[mythtv-users] Many new dvd's not working

[James Courtier-Dutton]

On 11 December 2010 22:17, jedi <jedi at mishnet.org> wrote:
> On Sat, Dec 11, 2010 at 09:22:35AM -0800, Neil Salstrom wrote:
>> On Sat, Dec 11, 2010 at 5:28 AM, James Courtier-Dutton
>> <james.dutton at gmail.com> wrote:
>> >
>> > Have you tried playing it in "xine".
>> >
>> > If you start xine with "xine --verbose dvd://" it will give more
>> > information as to what it happening.
>> > If the DVD works in xine but not in myth then it is a bug in myth.
>> > If it fails in both xine and myth, then there is some new DVD feature
>> > that open source does not support yet.
>> >
>> > Kind Regards
>> >
>> > James
>> > _______________________________________________
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>> > mythtv-users at mythtv.org
>> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>> >
>>
>> I did not try using xine but playing from DVD in VLC worked flawlessly.
>
>    I suspect that VLC treats the disc more as a conventional console DVD
> player would. My usual rip methodology didn't work on that disk (mplayer
> with the dumpstream option), so I just went straight for AnyDVD. Disney
> disks in general seem to be more problematic and Pixar is now a part of
> the mousey beast.
>
>    I also see more trouble with ABC DVDs too (that Disney connection again).
>
>    I have very little trouble with any other DVDs.

I wrote quite a lot of the dvdnav code for Linux. VLC, Myth, mplayer
all use the same lib for DVD playing.
I do not understand what "treats the disc more as a conventional
console DVD player would" means.
Whether one is playing the DVD normally, or extracting the main title
from it, the functions required from dvdnav are identical.
One feature that has not been implemented in dvdnav yet is error-correcting.
If dvdnav see a sector error on the DVD is exits.
What it should really do is do a small jump forward to the next VOBU
when it sees a sector error.
So, I expect the problems people are seeing is that the DVD they are
trying to play has scratches on it, and therefore returns some sector
errors.

So, if people wish to actually fix the problems users seem to be
getting, they need to implement error concealment within dvdnav.
I do not have any time because I am working on other open source projects.

Kind Regards

James