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

[Jorgen Lundman]

Ah yes, I see now. You and I weren't talking about the same things. 
Ignore me. 261 (File info) and 262 (Extended Attribute Header) seems 
somewhat valid.

Lund

ps. Not related, but FileType 250 (In the user defined range) is a 
ExtFileInfo (266) Tag with filetype set to 250. Not TagID 250.

pps. There are more bugs in opening a path to "VIDEO_TS", even after 
putting in dvdread-1.9.7's DVDOpenPath().

ppps. I did reverse quoting here, my apologies. My habit, sucks to have 
to scroll past old content when reading over VNC. :)



jezz at hkfree.org wrote:
> Hi,
> I think, that my problem is different. I have only 261 & 262 entries. Neither
> 266 nor 250 are present. As workaround I propose to use ISO 9660 filesystem as
> fallback if UDF access fails.
> 
> On Po  6.říj, Jorgen Lundman wrote:
>> jezz at hkfree.org wrote:
>>> 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.
>>>
>> Quite a different route. But yes, you need ExtFinfo support. It is very 
>> similar to Finfo, but pushes the record along somewhat.
>>
>> http://www.lundman.net/cvs/viewvc.cgi/lundman/llink/libdvdnav-4.1.2/src/dvdread/dvd_udf.c?annotate=1.11#l547
>>
>> Don't forget to handle the chains of ADs, instead of just the one like 
>> dvdread assumes (which is probably ok for 99% of DVD images though). I 
>> did that by making a FileAD (instead of over-loading AD like they did, 
>> and fitting filesize 64bit into AD length 32 bit.)
>>
>> http://www.lundman.net/cvs/viewvc.cgi/lundman/llink/libdvdnav-4.1.2/src/dvdread/dvd_udf.c?annotate=1.11#l120
>> (Anyone know what the maximum number of AD chains there can be? ECMA did 
>> not specify).
>>
>> You probably also want to handle filetype 250, which appears to be a 
>> re-direct type block. It will enable you to read UDF2.50.
>>
>> Lund
>>
>> -- 
>> Jorgen Lundman       | <lundman at lundman.net>
>> Unix Administrator   | +81 (0)3 -5456-2687 ext 1017 (work)
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> 
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-- 
Jorgen Lundman       | <lundman at lundman.net>
Unix Administrator   | +81 (0)3 -5456-2687 ext 1017 (work)
Shibuya-ku, Tokyo    | +81 (0)90-5578-8500          (cell)
Japan                | +81 (0)3 -3375-1767          (home)