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.

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 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

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.

• Frame Rate: doesn't matter
• Resolution: 1920x 1080
• Camera output: MJPG - Motion JPEG

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.