Frame Rate (FPS)
技術The frequency at which unique consecutive images (frames) are displayed per second.
What is Frame Rate?
Frame Rate, measured in Frames Per Second (FPS), indicates how many distinct images are displayed consecutively in one second of video. The higher the FPS, the smoother the motion appears to the human eye.
Common FPS Standards
- 15 FPS: Often the minimum for acceptable video conferencing stability on poor connections. Motion looks choppy.
- 24 FPS: The standard for cinematic movies.
- 30 FPS: The standard for television and most video calls. Provides fluid, natural motion.
- 60 FPS: Used for high-speed gaming or sports. In video calling, this is rarely necessary unless sharing a screen with fast-moving content (like a video game or detailed animation).
Impact on Bandwidth and CPU
Doubling the frame rate (e.g., from 30 to 60 FPS) roughly doubles the amount of data that needs to be encoded and transmitted. This places a higher load on the device's CPU and requires more bandwidth.
In WebRTC applications, screensharing often defaults to a lower frame rate (e.g., 5-10 FPS) to prioritize text clarity (resolution) over motion smoothness, whereas camera feeds prioritize 30 FPS for natural facial expressions.