[DVDnav-discuss] dvdbackup and the skipping unused/bad sectors patch

[Don Mahurin]

Thanks Nico.

Also, a bit unrelated, a few years ago I patched libdvdnav to rely on
the cell boundaries in the IFO file rather than cell changes in the
media stream.
The purpose for this was to allow custom user IFO's that could define a
custom movie sequence.
With this change, cell boundaries could be modified in an IFO, and the
video would still work even if the cell numbers were not updated
in the VOB's.
This patch to libdvdnav is very small. I just now updated the patch for
4.1.3, such that the change is off by default. (Off course I would
rather it be enabled by default...).

Could you also take a look at this patch sometime.
More information on "uifo" is below.

http://uifo.openright.org/
http://uifo.openright.org/libdvdnav-4.1.3-trust-ifo-cell.patch

Thanks.

-Don

Nico Sabbi wrote:
> On Friday 09 January 2009 18:40:03 Don Mahurin wrote:
>   
>> Hi,
>>
>> I have an updated version of "dvdbackupx" that uses the vm in a
>> modified libdvdnav to find and skip unused (possibly intentionally
>> bad) blocks on a DVD.
>> This version no longer skips commands. All commands are executed by
>> the dvdnav vm.
>>
>> http://dvdbackupx.openright.org/
>> http://dvdbackupx.openright.org/dvdbackupx-0.2-2.tar.gz
>> http://dvdbackupx.openright.org/libdvdnav-4.1.3-vm.patch
>>
>> The basic modifications required of libdvdnav are:
>>
>> - allow vm->dvd to be NULL.  In the case of using the vm
>> externally, vmvm->vtsi and vm->vmgi are set, and these values
>> should not be reset and the dvd should not be re-opened.
>> - Make the state of TailPGC execution detectable. This is required
>> so that end can be detected externally. This is done by setting pgN
>> to nr_of_programs+1 in play_PGC_post.
>>
>> If this patch is applied to libdvdnav, then it could be used
>> unmodified by dvdbackup.
>> The current version of dvdbackupx includes the entire libdvdnav
>> archive, patches it, and uses only the vm parts.
>> Ideally, either the vm functions would be officially exposed by
>> libdvdnav, or separated into libdvdvm.
>>
>> Could I ask that someone take a look at my dvdnav changes and
>> dvdbackupx and comment on how we can use the dvdnav vm officially
>> for this?
>>
>> I can give more details of how the dvdbackupx modification works if
>> needed.
>>
>> -Don Mahurin
>>     
>
> thanks for the patch. I'll review it in the week end
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