[DVDnav-discuss] [PATCH] handle duplicate language units and pgc's more gracefully

[John Stebbins]

This patch never got accepted (probably because it's touches a lot and
made you nervous), but HandBrake has been applying this for 3 years now.

Some discs have large numbers of repeated language units and pgc's that
cause extreme memory consumption and file i/o issues. scanning all the
titles on such discs is unusably slow. detect such repeats and ref-count
the data structures to avoid reading and storing duplicate info.

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