location: Diff for "androidHdmiGrabber"

Institute of Mathematics - PublicMathWiki:

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⇤ ← Revision 1 as of 2021-05-17 21:46:54 →
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Editor: crose
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Deletions are marked like this. Additions are marked like this.
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= Android: Screen sharing via HDMI grabber = = Android: Screen sharing via HDMI =
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Solution:  '''Solution:'''
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 * Share the tablet screen to a Notebook via HDMI. 
 * The Notebook uses the shared screen 		  * Share the tablet screen to a Notebook via HDMI.
 * The Notebook uses the shared screen
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  * a) like a 'webcam' or 
  * b) shows the shared screen and reshare the window.		   * a) like a 'webcam' or
  * b) shows the shared screen and reshare the window.
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== Hardware == '''Comparison'''
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 # Android Tablet with USB-C connector (Samsung Galaxy S4, S6).
 # USB-C / HDMI Adapter (plugged into the tablet)
 # HDMI cable (between 2 and 4)
 # HDMI Grabber (plugged into the notebook). If the USB port of the HDMI Grabber is to big, use a USB extension.		  * A similar setup can be reached with
=== Hardware ===
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 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.

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.

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.

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.

PublicMathWiki: androidHdmiGrabber (last edited 2021-05-17 22:27:08 by crose)