[DVDnav-discuss] dvdread patch for broken dvd's

[jezz at hkfree.org]

Hi,
here are my answers. Cosmetics are not problem, but before fixing them, the idea
of this code must be approved. For file there are 2 possible tag values - 261
for File Entry (4/14.9 in Ecma 167) or Extended File Entry (4/14.17). For some
VOBS on DVD there is no File Entry or Extended File Entry. But there is
Extended Attribute Header Entry with tag 262 (4/14.10). If I handle 262 entry
as 261, than DVD plays fine, but that is wrong - EA Header is not File Entry +
some data. It contains data associated with some File Entry, but there is none.
Therefor this DVD is broken. But ISO 9660 filesystem is ok - kernel mounts this
DVD and totem can play it (totem don't plays discs directly, but only mounted).
I can play VOB directly using mplayer, but I can't use dvdnav or some mplayer front-ends.
This ISO stuff uses correct ISO fs if file search on UDF fails. This fixes my
problem - and maybe others, too.


On Ne  5.říj, Nico Sabbi wrote:
> Il giorno dom, 05/10/2008 alle 22.25 +0200, Nico Sabbi ha scritto:
> > Il giorno dom, 05/10/2008 alle 22.12 +0200, Nico Sabbi ha scritto:
> > > Il giorno dom, 05/10/2008 alle 16.56 +0200, jezz at hkfree.org ha scritto:
> > > > Hi,
> > > > I have already posted this to mplayer-users mailing list. I have DVD disc with
> > > > broken UDF structure. I can't play this disc using current libdvdread, because
> > > > vob for chapter 37 is not found - entry in UDF has tag identifier 262 (Extended
> > > > Attribute Header Descriptor) instead of 261 (File Entry).
> > > > ISO 9660 filesystem is correct, so it can be used. When file can't be located
> > > > with UDF functions, then we can try ISO. This fix conforms with standards and
> > > > plays my disks :)
> > > > Patch is created against current svn://svn.mplayerhq.hu/dvdnav/trunk/libdvdread.
> > > > 
> > > > Any comments are welcome. I will be glad if this commit will be accepted to libdvdread.
> > > > 
> > > > Regards
> > > > 
> > > 
> > > thanks, but there are several problems: 
> > > - it's full of cosmetics
> > > - I don't see how you handle the 262<->261 code
> > > - are you sure that all of is09660.c is necessary?
> > > 
> > 
> > one more question: are the specs available here complete?
> > http://osta.org/specs/index.htm
> > 
> > Just searching the table of Tag identifiers I can't find it.
> > It seems that only items in [bold] are specified. Am I missing
> > something? There are referenced to ECMA 167, is that pdf a
> > complementary document?
> > 
> 
> 
> apparently yes, here is what you need :)
> http://www.ecma-international.org/publications/standards/Ecma-167.htm

-- 
Jezz
mail:   jezz at hkfree.org
jabber: jezz at njs.netlab.cz
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