found the problem.. its the whole folder that I had copied from my backup drive onto my home folder.. just tried a few songs and movies from the backup drive and they play just fine..
what ? did the copying get corrupt somehow ?
Great, glad it's resolved.
I hate to say this but they might be seriously fragmented, like
75% instead of just 1 or 2 percent, which is not supposed to
happen in Linux, but many, many updates over time can do so eventually.
Can't think of anything else, I'd try the copy over then.
Have a good one.