int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->subtitle_asset()->subtitles_during (
dcp::Time (entry_point + frame, vfr, vfr),
int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->subtitle_asset()->subtitles_during (
dcp::Time (entry_point + frame, vfr, vfr),