Grass Valley GV STRATUS Installation v.3.1 - Manual (Page 182)

devices/interfaces in the host file, rather than updating hosts files incrementally as you discover/assign
devices.
SiteConfig does not automatically deploy hosts files to managed devices as you add or remove
devices. If you add or remove devices from the system description, you must re-deploy the modified
hosts file to all devices.
Related Topics
Generating host tables using SiteConfig on page 67
Proxy/live streaming technical details
The K2 Summit system writes proxy files to the proxy location specified in the GV STRATUS
Control Panel application. On the specified device the location is
V:\proxy\ . For each clip recorded,
the K2 system creates a directory and names it with the asset GUID, which is a long, unique string
of characters. These directory names do not correspond to clip names or other human readable
information. The directory contains the proxy files, which include the proxy video and audio files,
as well as thumbnails files and a scene change file. The proxy video file is a fragmented MPEG-4
file. For test purposes, you can open the
proxy.mp4 file in a video player application that supports
fragmented MPEG-4.
The K2 Summit system multicasts the low-resolution live stream using Real-time Transport Protocol,
with UDP ports for the MPEG video with timecode and UDP ports for audio tracks, as defined by
the Session Description Protocol (SDP). For each channel, the K2 system generates a
*.sdp file
that contains the streaming media initialization parameters. The K2 system updates the file whenever
you change the live streaming configuration. You can find these files on the K2 system at
V:\live
streaming . For test purposes, you can open a file in a text editor and read the IP addresses and ports
assigned to the multicast session and other configuration information for the stream.
The K2 Summit system generates for each of its channels the specific live streaming network ports
and IP addresses based on a port base and an IP address base. The port base is the first UDP port
address for elementary streams. The IP address base is the first two octets in the IP address, as
specified by the Internet Assigned Numbers Authority (IANA). By default, the port base is 31820
and the IP address base is 239.192.0.0. With these default bases, the range of network ports is UDP
31820 to 31827 , and the range of IP addresses is 239.192.x.x to 239.195.x.x. Grass Valley
recommends that you use these default settings. However, if necessary for your site's network
policies, you can also change the K2 system's default settings. You can configure the port base and
the IP address base. Only IP addresses specified by IANA for multicast are allowed. Do not attempt
to edit the
*.sdp files, as the K2 system generates them automatically whenever the system is
restarted. If you change the IP address of the K2 system, you must restart in order to update the IP
address in the
*.sdp file.
The K2 Summit system hosts a simple web server over which it delivers the live stream via HTTP.
For test purposes, you can access the live stream by entering a URL of the following convention in
a standard web browser:
http://<httpservername>/live/<k2systemname>_<Cn>.sdp
For example, to view the live stream from channel four on a K2 system named Summit01, the URL
is
http://Summit01/live/Summit01_C4.sdp . The http server name is the same as the name
of the K2 system.
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Understanding system concepts