[mythtv-users] DVD plays with Kaffeine, but not with builtin Mythtv player?

[Richard]

On 28/01/13 09:16, Per Jessen wrote:
> This feels like it ought to "just work", but although some DVDs play
> fine with the builtin player, not all do.  I have one just now that
> makes the mythfrontend (apparently) grind to a halt at "please wait".
> Playing the DVD with kaffeine afterwards worked fine.
>
> Last night we had another one which refused to start playing until
> we chose chapter 1.  In the log files I later found:
>
> kernel: [560776.331896] sr 1:0:0:0: [sr0]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
> kernel: [560776.331906] sr 1:0:0:0: [sr0]  Sense Key : Illegal Request [current]
> kernel: [560776.331912] sr 1:0:0:0: [sr0]  Add. Sense: Read of scrambled sector without authentication
> kernel: [560776.331922] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 04 00 00 00 02 00
> kernel: [560776.331935] end_request: I/O error, dev sr0, sector 4096
> kernel: [560776.331941] Buffer I/O error on device sr0, logical block 512
> kernel: [560777.142808] sr 1:0:0:0: [sr0]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
> kernel: [560777.142818] sr 1:0:0:0: [sr0]  Sense Key : Illegal Request [current]
> kernel: [560777.142824] sr 1:0:0:0: [sr0]  Add. Sense: Read of scrambled sector without authentication
> kernel: [560777.142833] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 04 00 00 00 02 00
> kernel: [560777.142846] end_request: I/O error, dev sr0, sector 4096
> kernel: [560777.142852] Buffer I/O error on device sr0, logical block 512
>
> Googling the above suggested it is a libdvdcss issue - I have 1.2.12
> installed.  I'll be enabling logging in the mythfrontend next time,
> so this is just in case someone recognises the situation?

What version/build of Myth are you running?  Some DVD patches were 
back-ported to 0.26-fixes about a week ago.  One of those in particular 
was to clean up DVD initialisation, which might be the cause of your 
problems.

I've not had issues with libdvdcss myself, but if it plays with 
Kaffeine, I wouldn't expect it to be a libdvdcss problem.

Myth doesn't touch libdvdcss directly, so the only thing I can think of 
is that the DVD has some form of copy protection that makes certain 
sectors unreadable.  The normal navigation code on the DVD ensures that 
those sectors should never be accessed.  The main purpose of the patch 
was to ensure that Myth follows the instructions on the DVD and doesn't 
try to determine for itself which title/chapter/menu/whatever to jump to.

What do the frontend logs say?  If you're running the latest 0.26-fixes 
build, try getting logs with '-v public --loglevel=debug'.

Richard.