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Ralf avatar Ubuntu

Zoom: window content freezes for participants

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Ralf

When using the Zoom video conference tool under Ubuntu, we sometimes encounter the following problem: The content of a window changes, but after a while, the other participants don't see the changes any longer, so for them, the window is frozen.

This concerns Tcl/Tk applications (see https://stackoverflow.com/q/71998416/3852630) and an X11-based application we use (which copies the focused window into a window which we then share in Zoom), while other applications are unaffected. In earlier Zoom versions, participants sometimes saw black windows; with the recent version, we have the effect that the window freezes (even though the content still changes on the screen).

I have absolutely no idea what could cause such a behavior. Are there any events passed between the application to which the window belongs and the Zoom client? Why does it work for some time and then freeze? Does Zoom stop to copy the content, or is the window content updated at a different place (some video buffer)?

Sometimes the green frame around the shared window starts to flicker when the content freezes, but not always.

If anyone has any idea, I would be really grateful. Thanks a lot.

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