= 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).
 1. USB-C / HDMI Adapter (plugged into the tablet)
 1. HDMI cable (between 2 and 4)
 1. HDMI capture stick (plugged into the notebook). If the USB port of the HDMI capture stick is to big, use an USB extension.

{{attachment:tablet-hdmi-capture.png}}

=== 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.

{{attachment:guvcview.png}}

'''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.