Virtual Webcam: What It Is and What It Means for Your Audio

The short answer

A virtual webcam is a software-created camera device. Your operating system and apps see it as a webcam, but its picture comes from another source, such as streaming software, a screen, a media file or a camcorder connected through a capture device. The key limitation for speech capture is that many virtual webcams carry video only. Your voice still has to reach the conferencing app through a separate audio input, and you choose that input yourself.

How a virtual webcam differs from a physical webcam

A physical USB webcam is one piece of hardware. It usually shows up as two devices: a camera and, if it has a built-in microphone, an audio input. A virtual webcam has no hardware of its own. It is a driver or software output that sends a processed video feed to any app that accepts a camera. This lets you add overlays, switch scenes or use a better camera than the one built into your laptop. Any microphone is a separate matter.

Aspect | Physical webcam | Virtual webcam

What creates the device | Hardware connected to the computer | Software or a driver installed on the computer

Video source | The webcam's own lens and sensor | Whatever the software sends, such as a camcorder feed, a scene or a screen

Audio | Often includes a built-in microphone listed as its own input | Often none; audio is routed separately

How it appears in apps | Camera, plus a microphone if one is built in | Camera only, in many cases

Using a camcorder as the video source

Using a camcorder as a webcam usually follows one of two paths. In the first, the camcorder's video output feeds a capture device, which the computer recognizes. The capture device may then be used directly as a camera, or passed into software that publishes a virtual webcam. In the second, the camcorder or its companion software presents itself to the computer as a camera without a separate capture device. Which path a particular camcorder supports depends on its model and outputs. No specifications for specific camcorders or capture devices were available for this guide, so check the documentation for your own equipment.

If the camcorder's own microphone picks up your speech, that sound may reach the computer through the capture device. In that case it usually appears as a separate audio input rather than inside the virtual webcam. Some capture devices appear as both a camera and an audio input, and some do not. Here too, your equipment's documentation is the authority.

Practical implications for capturing speech

• Choose the microphone explicitly. In the conferencing app's audio settings, pick the input that actually hears your voice: a USB microphone, a headset, the capture device's audio input or the computer's built-in microphone. Selecting the virtual webcam as the camera does not choose a microphone for you.
• If you want processed audio from your software, use a virtual audio device. Many virtual camera tools, including the virtual camera in OBS Studio, do not send audio through the camera. If you want the conferencing app to receive the audio your software has processed or mixed, you need a separate virtual audio output that the app can select as a microphone.
• Avoid doubled audio. If your software monitors a microphone and the conferencing app also captures that same microphone, listeners may hear an echo or a doubled voice. Each sound source should reach the app by one path only.
• Watch lip sync. Routing video through a capture device and software can delay the picture relative to the sound. If your lips and voice look out of step, many video software tools let you delay the audio to match. How much delay is needed depends on your setup and can only be found by testing.
• Consider microphone distance. A camcorder placed far enough away to frame you well may be too far from your mouth for clear speech capture. A microphone closer to you generally picks up more voice relative to room echo and background noise.

Conferencing compatibility

Most desktop conferencing apps let you pick a camera and a microphone separately, so a virtual webcam usually appears in the camera list next to any physical cameras. Support is not guaranteed. Some apps, browser-based meetings and managed work computers may restrict or not recognize virtual camera drivers. If the virtual webcam does not appear, restart the app after the virtual camera has started. Also check whether the app or your organization's policy limits third-party camera devices. The evidence available for this guide did not include compatibility results for specific apps or versions.

Quick checklist before a call

• Start the virtual webcam or capture software before opening the conferencing app.
• Select the virtual webcam as the camera in the app's video settings.
• Select the input that hears your voice as the microphone in the app's audio settings.
• Use the app's test or preview feature, if it has one, to confirm your voice is clear and not doubled.
• Check that lip movement and speech line up, and adjust the audio delay in your software if needed.

What this guide could not confirm

No verified specifications, measurements, prices or test results for particular virtual webcam programs, camcorders or capture devices were available. The guidance above rests on how these devices generally work. For audio support, latency and compatibility with your conferencing app, rely on your equipment's documentation and your own test call.