epiphan VGA Grid, Руководство пользователя

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Overview
6
VGA Grid User Guide
VGA Grid consists of the VGA Grid Concentrator with installed internal capture cards
and external frame grabber hardware devices:
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VGA Grid Central Unit (Concentrator) is a 4U rackmount server with hardware
for video/audio capture, Gigabit Ethernet and proprietary firmware. It connects
to local sources and remote sources (via network) capturing video and audio
and can be managed through the Web admin interface. The number of internal
VGA/DVI capture cards installed in the rackmount server chassis determines
how many local sources can be connected to the VGA Grid.
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External network frame grabbers used in conjunction with VGA Grid
Concentrator allow you to capture, broadcast and record video and audio from
the remote sources through the Ethernet connection.
The VGA Grid Concentrator is connected to a network with an Ethernet connection.
The VGA Grid Concentrator and external frame grabber hardware devices support
both DHCP and static IP address assignment. Once connected to the network, they
can be configured and operated through an easy to use web interface.
When recording content administrators have a choice between AVI and MOV file
formats. Channels may be recorded to separate single-track files or combined into a
single multi-track file. Recorded files may be downloaded from the VGAGrid via the
Ethernet port to enable playback from an external computer.
To view streamed content, viewers are simply provided with the corresponding
unique URL which is automatically assigned to each output stream
The VGAGrid supports a range of storage options including standard hard disks, solid
state devices, removable drive options, and RAID configurations for storing recorded
content.
The VGA Grid supports streaming over HTTP, RSTP, peer-to-peer and multicast RTP.
Except for peer-to-peer and multicast RTP, all streaming types can be sent to a
Content Distribution Network (CDN) to maximize the number of concurrent viewers.
The decision on how to stream a broadcast will depend on many factors including
the number of expected viewers, destination devices used for viewing (e.g. iPAD,
laptop), and network capabilities between source and destination. For further
details on broadcasting strategies, please refer to Streaming.
The figure below illustrates how the VGA Grid fits into a network to allow a
broadcast consisting of video and optionally audio to be streamed to local and
remote viewers. While the broadcast is running, the VGA Grid can be recording the
broadcast to be retrieved at a later time.