The ltmmDVD_SUBPICTURE_TYPE constants define the subpicture stream type.
typedef enum ltmmDVD_SUBPICTURE_TYPE
ltmmDVD_SPType_NotSpecified = 0,
ltmmDVD_SPType_Language = 1,
ltmmDVD_SPType_Other = 2
 The DVD does not specify the subpicture type.
 The subpicture contains language-related content such as movie subtitles or other text.
 The subpicture contains nonlanguage-related content such as a bouncing ball in karaoke titles.
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