How to live stream multiple sources simultaneously

The article explains how to transmit, record and stream live video signals from DVI, VGA or unencrypted HDMI sources using Epiphan’s VGA GridTM. This multi source solution enables you to combine signals from multiple DVI, VGA or HDMI sources and relay them to a single display in a real time. VGA Grid can monitor up to 256 VGA/DVI/HDMI sources in real time over a local network and/or the Internet.

In this example we demonstrate how to capture, record and stream from two video sources. Let’s presume that a physician performs an ultrasound and simultaneously monitors the situation in the operating theatre miles away. The video sources are:

  1. An ultrasound machine directly connected to VGA Grid.
  2. A DVI video camera.

Prerequisites:

  • Two (or more) video sources to capture (VGA, DVI, or HDMI)
  • Epiphan VGA Grid
  • LAN or Network for administration (alternatively this can be done through direct connection via cross-over cable)
  • A computer or laptop on the same network as the VGA Grid (or connected to the VGA Grid via cross-over cable – see the user guide for more information about this connection method)

Step 1: Connect and switch on hardware

  1. Connect the VGA output of the ultrasound device to the VGA input of the VGA Grid using a VGA cable.
  2. Connect the video camera to the VGA Grid using a DVI cable.

Step 2: Create and configure a channel

  1. Start a web browser and enter an IP address of VGA Grid into the address bar. Enter your administrator credentials and click OK. The system displays a VGA Grid application.
  2. Click Add Channel.
    multiple VGA
  3. Click Video source setup.
    multiple VGA
  4. Select Multiple sources from the Use video source drop-down list.
    multiple VGA
    From this point we are starting to configure a 2-source channel that we will use to live stream video. VGA Grid allows us to specify how video from each of sources will be displayed on a screen. In this example, the video stream from the ultrasound device will be viewed in full screen and image of the DVI camera’s video stream will be half the size of the ultrasound picture. It will be viewed in the upper right corner of the screen.
  5. Select the ultrasound device source. In our case, the source’s name is VGA2USB 61079.
    record from DVI
  6. Do not change the position and size values as we need this signal to be displayed in full-screen mode (100% size).
  7. Click Add source and select the DVI camera’s source. Enter the position values: 50×0 – this signal’s image will be shifted 50% to the right with no vertical shift. Enter the size values: 50×50 to reduce the image size.
  8. The system analyses the selected sources and allows adding audio to the channel where it is available. To add audio, select a check box near to the source’s name in the Audio sources mixing section.
  9. Click Apply.Now we need to customize the principal video settings.
  10. Click Stream setup and specify streaming parameters for the channel. On the image below these parameters are highlighted with red.
  11. Select a stream type from the drop-down list.
  12. Select a frame size.
  13. Select the Enable audio check box if necessary.
  14. Click Apply.
    record from DVI

Step 3: Recording setup

  1. If you need to record video during broadcasting, click Files archive.
    multiple vga output
  2. Setup recording time and size limits by clicking the link with the current file type and time/size limits.
  3. Click Apply.
  4. Use the start and stop recording buttons on this page to control recording. Recording will be performed until either of the two limits is reached.

Stemp 4: Viewing live video on the configured channel

  1. Click Channel status.
    multiple vga output
  2. Click the Live Broadcast URL.
    multiple vga output
  3. In the opened tab below you can view live broadcast from the two sources that is being recorded.
    record from DVI
  4. Click Files archive to see a list of the recorded files.
    record live video

Result

Now you know how to record live stream video from multiple sources (VGA, DVI or HDMI) using VGA Grid from Epiphan Systems.

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