for (auto i = 0; i < 2; ++i) {
auto content = make_shared<StringTextFileContent>("test/data/subrip2.srt");
content->only_text()->set_use (true);
content->only_text()->set_burn (false);
for (auto i = 0; i < 2; ++i) {
auto content = make_shared<StringTextFileContent>("test/data/subrip2.srt");
content->only_text()->set_use (true);
content->only_text()->set_burn (false);