Switching playing youtube video to full-screen mode and to default mode lag on Chromium

[Tony Thuitai]

The switching of a playing youtube video to fullscreen mode and also from fullscreen mode to normal mode lags.

Ubuntu version: 19:10
Chromium version: 80.0.3987.163 (Official Build) snap (64-bit)

Steps to reproduce
1. Launch Chromium and open Youtube.
2. Select/search for a video and play.
3. Switch the playing video to full-screen mode and back to normal view.

When playing a video using chromium the switch to full-screen mode and back is expected to be smooth but instead, the switching is laggy.

[Olivier Tilloy (osomon)]

Thanks for the report Tony. Can you confirm that it's only switching in and out of fullscreen mode that's laggy, playback is otherwise smooth?

Could you please run the following command in a terminal to attach additional information to the bug report:

    apport-collect 1871618

[Tony Thuitai (tony-thuitai-deactivatedaccount)]

Olivier, Playback is smooth but the switching to full-screen mode and back is laggy.
Output of the command is:
The authorization page:
 (https://launchpad.net/+authorize-token?oauth_token=0JLWTDmMkwMH1vNl0trs&allow_permission=DESKTOP_INTEGRATION)
should be opening in your browser. Use your browser to authorize
this program to access Launchpad on your behalf.
Waiting to hear from Launchpad about your decision...
Package chromium-browser not installed and no hook available, ignoring.

[Tony Thuitai (tony-thuitai-deactivatedaccount)]

Updated Chromium snap to Version 81.0.4044.92 (Official Build) snap (64-bit) recently but the switching a youtube video to full-screen and back is still laggy but playback is still smooth.

[Olivier Tilloy (osomon)]

Are you in an X11 or Wayland session?

Do you use fractional scaling for high DPI ?

[Tony Thuitai (tony-thuitai-deactivatedaccount)]

comment#4 In X11 session and not using any dpi scaling because my laptop's screen does not require scaling.

[Olivier Tilloy (osomon)]

Thanks for the additional info. Could you maybe test the same thing with Google Chrome (from https://www.google.com/chrome/) and report whether the same thing happens?

Could you grab and attach a video to demonstrate the issue?

[Tony Thuitai (tony-thuitai-deactivatedaccount)]

Attached screencasts of Chromium to demonstrate the issue

[Tony Thuitai (tony-thuitai-deactivatedaccount)]

Screencast of Firefox also attached for comparison

[Tony Thuitai (tony-thuitai-deactivatedaccount)]

Reattached The chromium screencast since the file was corrupted here and comments are not editable

[Tony Thuitai (tony-thuitai-deactivatedaccount)]

Tried attaching recording of the issue on chrome and chromium and also firefox for comparison but the video cannot be played on this end since it got corrupted here but Ok on my PC and chromium bug report.

[Olivier Tilloy (osomon)]

Thanks for the screencast. I think I see what you mean. I feared it was the video playback that was lagging, but it's just the fullscreen transition itself. I can confirm the problem here, although it's slightly faster on my machine. That said, firefox seems to suffer from the same problem here.

[Olivier Tilloy (osomon)]

Corresponding upstream report: https://bugs.chromium.org/p/chromium/issues/detail?id=1070134