Speed of Video Transmission
The majority of webcams will shoot at 30 or 60 frames per second. However, the darker your setting, the longer the exposure time and the wider the aperture required to effectively illuminate your photo.
For the mathematically interested, the maximum framerate is one divided by the exposure duration. Lighting has the same effect on webcam videography as it does on photography.
Exposure duration and shutter speed must be considered, but unlike photography or even traditional videography, we rarely have the same manual control over these settings as we have with a professional camera.