1599441 - Issue in Firefox Screen sharing when connected to external monitor(extended desktop mode) in Mac OS (tested in Catalina)

Status: RESOLVED DUPLICATE of bug 1536777

(Core :: WebRTC: Audio/Video, defect, P2)

Description

[Arun]

Attachment: firefox_screensharefix.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:70.0) Gecko/20100101 Firefox/70.0

Steps to reproduce:

Video link of issue - https://tdrive.li/q2Wqd0

• Connect Laptop to external monitor (extended desktop mode)
• Open firefox in the extended screen.
• Open an application in original screen in fullscreen mode.
• From firefox browser in extended screen share the original screen through screen share
• Now move to or open another application (Eg:App store) from original screen .
  In screenshare video , You will see other changes in the screen in only quarter of the screen as in the attached image

Actual results:

In screenshare video , You will see other changes in the screen in only quarter of the screen as in the attached image

Note : This issue is not present in chrome.
Browser : Firefox latest browser(70.1) , old browsers too have the issue

Expected results:

Changed application should appear in full of the screenshare video

Comment 1

[Daniel Bodea [:danibodea]]

I attempted to reproduce your issue, got stuck at sharing my screen and ran out of time. Can you please answer some questions that might help me reproduce it later, please?

1. in step 3: Which application do you open in full-screen mode on the original screen?
2. in step 4: Which app do you use to share your screen? Hangouts? Does it happen with any screen-sharing app?
3. in step 5: you already have an app opened in full-screen mode, so the exact steps would be to exit full-screen mode of the app opened in step 3 and open another one (like App Store) in full-screen mode, right?

Thank you for your contribution!

Comment 2

[Arun]

Which application do you open in full-screen mode on the original screen?
- This is not related to any particular application.
Steps to reproduce the issue
- Connect external monitor in extended mode in Mac.
- Open Firefox in the extended screen.
- In Firefox open a screen sharing site (Eg: https://www.webrtc-experiment.com/Pluginfree-Screen-Sharing )
- Choose share screen option and share the original screen.
- Now go to the original screen -> Open any application-> View that application in full screen mode.
- Now open any other application in original screen .
- Now see the screen share video in Firefox browser . You will find the issue.

in step 4: Which app do you use to share your screen? Hangouts? Does it happen with any screen-sharing app?
- It not with specific app , You can test in any WebRTC supported apps in firefox browser. yes you can check in hangouts. You can also check this in https://www.webrtc-experiment.com/Pluginfree-Screen-Sharing directly.

Comment 3

[Daniel Bodea [:danibodea]]

I have succeeded in reproducing the issue. Not exactly as described, but the issue can be observed using the steps provided, more likely to be observed when scrolling the page. Issue confirmed.

Comment 4

[Christian Walther]

Possible duplicate: bug 1536777