Parole fails to play anything (It says there are a Gstreamer plugin error) with any user. But if I use parole as root, it plays everything well. My users are included in audio / video groups and I have permission access to the files I try to play.
I could solve the problem deleting the gstreamer cache folder into the User home. In fact it was a problem caused by gstreamer. You can mark this as SOLVED. Thanks!