+
+class FFmpegSubtitlePeriod
+{
+public:
+ FFmpegSubtitlePeriod (ContentTime f)
+ : from (f)
+ {}
+
+ FFmpegSubtitlePeriod (ContentTime f, ContentTime t)
+ : from (f)
+ , to (t)
+ {}
+
+ ContentTime from;
+ boost::optional<ContentTime> to;
+};
+
+extern FFmpegSubtitlePeriod subtitle_period (AVSubtitle const &);