Screen area recorder for Ubuntu - only black screen...

[Oliver Grawert]

hi,
Am Montag, den 22.02.2021, 14:06 +0100 schrieb Bo Berglund:
> 
> So I tried to use a ready-made Linux recorder "vokoscreen" which can
> be
> installed using apt.
> It seems to have the functions I am after but when recording I am
> only getting
> audio, the screen is totally black.
> I have placed the area selector tool above a Firefox window playing
> the video
> and adjusted it to the video area.
> 
> When I record the selector tool changes by removing all controls
> inside the
> video area. So it looks like it is doing what it should.
> 
> But as I said the resulting mp4 video only contains a black screen,
> while audio
> is OK.
> 
> I have read somewhere that it might be caused by some Ubuntu
> permissions that
> does not allow another application access to the data put on screen
> by the video
> player. In this case vokoscreen may not be allowed to read Firefox
> window
> content?
> 
> If this is the case in Ubuntu, how can it be fixed?
> 

this has nothing to do with Ubuntu but with your choice of the desktop
session ... 

GNOME upstream (mainly redhat/fedora) moves towards Wayland as display
technology.

Ubuntu optionally offers you to pick a Wayland session at the login
screen ... 

Wayland by design forbids applications to see each others content so
screen recorders or remote session tools that have been designed for
Xorg are kind of borken on wayland ... there are new ways to achieve
screen sharing in wayland in the works but they are not 100% ready yet
(which is also one of the reasons Ubuntu still defaults to Xorg in ts
LTS releases) ... if you want vokoscreen to work, just make sure to
pick the non-wayland session at the login screen ... you can also test
what session you are running from a graphical terminal:

    echo $XDG_SESSION_TYPE

... will either return X11 (for Xorg) or wayland ...

ciao
	oli
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