diff --git a/trunk/src/core/srs_core_source.cpp b/trunk/src/core/srs_core_source.cpp
index 8dc7f30b5..146c99938 100755
--- a/trunk/src/core/srs_core_source.cpp
+++ b/trunk/src/core/srs_core_source.cpp
@@ -469,6 +469,7 @@ void SrsSource::on_unpublish()
 	clear_gop_cache();
 
 	srs_freep(cache_metadata);
+	video_frame_rate = audio_sample_rate = 0;
 	
 	srs_freep(cache_sh_video);
 	srs_freep(cache_sh_audio);