AVPacket *sub;constint64_tpos = ff_text_pos(&tr) - (c !=0);intn = ff_smil_extract_next_text_chunk(&tr, &buf, &c);if(n ==0)break;if(!av_strncasecmp(buf.str,"<window",7)) {/* save header to extradata */constchar*p = ff_smil_get_attr_ptr(buf.str,"duration");if(p)...