ignore the unknown flv tag.

@@ -127,6 +127,12 @@ int proxy(srs_rtmp_t irtmp, srs_rtmp_t ortmp)
             return ret;
         }
         
+        if (!srs_utils_flv_tag_is_ok(type)) {
+            srs_human_trace("ignore invalid flv tag=%d, dts=%d, %d bytes", type, timestamp, size);
+            free(data);
+            continue;
+        }
+        
         if ((ret = srs_human_print_rtmp_packet(type, timestamp, data, size)) != 0) {
             srs_human_trace("print packet failed. ret=%d", ret);
             return ret;

@@ -1974,6 +1974,11 @@ int srs_utils_parse_timestamp(
     return ret;
 }
     
+srs_bool srs_utils_flv_tag_is_ok(char type)
+{
+    return type == SRS_RTMP_TYPE_AUDIO || type == SRS_RTMP_TYPE_VIDEO || type == SRS_RTMP_TYPE_SCRIPT;
+}
+
 char srs_utils_flv_video_codec_id(char* data, int size)
 {
     if (size < 1) {

@@ -657,6 +657,12 @@ extern int srs_utils_parse_timestamp(
 );
     
 /**
+ * whether the flv tag specified by param type is ok.
+ * @return true when tag is video/audio/script-data; otherwise, false.
+ */
+extern srs_bool srs_utils_flv_tag_is_ok(char type);
+
+/**
 * get the CodecID of video tag.
 * Codec Identifier. The following values are defined:
 *           2 = Sorenson H.263