Video encoders, also known as video servers, enable an existing analog CCTV video surveillance system to be integrated with a network video system. Video encoders play a significant role in installations where many analog cameras are to be maintained.
A video encoder makes it possible for an analog CCTV system to migrate to a network video system. It enables users to gain the benefits of network video without having to discard existing analog equipment such as analog CCTV cameras and coaxial cabling.
A video encoder connects to an analog video camera via a coaxial cable and converts analog video signals into digital video streams that are then sent over a wired or wireless IP-based network (e.g., LAN, WLAN or Internet). To view and/or record the digital video, computer monitors and PCs can be used instead of DVRs or VCRs and analog monitors.
|An illustration of how analog video cameras and analog monitors can be integrated with a network video system using video encoders and decoders.|
By using video encoders, analog video cameras of all types, such as fixed, indoor/outdoor, dome, pan/tilt/zoom, and specialty cameras such as highly sensitive thermal cameras and microscope cameras can be remotely accessed and controlled over an IP network.
A video encoder also offers other benefits such as event management and intelligent video functionalities, as well as advanced security measures. In addition, it provides scalability and ease of integration with other security systems.
|A one-channel, standalone video encoder with audio, I/O (input/output) connectors for controlling external devices such as sensors and alarms, serial ports (RS-422/485) for controlling PTZ analog cameras and Ethernet connection with Power over Ethernet support.|
Axis video encoders offer many of the same functions that are available in network cameras. Some of the main components of a video encoder include:
Video encoders for professional systems should meet high demands for reliability and quality. When selecting a video encoder, other considerations include the number of supported analog channels, image quality, compression formats, resolution, frame rate and features such as pan/ tilt/zoom support, audio, event management, intelligent video, Power over Ethernet and security functionalities.
One of the main benefits of Axis video encoders is the ability to provide event management and intelligent video functionalities, capabilities that cannot be provided in an analog video system. Built-in intelligent video features such as multi-window video motion detection, audio detection and active tampering alarm, as well as input ports for external sensors, enable a network video surveillance system to be constantly on guard to detect an event. Once an event is detected, the system can automatically respond with actions that may include video recording, sending alerts such as e-mails and SMS, activating lights, opening/closing doors and sounding alarms.
Next topic: Standalone video encoders
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