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Video Manager Group IFO (VMGI)
The VMGI is the primary IFO containing all the metadata about the entire DVD. Or, aka IFO zero.
Files are a normal IFO file, the first one on the disc, being VIDEO_TS.IFO
and VIDEO_TS.BUP
.
Here are the headers that are generic to all IFOs: http://stnsoft.com/DVD/ifo.html
And here is some data that is specific to the VMG IFO: http://stnsoft.com/DVD/ifo_vmg.html
libdvdread
See ifoOpenVMGI()
in ifo_read.h