refine log, add overflow log

@@ -298,8 +298,8 @@ int SrsRtmpConn::stream_service_cycle()
     }
     
     bool enabled_cache = _srs_config->get_gop_cache(req->vhost);
-    srs_trace("source found, url=%s, enabled_cache=%d, edge=%d", 
-        req->get_stream_url().c_str(), enabled_cache, vhost_is_edge);
+    srs_trace("source found, ip=%s, url=%s, enabled_cache=%d, edge=%d", 
+        ip, req->get_stream_url().c_str(), enabled_cache, vhost_is_edge);
     source->set_cache(enabled_cache);
     
     switch (type) {

@@ -1157,6 +1157,9 @@ int SrsProtocol::read_message_header(SrsChunkStream* chunk, char fmt, int bh_siz
     //        milliseconds.
     // in a word, 31bits timestamp is ok.
     // convert extended timestamp to 31bits.
+    if (chunk->header.timestamp > 0x7fffffff) {
+        srs_warn("RTMP 31bits timestamp overflow, time=%"PRId64, chunk->header.timestamp);
+    }
     chunk->header.timestamp &= 0x7fffffff;
     
     // valid message