+ /** There are two SMPTE standards describing subtitles, 428-7:2010 and 428-7:2014, and they
+ * have different interpretations of what Vposition means. Though libdcp does not need to
+ * know the difference, this variable stores the standard from the namespace that this asset was
+ * written with (or will be written with).
+ */
+ SubtitleStandard _subtitle_standard;