diff --git a/src/Rtmp/RtmpProtocol.cpp b/src/Rtmp/RtmpProtocol.cpp
index 800f0c9d..f98468bf 100644
--- a/src/Rtmp/RtmpProtocol.cpp
+++ b/src/Rtmp/RtmpProtocol.cpp
@@ -622,17 +622,17 @@ const char* RtmpProtocol::handle_rtmp(const char *data, size_t len) {
         }
         auto &chunk_data = *now_packet;
         chunk_data.chunk_id = _now_chunk_id;
-        switch (header->fmt) {
-            case 0:
+        switch (header_len) {
+            case 12:
                 chunk_data.is_abs_stamp = true;
                 chunk_data.stream_index = load_le32(header->stream_index);
                 _last_stream_index = chunk_data.stream_index;
-            case 1:
+            case 8:
                 chunk_data.body_size = load_be24(header->body_size);
                 chunk_data.type_id = header->type_id;
                 _last_body_size = chunk_data.body_size;
                 _last_type_id = chunk_data.type_id;
-            case 2:
+            case 4:
                 chunk_data.ts_field = load_be24(header->time_stamp);
         }
         switch (header->fmt) {