When talking about latency, we are referring to end-to-end latency. We define end-to-end latency as the delay from when an image is captured by a camera until it is visible on a video display. It is divided into 3 major steps impacting the total system latency.
1.2.1 Camera latency
Factors: Stream (Resolution, Image settings, Audio, Compression)
Capture frequency (sensor), Multiple Streams, Image processing…
1.2.2 Network latency
Factors: The network infrastructure, Data amount, Transmission Protocol (UDP / TCP)
Network infrastructure and management
In most cases, a limited network is the largest contributor to jerky| choppy| lagging videos. If the bandwidth is limited, the device will have to compensate the quality of the stream (reduce bitrate) to match the available network infrastructure bandwidth. It will do by lowering the image quality or the framerate. This can result in a choppy video stream.
- Using the Axis Site Designer tool, you can estimate the needed bandwidth depending on the Axis camera model.
- A good network infrastructure that is well managed (QoS, enough bandwidth, Network hops well planned) will highly contribute to a smoother video stream.