[DVDnav-discuss] offset error in libdvdread 4.2.0

[John Stebbins]

On 10/04/2012 05:21 PM, Dallen Wilson wrote:
> Hi,
>
> I've encountered the "pgc->cell_playback_offset != 0" error in
> libdvdread 4.2.0. I know a similar bug was fixed with the release of
> 4.2.0, but it seems that newer discs have changed something yet again.
>
> I downloaded and compiled libdvdread from svn yesterday, then compiled
> the latest version of ogmrip myself to ensure it was linked against the
> svn copy and can confirm the error still shows up when trying to rip the
> disc.
>
> The movie was Marvel's 'The Avengers'. It seems to play more-or-less ok
> in Totem movie player on Ubuntu, with the exception of selecting or
> skipping chapters. I even had to watch all the previews. Lots of
> "libdvdnav: chapter NOT FOUND!" and "Please send bug report - no
> VTS_TMAPT ??" in the console but other then that, fine.
>
> Attached is the log from 'ogmrip --debug', which consists almost
> entirely of output from libdvdread. Let me know if there's any further
> information that I can provide, I will be offline for possibly up to a
> week but I will respond when able to.
>

A gdb backtrace would be more useful.  It is possible the problem is in the application rather than in libdvdread.  We
found a similar bug in HandBrake just yesterday.  cell_playback_offset == 0 results in cell_playback == NULL results in
NULL pointer access in application.

-- 
John      GnuPG fingerprint: D0EC B3DB C372 D1F1 0B01  83F0 49F1 D7B2 60D4 D0F7


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