diff --git a/trunk/research/ts_info.cc b/trunk/research/ts_info.cc
index 747c5e6fd..eab6fbe96 100644
--- a/trunk/research/ts_info.cc
+++ b/trunk/research/ts_info.cc
@@ -1269,7 +1269,7 @@ int64_t TSPayloadPES::decode_33bits_int(int64_t& temp)
 	// marker_bit 1bit
 	temp = temp >> 1;
 	// PTS [14..0] 15bits
-	ret |= temp & 0x3fff;
+	ret |= temp & 0x7fff;
 	// marker_bit 1bit
 	temp = temp >> 1;
 	// PTS [29..15] 15bits, 15zero, 29-15+1one
diff --git a/trunk/src/core/srs_core_hls.cpp b/trunk/src/core/srs_core_hls.cpp
index ca58451ad..e9665e214 100644
--- a/trunk/src/core/srs_core_hls.cpp
+++ b/trunk/src/core/srs_core_hls.cpp
@@ -277,7 +277,8 @@ u_int8_t mpegts_header[] = {
     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
 };
 
-// @see: NGX_RTMP_HLS_DELAY, 700ms, ts_tbn=90000
+// @see: NGX_RTMP_HLS_DELAY, 
+// 63000: 700ms, ts_tbn=90000
 #define SRS_HLS_DELAY 63000
 
 // @see: ngx_rtmp_mpegts.c
@@ -645,7 +646,7 @@ int SrsTSMuxer::write_video(u_int32_t time, SrsCodec* codec, SrsCodecSample* sam
 			return ret;
 		}
 		
-		if (video_frame.key && !sps_pps_sent) {
+		if (false && video_frame.key && !sps_pps_sent) {
 			// sample start prefix
 			video_buffer->append(aud_nal, 4);
 			// sps and pps