ONVIF clients (explained)

ONVIF clients are computer appliances or software programs that use ONVIF Webservices. Examples of ONVIF clients are servers, media players, IP-based surveillance systems, or Sterowniki ONVIF.

The Real Time Streaming Protocol (RTSP) is used to establish and control media sessions between two or more endpoints. The Milestone Open Network Bridge uses ONVIF Profile S and RTSP to handle requests for video from an ONVIF client, and to stream video from an XProtect installation to the ONVIF client.

By default, communication between ONVIF clients and the Milestone Open Network Bridge server uses the following ports:

• ONVIF port 580. ONVIF clients use this port to submit requests for video streams
• RTSP port 554. Milestone Open Network Bridge uses this port to stream video to ONVIF clients

ONVIF clients can access the RTSP port on the Milestone Open Network Bridge directly. For example, the VLC media player or a VLC plug-in in a browser can retrieve and display video. This is described in this document in Use a media player to view a video stream.

You can use different ports to, for example, avoid a port conflict. If you change the port numbers, you must also update the RTSP stream for the ONVIF client URI.

The Milestone Open Network Bridge server supports H.264, H.265 and MJPEG codecs.

Cameras must be able to stream video in either H.264 or H.265 codec. For JPEG video streams, RTSP supports video streaming from cameras providing MJPEG.

The server detects the codec type according to the device driver settings. If that fails, it tries to resolve it from the Video Stream name based on the JPEG string.

For audio streams, the Milestone Open Network Bridge server supports live audio for codecs G.711 (u-law) and AAC.