shared_ptr<DCPSubtitleDecoder> decoder (new DCPSubtitleDecoder (content, film->log()));
stored = optional<ContentTextSubtitle> ();
while (!decoder->pass ()) {
shared_ptr<DCPSubtitleDecoder> decoder (new DCPSubtitleDecoder (content, film->log()));
stored = optional<ContentTextSubtitle> ();
while (!decoder->pass ()) {