I have simmilar issue, but linked to nautilus. Cannot find what caused it, might be user swithcing also.:
org.gnome.Nautilus[10750]: [00007f6e9001c640] vdpau_chroma filter error: video mixer attributes failure: An invalid handle value was provided. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers-418 in Ubuntu. https://bugs.launchpad.net/bugs/1846374 Title: Having a video playing/paused when switched to another user generates gigabytes of error logs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-418/+bug/1846374/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp