After an update of VLC media player, it became unable to add .srt
subtitle files. When I run it in the terminal and try to add a subtitle file, it outputs core stream error: cannot pre fill buffer
.
I've already tried reinstalling.
I'm running VLC 2.2.0 on Ubuntu 15.04.
I don't know if this can help but I had a lot of problems with VLC after a fresh installation.
I found the answer on my own which is documented there Full mess on VLC after fresh installation - ubuntu 14.04
Hope this could help you