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Lecture Recorder x2

VGA Grid

Frequently Asked Questions

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Check out our quick answer guide.


  1. What is the difference between Standalone and Networked VGA Grid solutions?
  2. How much storage does the VGA Grid have for recording?
  3. How many video sources can VGA Grid include in a multi-view channel?
  4. How many video channels can a VGA Grid system record and stream at the same time?
  5. What is the difference between a VGA Grid and a VGA Grid Concentrator?
  6. Can I connect a VGA Grid HD Encoder to a VGA Grid or only to a VGA Grid Concentrator?
  7. Can I use a VGA Grid HD Encoder by itself to stream or record?
  8. How is the VGA Grid HD Encoder different than the VGA2Ethernet product?
  9. Does the VGA Grid Concentrator offer centralized management for all of the connected VGA Grid HD Encoders?
  10. Does the VGA Grid perform playback of recorded files?
  11. How do I know how much storage is required for my application?
  12. How many streaming clients can the VGA Grid support for a single stream?

1. What is the difference between Standalone and Networked VGA Grid solutions?

A Standalone VGA Grid solution performs capture, synchronization, encoding and streaming of video and audio sources which are directly connected using DVI, HDMI, VGA, component, S-Video or composite cables.  A Networked VGA Grid solution separates the capture and encoding process from the synchronization, recording, and streaming.  Video and audio sources are connected to VGA Grid HD Encoders which perform capture and encoding.  This encoded data is then transmitted across an Ethernet/IP network to a VGA Grid Concentrator which performs synchronization, recording and streaming of the received data.

2. How much storage does the VGA Grid have for recording?

The VGA Grid and VGA Grid Concentrators come standard with a single 3 TB HDD for recordings.  This can be upgraded to include more storage, SSD instead of HDD, or redundancy.

3. How many video sources can VGA Grid include in a multi-view channel?

The VGA Grid has no hard limitations on how many video sources can be combined into a single multi-view channel.  For a Standalone VGA Grid the limit is the maximum number of video sources (6 HD + 6 SD) which can be connected.

4. How many video channels can a VGA Grid system record and stream at the same time?

A Standalone VGA Grid solution can simultaneously record and stream 6 HD video sources, 6 SD video sources, and 1 audio source.  A Networked VGA Grid Solution supports connection of 64 VGA Grid HD Encoders each of which can capture and encode a single video source (HD or SD) and a single (stereo) audio source.

5. What is the difference between a VGA Grid and a VGA Grid Concentrator?

A VGA Grid refers to a Standalone VGA Grid solution which contains internal capture cards for direct connection of video sources.  A VGA Grid Concentrator is a part of a Networked VGA Grid Solution which contains no internal capture cards; instead it receives data from connected VGA Grid HD Encoders.

6. Can I connect a VGA Grid HD Encoder to a VGA Grid or only to a VGA Grid Concentrator?

VGA Grid HD Encoders are only for connection to a VGA Grid Concentrator (which has no internal capture cards).

7. Can I use a VGA Grid HD Encoder by itself to stream or record?

No.  The VGA Grid HD Encoder works only in conjunction with a VGA Grid Concentrator.  Epiphan’s Broadcaster and Recorder products are designed to perform capture, encoding, recording and streaming as standalone units.

8. How is the VGA Grid HD Encoder different than the VGA2Ethernet product?

The VGA2Ethernet product is a frame grabber. It performs capture of the connected video/audio sources, but does not perform encoding (e.g. H.264, MPEG-4). The VGA Grid HD encoder performs both capture and encoding. Therefore the VGA Grid HD Encoder enables a far more scalable recording and streaming solution. The VGA Grid HD Encoder replaces the the VGA2Ethernet in the role of performing remote capture of video/audio sources for a VGA Grid Concentrator.

9. Does the VGA Grid Concentrator offer centralized management for all of the connected VGA Grid HD Encoders?

Yes, the VGA Grid Concentrator acts as a single management point for all connected VGA Grid HD Encoders. Changes to VGA Grid HD Encoder settings (e.g. frame size, bitrate, etc.) are made in the VGA Grid Concentrator control interface which then forwards them to the corresponding VGA Grid HD Encoder. Similarly, a status screen of the VGA Grid Concentrator displays status and alarms for all of the connected VGA Grid HD Encoders.

10. Does the VGA Grid perform playback of recorded files?

No.  Recorded files can be downloaded from the VGA Grid (or VGA Grid Concentrator) to a computer which can then perform playback.  Alternatively, recorded files may be automatically transferred using FTP to centralized network storage to facilitate subsequent access and playback.

11. How do I know how much storage is required for my application?

The amount of storage required depends on the number of channels, the bitrate of those channels, and the amount of time for which the channels need to be recorded.  The bitrate for each channel is configurable.  Summing the bitrates for all channels and then multiplying by the amount of recording time gives a good approximation of the storage required.

12. How many streaming clients can the VGA Grid support for a single stream?

The VGA Grid and VGA Grid Concentrator can support many (50+) simultaneous streaming clients using unicast connectivity to each of them.  It also has support for connection to video servers (e.g. Wowza) or Content Delivery Networks in order to support very large number of streaming clients.