save hls header of total.m3u8 when total.m3u8 no content,last version save header when seq no is 0.

@@ -844,17 +844,17 @@ int SrsHlsMuxer::segment_close(string log_desc)
 			//add segment to total.m3u8
 			std::stringstream ss;
 
-			if (currentSeg->sequence_no == 0) {
-				ret = total_m3u8_writer.open(total_m3u8);
-				if (ret != ERROR_SUCCESS) {
-					srs_error(
-							"open total file %s error:%s reap ts segment, sequence_no=%d, uri=%s, duration=%.2f, start=%"PRId64,
-							total_m3u8.c_str(), log_desc.c_str(),
-							currentSeg->sequence_no, currentSeg->uri.c_str(),
-							currentSeg->duration,
-							currentSeg->segment_start_dts);
-					return ret;
-				}
+			ret = total_m3u8_writer.open_write(total_m3u8);
+			if (ret != ERROR_SUCCESS) {
+				srs_error(
+						"open total file %s error:%s reap ts segment, sequence_no=%d, uri=%s, duration=%.2f, start=%"PRId64,
+						total_m3u8.c_str(), log_desc.c_str(),
+						currentSeg->sequence_no, currentSeg->uri.c_str(),
+						currentSeg->duration, currentSeg->segment_start_dts);
+				return ret;
+			}
+
+			if (!total_m3u8_writer.tellg()) {
 				//write total m3u8  header
 
 				ss << "#EXTM3U" << SRS_CONSTS_LF << "#EXT-X-VERSION:3"
@@ -866,20 +866,10 @@ int SrsHlsMuxer::segment_close(string log_desc)
 				ss << "#EXT-X-TARGETDURATION:" << "6000" << SRS_CONSTS_LF;
 
 				srs_verbose("write m3u8 header success.");
-
-			} else {
-				ret = total_m3u8_writer.open_write(total_m3u8);
-				if (ret != ERROR_SUCCESS) {
-					srs_error(
-							"open total file %s error:%s reap ts segment, sequence_no=%d, uri=%s, duration=%.2f, start=%"PRId64,
-							total_m3u8.c_str(), log_desc.c_str(),
-							currentSeg->sequence_no, currentSeg->uri.c_str(),
-							currentSeg->duration,
-							currentSeg->segment_start_dts);
-					return ret;
-				}
+				m3u8_total_endlist_saved = false;
 			}
 
+
 			bool erase_last_endlist = false;
 
 			if (currentSeg->is_sequence_header) {