= Android: Screen sharing via HDMI grabber =

'''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).
 1. USB-C / HDMI Adapter (plugged into the tablet)
 1. HDMI cable (between 2 and 4)
 1. HDMI Grabber (plugged into the notebook). If the USB port of the HDMI Grabber is to big, use a 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.