Re: libdvdread, ifo_types.h and VIDEO_TS.IFO

Thank you for the information.  I will look at adding the libdvdread 
disk_id function to my approach.

Russ

Bj|rn Englund wrote:
> Mon May 08 2006, Russ Turner wrote:
> 
>>I am writing an application that will automatically and reliably (!)
>>determine the title of a commercial DVD.  Some DVD's provide enough
>>information in a separate disc.id file, but others do not.  The
>>"Provider ID:" field in VIDEO_TS.IFO sometimes has helpful data.  But
>>in other cases, while there is useful information in the VIDEO_TS.IFO 
>>file, it is not in "Provider ID" or the other data that is defined in 
>>ifo_types.h and reported by libdvdread (ifo_dump).  The Sony movie 
>>"Radio" is an example of such a DVD.  The name of the movie and the 
>>studio can befound in VIDEO_TS.IFO with grep or cat, but is not reported 
>>by libdvdread.
>>
>>Are there additional IFO types that I can add to the header file and the
>>libdvdread programs that will capture this additional IFO information?
>>
> 
> 
> Yes, if you get the title name when doing a grep on the .IFO file the
> dvd probably implements Text Data. This is not completely implemented
> in libdvdread. There were very few dvds with text data before so we didn't
> have anything to test with. I haven't checked lately if more dvds are using
> it.
> 
> There will be many dvds where you won't be able to extract the title name
> automatically from. Are you going to add those titles in a separate database
> or just ignore them?
> If you are planning to use a separate db you should
> use the disc_id function in libdvdread to identify the dvd.
> It md5sums the first 10 ifo files on a disc.
> Although this won't guarantee the disc_id to be 100% unique I haven't
> seen any discs where it fails, and it works if you have copies of the
> dvd files on hd as well, unlike approaches where info from the udf/iso
> filesystem on the dvd is used. Of course you could use a combination of both.
> 
> /Bj|rn
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