bool_note(' Reference video', c.ReferenceVideo, lambda x: not x)
bool_note(' Reference audio', c.ReferenceAudio, lambda x: not x)
bool_note(' Reference subtitle', c.ReferenceSubtitle, lambda x: not x)
bool_note(' Reference video', c.ReferenceVideo, lambda x: not x)
bool_note(' Reference audio', c.ReferenceAudio, lambda x: not x)
bool_note(' Reference subtitle', c.ReferenceSubtitle, lambda x: not x)