VLC player by default allows only one multimedia file at a time to be opened and played in Windows.
What this means is that if there are one or more video/audio files that need to be opened, they can’t be played simultaneously. The video/audio file that is currently being played will be replaced by the other one opened after that.This is because VLC player limits the default instance to just 1.
In order to change this so that many audio/video files can be played simultaneously :
From VLC player interface, choose Tools > Preferences.
From the Interface section, scroll down to “Playlist and Instances” and remove tick marks next to “Allow only one instance” and “Use only one instance when started from file manager”.
All done. From now on, multiple audio/video files can be opened using VLC player simultaneously.