diff --git a/DONATIONS.txt b/DONATIONS.txt
index 63f04960d..582b3dd64 100644
--- a/DONATIONS.txt
+++ b/DONATIONS.txt
@@ -15,6 +15,7 @@ RMB 500-999
 * [2015-04-11 12:48] 丁一
 
 RMB 100-499
+* [2015-05-07 23:56] 余世兵
 * [2015-05-07 11:34] 王隆萼
 * [2015-05-06 22:04] 姜庆东
 * [2015-04-10 19:52] 阳成飞
diff --git a/trunk/research/librtmp/srs_rtmp_dump.c b/trunk/research/librtmp/srs_rtmp_dump.c
index b1cd6a3b3..1fbab4821 100644
--- a/trunk/research/librtmp/srs_rtmp_dump.c
+++ b/trunk/research/librtmp/srs_rtmp_dump.c
@@ -256,6 +256,7 @@ int main(int argc, char** argv)
         }
     }
     
+    u_int32_t pre_timestamp = 0;
     for (;;) {
         int size;
         char type;
@@ -267,10 +268,11 @@ int main(int argc, char** argv)
             goto rtmp_destroy;
         }
         
-        if (srs_human_print_rtmp_packet(type, timestamp, data, size) != 0) {
+        if (srs_human_print_rtmp_packet2(type, timestamp, data, size, pre_timestamp) != 0) {
             srs_human_trace("print rtmp packet failed.");
             goto rtmp_destroy;
         }
+        pre_timestamp = timestamp;
         
         // we only write some types of messages to flv file.
         int is_flv_msg = type == SRS_RTMP_TYPE_AUDIO
diff --git a/trunk/src/libs/srs_librtmp.cpp b/trunk/src/libs/srs_librtmp.cpp
index 4b3bb4215..65751d502 100644
--- a/trunk/src/libs/srs_librtmp.cpp
+++ b/trunk/src/libs/srs_librtmp.cpp
@@ -2313,29 +2313,39 @@ const char* srs_human_flv_audio_aac_packet_type2string(char aac_packet_type)
     
     return unknown;
 }
-
+    
 int srs_human_print_rtmp_packet(char type, u_int32_t timestamp, char* data, int size)
+{
+    return srs_human_print_rtmp_packet2(type, timestamp, data, size, 0);
+}
+
+int srs_human_print_rtmp_packet2(char type, u_int32_t timestamp, char* data, int size, u_int32_t pre_timestamp)
 {
     int ret = ERROR_SUCCESS;
     
+    int diff = 0;
+    if (pre_timestamp > 0) {
+        diff = (int)timestamp - (int)pre_timestamp;
+    }
+    
     u_int32_t pts;
     if (srs_utils_parse_timestamp(timestamp, type, data, size, &pts) != 0) {
-        srs_human_trace("Rtmp packet type=%s, dts=%d, size=%d, DecodeError", 
-            srs_human_flv_tag_type2string(type), timestamp, size
+        srs_human_trace("Rtmp packet type=%s, dts=%d, diff=%d, size=%d, DecodeError",
+            srs_human_flv_tag_type2string(type), timestamp, diff, size
         );
         return ret;
     }
     
     if (type == SRS_RTMP_TYPE_VIDEO) {
-        srs_human_trace("Video packet type=%s, dts=%d, pts=%d, size=%d, %s(%s,%s)", 
-            srs_human_flv_tag_type2string(type), timestamp, pts, size,
+        srs_human_trace("Video packet type=%s, dts=%d, pts=%d, diff=%d, size=%d, %s(%s,%s)",
+            srs_human_flv_tag_type2string(type), timestamp, pts, diff, size,
             srs_human_flv_video_codec_id2string(srs_utils_flv_video_codec_id(data, size)),
             srs_human_flv_video_avc_packet_type2string(srs_utils_flv_video_avc_packet_type(data, size)),
             srs_human_flv_video_frame_type2string(srs_utils_flv_video_frame_type(data, size))
         );
     } else if (type == SRS_RTMP_TYPE_AUDIO) {
-        srs_human_trace("Audio packet type=%s, dts=%d, pts=%d, size=%d, %s(%s,%s,%s,%s)", 
-            srs_human_flv_tag_type2string(type), timestamp, pts, size,
+        srs_human_trace("Audio packet type=%s, dts=%d, pts=%d, diff=%d, size=%d, %s(%s,%s,%s,%s)",
+            srs_human_flv_tag_type2string(type), timestamp, pts, diff, size,
             srs_human_flv_audio_sound_format2string(srs_utils_flv_audio_sound_format(data, size)),
             srs_human_flv_audio_sound_rate2string(srs_utils_flv_audio_sound_rate(data, size)),
             srs_human_flv_audio_sound_size2string(srs_utils_flv_audio_sound_size(data, size)),
@@ -2343,8 +2353,8 @@ int srs_human_print_rtmp_packet(char type, u_int32_t timestamp, char* data, int
             srs_human_flv_audio_aac_packet_type2string(srs_utils_flv_audio_aac_packet_type(data, size))
         );
     } else if (type == SRS_RTMP_TYPE_SCRIPT) {
-        srs_human_verbose("Data packet type=%s, time=%d, size=%d", 
-        srs_human_flv_tag_type2string(type), timestamp, size);
+        srs_human_verbose("Data packet type=%s, time=%d, diff=%d, size=%d",
+        srs_human_flv_tag_type2string(type), timestamp, diff, size);
         int nparsed = 0;
         while (nparsed < size) {
             int nb_parsed_this = 0;
@@ -2360,8 +2370,8 @@ int srs_human_print_rtmp_packet(char type, u_int32_t timestamp, char* data, int
             srs_freep(amf0_str);
         }
     } else {
-        srs_human_trace("Rtmp packet type=%#x, dts=%d, pts=%d, size=%d", 
-            type, timestamp, pts, size);
+        srs_human_trace("Rtmp packet type=%#x, dts=%d, pts=%d, diff=%d, size=%d",
+            type, timestamp, pts, diff, size);
     }
     
     return ret;
diff --git a/trunk/src/libs/srs_librtmp.hpp b/trunk/src/libs/srs_librtmp.hpp
index 7fb10f2f0..67eb77b82 100644
--- a/trunk/src/libs/srs_librtmp.hpp
+++ b/trunk/src/libs/srs_librtmp.hpp
@@ -901,8 +901,9 @@ extern const char* srs_human_flv_audio_aac_packet_type2string(char aac_packet_ty
 * print the rtmp packet, use srs_human_trace/srs_human_verbose for packet,
 * and use srs_human_raw for script data body.
 * @return an error code for parse the timetstamp to dts and pts.
-*/
+ */
 extern int srs_human_print_rtmp_packet(char type, u_int32_t timestamp, char* data, int size);
+extern int srs_human_print_rtmp_packet2(char type, u_int32_t timestamp, char* data, int size, u_int32_t pre_timestamp);
 
 // log to console, for use srs-librtmp application.
 extern const char* srs_human_format_time();