Android: Screen sharing via HDMI

Solution:

• Share the tablet screen to a Notebook via HDMI.
• The Notebook uses the shared screen
  • a) like a 'webcam' or
  • b) shows the shared screen and reshare the window.

Comparison

• A similar setup can be reached with

Hardware

1. Android Tablet with USB-C connector (Samsung Galaxy S4, S6).
2. USB-C / HDMI Adapter (plugged into the tablet)
3. HDMI cable (between 2 and 4)
4. HDMI capture stick (plugged into the notebook). If the USB port of the HDMI capture stick is to big, use an USB extension.

Use with BBB in a Y27 seminar room

Part 1: Setup BBB

• Power on the Seminar room laptop.
• Open the browser.

• Login to MY > start a BBB stream (or use MS-Teams, Zoom).

• Share the notebook screen in BBB - or just the guvcview window (see below).

• Students in the room: switch on the beamer (small black box, takes 2 minutes to power on).

Part 2: Share tablet screen

• Connect the tablet with HDMI Capture stick to the notebook (see hardware above).

• Samsung: do not use Samsung DeX .. the tablet will act as a notebook, not as a tablet (in this scenario more disadvantage than advantage).

• Start guvcview (webcam icon on the left panel)

  • Select the right video source:

    • On tab Video Controls select device: USB Video: USB Video.

    • There are probably two (same name), check both.

    • A popup appears: Launch new process or restart? >> restart.

• Resolution: 1920x 1080

• Keep the guvcview open. To bring the tablet share window to front, click in it.

Conclusion:

• The notebook webcam can still show the speaker.
• A window (=guvcview) is the tablet screen.
• The quality should be fine for streaming as well as beamer presentation (both at the same time).
• The seminar room microphones are used as regular.