diff --git a/trunk/src/kernel/srs_kernel_mp4.cpp b/trunk/src/kernel/srs_kernel_mp4.cpp
index 6cb93ffc66..fed0541b50 100644
--- a/trunk/src/kernel/srs_kernel_mp4.cpp
+++ b/trunk/src/kernel/srs_kernel_mp4.cpp
@@ -3319,6 +3319,9 @@ int SrsMp4SampleManager::load_trak(map<uint64_t, SrsMp4Sample*>& tses, SrsCodecF
     
     // For each chunk offset.
     for (uint32_t ci = 0; ci < stco->entry_count; ci++) {
+        // The sample offset relative in chunk.
+        uint32_t sample_relative_offset = 0;
+        
         // Find how many samples from stsc.
         SrsMp4StscEntry* stsc_entry = stsc->on_chunk(ci);
         for (uint32_t i = 0; i < stsc_entry->samples_per_chunk; i++) {
@@ -3326,12 +3329,13 @@ int SrsMp4SampleManager::load_trak(map<uint64_t, SrsMp4Sample*>& tses, SrsCodecF
             sample->type = tt;
             sample->index = (previous? previous->index+1:0);
             sample->tbn = mdhd->timescale;
+            sample->offset = stco->entries[ci] + sample_relative_offset;
             
             uint32_t sample_size = 0;
             if ((ret = stsz->get_sample_size(sample->index, &sample_size)) != ERROR_SUCCESS) {
                 return ret;
             }
-            sample->offset = stco->entries[ci] + sample_size * i;
+            sample_relative_offset += sample_size;
             
             SrsMp4SttsEntry* stts_entry = NULL;
             if ((ret = stts->on_sample(sample->index, &stts_entry)) != ERROR_SUCCESS) {
diff --git a/trunk/src/libs/srs_librtmp.cpp b/trunk/src/libs/srs_librtmp.cpp
index c5452ea08c..173f807c2e 100644
--- a/trunk/src/libs/srs_librtmp.cpp
+++ b/trunk/src/libs/srs_librtmp.cpp
@@ -2602,33 +2602,44 @@ int srs_human_print_rtmp_packet4(char type, uint32_t timestamp, char* data, int
         ndiff = (int)(srs_utils_time_ms() - pre_now);
     }
     
+    char sbytes[40];
+    if (true) {
+        int nb = srs_min(8, size);
+        int p = 0;
+        for (int i = 0; i < nb; i++) {
+            p += snprintf(sbytes+p, 40-p, "0x%02x ", (uint8_t)data[i]);
+        }
+    }
+    
     uint32_t pts;
     if (srs_utils_parse_timestamp(timestamp, type, data, size, &pts) != 0) {
-        srs_human_trace("Rtmp packet id=%"PRId64"/%.1f/%.1f, type=%s, dts=%d, ndiff=%d, diff=%d, size=%d, DecodeError",
-            nb_packets, pi, gfps, srs_human_flv_tag_type2string(type), timestamp, ndiff, diff, size
+        srs_human_trace("Rtmp packet id=%"PRId64"/%.1f/%.1f, type=%s, dts=%d, ndiff=%d, diff=%d, size=%d, DecodeError, (%s)",
+            nb_packets, pi, gfps, srs_human_flv_tag_type2string(type), timestamp, ndiff, diff, size, sbytes
         );
         return ret;
     }
     
     if (type == SRS_RTMP_TYPE_VIDEO) {
-        srs_human_trace("Video packet id=%"PRId64"/%.1f/%.1f, type=%s, dts=%d, pts=%d, ndiff=%d, diff=%d, size=%d, %s(%s,%s)",
+        srs_human_trace("Video packet id=%"PRId64"/%.1f/%.1f, type=%s, dts=%d, pts=%d, ndiff=%d, diff=%d, size=%d, %s(%s,%s), (%s)",
             nb_packets, pi, gfps, srs_human_flv_tag_type2string(type), timestamp, pts, ndiff, 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))
+            srs_human_flv_video_frame_type2string(srs_utils_flv_video_frame_type(data, size)),
+            sbytes
         );
     } else if (type == SRS_RTMP_TYPE_AUDIO) {
-        srs_human_trace("Audio packet id=%"PRId64"/%.1f/%.1f, type=%s, dts=%d, pts=%d, ndiff=%d, diff=%d, size=%d, %s(%s,%s,%s,%s)",
+        srs_human_trace("Audio packet id=%"PRId64"/%.1f/%.1f, type=%s, dts=%d, pts=%d, ndiff=%d, diff=%d, size=%d, %s(%s,%s,%s,%s), (%s)",
             nb_packets, pi, gfps, srs_human_flv_tag_type2string(type), timestamp, pts, ndiff, 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)),
             srs_human_flv_audio_sound_type2string(srs_utils_flv_audio_sound_type(data, size)),
-            srs_human_flv_audio_aac_packet_type2string(srs_utils_flv_audio_aac_packet_type(data, size))
+            srs_human_flv_audio_aac_packet_type2string(srs_utils_flv_audio_aac_packet_type(data, size)),
+            sbytes
         );
     } else if (type == SRS_RTMP_TYPE_SCRIPT) {
-        srs_human_trace("Data packet id=%"PRId64"/%.1f/%.1f, type=%s, time=%d, ndiff=%d, diff=%d, size=%d",
-            nb_packets, pi, gfps, srs_human_flv_tag_type2string(type), timestamp, ndiff, diff, size);
+        srs_human_trace("Data packet id=%"PRId64"/%.1f/%.1f, type=%s, time=%d, ndiff=%d, diff=%d, size=%d, (%s)",
+            nb_packets, pi, gfps, srs_human_flv_tag_type2string(type), timestamp, ndiff, diff, size, sbytes);
         int nparsed = 0;
         while (nparsed < size) {
             int nb_parsed_this = 0;
@@ -2644,8 +2655,8 @@ int srs_human_print_rtmp_packet4(char type, uint32_t timestamp, char* data, int
             srs_freepa(amf0_str);
         }
     } else {
-        srs_human_trace("Rtmp packet id=%"PRId64"/%.1f/%.1f, type=%#x, dts=%d, pts=%d, ndiff=%d, diff=%d, size=%d",
-            nb_packets, pi, gfps, type, timestamp, pts, ndiff, diff, size);
+        srs_human_trace("Rtmp packet id=%"PRId64"/%.1f/%.1f, type=%#x, dts=%d, pts=%d, ndiff=%d, diff=%d, size=%d, (%s)",
+            nb_packets, pi, gfps, type, timestamp, pts, ndiff, diff, size, sbytes);
     }
     
     return ret;