This post gives you solution to vlc media player rebuilding font cache message stuck when tries to play any kind of media file.
Occasionally when starting a media file on VLC media player, a dialog box saying rebuilding font cache accompanied by "Please wait while your font cache is rebuilt This should take less than a few minutes" would occur. This will happen every time when you first play VLC Player with any file/stream after its installation.VLC rebuilds fonts cache to show subtitles for files which are shown at bottom of screen while playing.
Occasionally when starting a media file on VLC media player, a dialog box saying rebuilding font cache accompanied by "Please wait while your font cache is rebuilt This should take less than a few minutes" would occur. This will happen every time when you first play VLC Player with any file/stream after its installation.VLC rebuilds fonts cache to show subtitles for files which are shown at bottom of screen while playing.