I just "apt-get --reinstall install"-ed libxine-extracodecs and it works
fine. I'm closing the bug now.
** Changed in: amarok (Ubuntu)
Status: Needs Info => Rejected
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[Dapper/Edgy] amaroK (1.3.9/1.4) refuses to play any playlist; just skips through
https://launchpad.net/bugs/49344