Kill VLC in terminal:
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This does not require root/sudo. This is to stop when loading file hangs on loading from external storage:

killall -s SIGKILL vlc 

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Sources:
https://bbs.archlinux.org/viewtopic.php?id=167478
https://askubuntu.com/questions/1236313/vlc-player-running-in-the-background-as-root-with-100-cpu-usage

Date: May 5th, 2021