[MPlayer-users] MPlayer hangs playing 'Sony Pictures' DVDs.

[mplayerhq.hu at jamesplace.net]

I've had a few DVD's that I have not been able to play via mplayer lately. I 
believe they've all been distributed by Sony Pictures. I start with: mplayer 
dvd://1 and the movie will begin to play. After about 10 second it hangs. I 
can not stop mplayer with <ctrl><c> or 'kill' 

Entries like the following start appearing in my logs.
---
Feb 24 19:45:47 main kernel: scsi6: ERROR on channel 0, id 0, lun 0, CDB: Read 
(10) 00 00 09 f4 20 00 00 40 00
Feb 24 19:45:47 main kernel: Current sr0: sense key Medium Error
Feb 24 19:45:47 main kernel: ASC=10 ASCQ=90
Feb 24 19:45:47 main kernel: end_request: I/O error, dev sr0, sector 2609280
Feb 24 19:45:47 main kernel: Buffer I/O error on device sr0, logical block 
326160
Feb 24 19:46:15 main kernel: scsi6: ERROR on channel 0, id 0, lun 0, CDB: Read 
(10) 00 00 09 f4 22 00 00 3e 00
Feb 24 19:46:15 main kernel: Current sr0: sense key Medium Error
Feb 24 19:46:15 main kernel: ASC=10 ASCQ=90
Feb 24 19:46:15 main kernel: end_request: I/O error, dev sr0, sector 2609288
Feb 24 19:46:15 main kernel: Buffer I/O error on device sr0, logical block 
326161
Feb 24 19:46:43 main kernel: scsi6: ERROR on channel 0, id 0, lun 0, CDB: Read 
(10) 00 00 09 f4 24 00 00 3c 00           
---

I have to reboot stop mplayer. 

The DVD's play find with Kaffeine on the smae machine. What the deal??