dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
fread (&info.offset, sizeof (info.offset), 1, file);
fread (&info.size, sizeof (info.size), 1, file);
dcpomatic_fseek (file, frame_info_position (frame, eyes), SEEK_SET);
fread (&info.offset, sizeof (info.offset), 1, file);
fread (&info.size, sizeof (info.size), 1, file);