single = make_shared<DCPSubtitleContent>(path);
} else if (ext == ".mxf" && VideoMXFContent::valid_mxf(path)) {
single = make_shared<VideoMXFContent>(path);
single = make_shared<DCPSubtitleContent>(path);
} else if (ext == ".mxf" && VideoMXFContent::valid_mxf(path)) {
single = make_shared<VideoMXFContent>(path);