Grass Valley K2 System Guide v.9.0 - Manual (Page 202)

Proxy and live streaming workflow overview
K2 Summit System
Proxy Storage
Record Encode high res Decode high res
Encode
lo w
res
Grass Valley Control/FTP/Streaming Network
STRATUS Client
High res
SDI in
Clip1
Low res
Clip1
Proxy
stream
to network
Proxy
stream
to network
K2 Summit System
High res
Clip2
Play SDI out
When licensed and configured, a K2 Summit system creates low-resolution representations of
high-resolution media. Similar to PB/EE functionality, the K2 Summit System creates a live stream
of low-resolution media at the SDI input and a live stream of low-resolution media at the SDI output,
whether or not record/play operations are underway. These streams are multicast to the network and
are available to applications on the network. When media is recorded, the K2 Summit system encodes
a high resolution clip and a low resolution proxy clip. The system keeps these clips associated so
any changes take effect simultaneously for both clips.
The GV STRATUS application accesses the low-resolution media over the network. When you
monitor the K2 Summit system SDI inputs and outputs, the application displays the live stream.
When you view an asset, the application displays the proxy representation of the asset. When you
edit an asset, the K2 Summit system makes your changes on both the proxy and the high resolution
asset.
About proxy/live streaming
The K2 Summit system writes proxy files to a CIFS share, using credentials GVAdmin. A proxy
file contains the video track, up to eight audio tracks, and timecode. The file is a fragmented MPEG-4
file, which can record/play in chunks. This allows you to play a growing proxy file while it is still
recording.
Each K2 Summit system channel multicasts a low-resolution live stream. The K2 Summit system
has an HTTP server over which it makes the SDP file available to applications that play the live
stream.
A Type II or Type III CPU module is required to support proxy/live streaming.
An AppCenter Pro or AppCenter Elite license on the K2 Summit system enables proxy/live streaming.
If licensed for AppCenter Pro, a live stream is available from each of the four channels. If licensed
202 K2 System Guide 06 November 2012
Proxy/live streaming