VBrick dme, Admin Manual

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14 © Vbrick Systems, Inc.
is cached at remote locations so that subsequent requesting clients can acquire the content
that is cached on a local server.
Caching
St o ra g e Ext e n s io n Ca p a b ilit ie s
The DME supports Storage Area Network (SAN)/iSCSI storage extension options if needed.
New disks may be added to the VMWare virtual environment as well to extend the current
content area available. At present, these are the only supported extension options available.
SAN/iSCSI Setup
Provision a New Disk
Streaming Overview
The DME can be configured to receive or pull from an encoder, a Flash server, a video
conferencing device, or another DME; it can also serve streams or push streams to an RTMP
server, an RTP server, or to another DME.
The DME supports unicast and/or multicast for both input and output.
Unicast streams typically have one source and one destination; most network traffic between
clients and servers is unicast.
Multicast packets have a single source and multiple destinations. Instead of sending out
individual unicast packets to each client, a single stream of multicast packets can be viewed by
multiple clients. This can save substantial network bandwidth when multiple clients are
accessing the same stream.
Se rv e d VO D St re a m s
The DME has an RTP server, an RTMP server, and an HTTP Progressive Download server
for stored VOD files (including Windows Media files). In server mode, a served stream does
not become active on the network until requested by a client. The client may be a software
player like StreamPlayer or QuickTime running on a PC, a Macintosh, a mobile device, or a
set top box like the Vbrick Multi Format set top box.
The user requests a stream from the DME by directing the client to issue an RTSP/RTMP/
HTTP request via a URL to the DME. The client and the DME then exchange a sequence of
RTSP/RTMP messages to direct the DME to send the program to the client.
The DME server examines the file to determine Transport Type, Video Rate, Audio Rate,
and other parameters. It then plays the stream using optimal settings adjusted for bandwidth,
frame rate, etc.
Note : New content files that are transferred via FTP will not be
available immediately for VOD RTMP streaming until the associated
seek and meta files are generated. Meta and seek files are typically
generated within a few minutes of being transferred.