, cables, and capture hardware.

Analog video was the earliest method. It carried a continuous waveform that needed a capture card to digitize. DV, short for Digital Video, is a compressed digital format that was popular with camcorders and can be transported over USB as part of the USB Video Class. USB video is the dominant standard today, with the USB Video Class (UVC) driver built into Windows and other operating systems.

This article explains how DV, analog, and USB video differ, and what that means for buying a webcam today.

• DV: a compressed digital codec that UVC can carry over USB.
• Analog: a continuous signal that requires external digitization.
• USB Video: the modern packet-based protocol with built-in driver support.

DV: the legacy digital codec

DV is a compressed video format originally designed for digital camcorders. It uses intraframe compression to achieve a good balance of quality and data rate. The USB Video Class specification includes DV as one of the supported compressed formats, along with MJPEG. This is stated in the Microsoft UVC driver overview, which lists compressed formats supported by the system-supplied Usbvideo.sys driver: MJPEG and DV.

When a device sends DV over USB, the UVC driver handles it directly, so no proprietary driver is needed. DV is less common in modern webcams, but some legacy cameras and capture devices still use it.

If you have an old DV camcorder, you might be able to connect it via USB if it supports UVC. Modern webcams typically use newer codecs like H.264 or uncompressed formats, which offer better quality or lower bandwidth use.

Analog video: the obsolete path

Analog video predates digital computer interfaces. It uses a continuous signal to represent brightness and color. To use an analog camera with a computer, you need a capture card or USB dongle that converts the analog signal into digital data.

Analog connections include composite, S-Video, and component. These were common on VHS camcorders and early webcams, but they have been replaced by digital interfaces. No current mainstream webcams use analog output.

If you are buying a new webcam, you will not need to deal with analog. The only situation where analog matters is if you are repurposing an old camera, which requires a separate converter.

USB Video Class: the modern standard

USB Video Class (UVC) is a protocol that lets webcams and other video devices work with any computer that has a UVC driver. Microsoft's UVC driver, Usbvideo.sys, is included in Windows and supports UVC 1.0 and 1.1. Windows 8 and later added support for UVC 1.5, which includes the H.264 video codec.

UVC supports both compressed and uncompressed video. The supported compressed formats include MJPEG and DV, and uncompressed formats include YUY2 and NV12. H.264 is supported starting with Windows 8. This means modern webcams can send high-quality video without requiring a proprietary driver.

The physical connection is usually USB-A or USB-C. USB 3.0 and later provide enough bandwidth for high-resolution video. For example, the OBSBOT Tiny 2 uses USB 3.0 to transmit 1080p video without compression. The Elgato Facecam Pro uses USB 3.0 to send H.264 or MJPEG compressed video.

UVC is the reason webcams are plug-and-play. You plug in a UVC webcam and it appears as a camera device without installing anything. This is covered in detail in our guide to driverless UVC webcams.

What to look for in a webcam today

For most people, the input format is not a choice: modern webcams all use USB Video Class. The important specs are resolution, frame rate, lens quality, and sensor size. Instead of worrying about DV or analog, focus on the output resolution and whether the webcam streams compressed or uncompressed video.

If you need a webcam for video conferencing, a 1080p model with a good microphone is sufficient. For streaming and content creation, a 4K webcam with H.264 or MJPEG output may be better. Check the best 1080p webcams and best 4K webcams for recommendations.

Frame rate matters for smooth motion. If you want to record at 60 fps, look for a webcam that supports it, such as those in our best 1080p 60fps webcams roundup. The trade-offs between resolution and frame rate are explained in webcam fps vs resolution tradeoffs.

Drivers, permissions, and connectivity

Even with UVC, your operating system must grant camera access to apps. In Windows, you control camera permissions through Settings > Privacy & security > Camera. You can turn on access for the device and for individual apps, including desktop apps. This is described in Microsoft's camera permission documentation.

On a Mac, you can even use your iPhone as a webcam through Continuity Camera, which is a modern alternative to traditional webcams. Apple provides instructions for using an iPhone as a webcam on a Mac.

The USB connector type also matters. USB-C is the current standard, and most new webcams use it. USB 3.0 and faster provide enough bandwidth for 4K video, as noted in the OBSBOT and Elgato product pages. For more on connector choices, see our article on USB connection types.

What to pick for your use

Questions

Can I connect a DV camcorder to my computer with USB?

Yes, if the camcorder supports USB Video Class and outputs DV. The Windows UVC driver supports DV as a compressed format, so it can handle the stream. However, most modern camcorders no longer use DV.

Do webcams still use analog video?

No. All current consumer webcams use USB digital video. Analog is obsolete for new products.

What is the difference between DV and MJPEG?

Both are compressed video formats supported by UVC. DV was designed for camcorders with intraframe compression; MJPEG uses JPEG compression on each frame. They are different codecs, but both are handled by the UVC driver.

Do I need a special driver for a UVC webcam?

No. Windows, macOS, and Chrome OS include a built-in UVC driver, so plug-and-play works without additional software. You only need to grant camera access to apps.

Does USB version matter for video quality?

Yes. For higher resolutions and frame rates, USB 3.0 provides more bandwidth, which is why premium webcams use it. The OBSBOT Tiny 2 uses USB 3.0 for uncompressed 1080p, and the Elgato Facecam Pro uses USB 3.0 for 4K60.