Not sure what other information I can add here. The bug is not 100% reproducible as launching mpv again did not crash Kwin, but it has happened to me at least three times now.
Please provide the backtrace of the crash.
(In reply to Martin Flöser from comment #1) > Please provide the backtrace of the crash. I was trying to follow the instructions to create a backtrace of the crash here https://community.kde.org/Bugsquad/Basic_Guide_about_Crash_Reporting and I installed the debug package for kwin but I don't see any KDE crash handler dialog even when I reproduce the crash. Is there some other way I can get the backtrace?
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days, the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please set the bug status as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!