shared_ptr<const SubRipContent> sc = boost::dynamic_pointer_cast<const SubRipContent> (*i);
shared_ptr<const DCPSubtitleContent> dsc = boost::dynamic_pointer_cast<const DCPSubtitleContent> (*i);
if (fc) {
shared_ptr<const SubRipContent> sc = boost::dynamic_pointer_cast<const SubRipContent> (*i);
shared_ptr<const DCPSubtitleContent> dsc = boost::dynamic_pointer_cast<const DCPSubtitleContent> (*i);
if (fc) {