diff --git a/av/av.go b/av/av.go
index ef301db..591893d 100644
--- a/av/av.go
+++ b/av/av.go
@@ -121,7 +121,7 @@ var (
 	PCM_ALAW   = MakeAudioCodecType(avCodecTypeMagic + 3)
 	SPEEX      = MakeAudioCodecType(avCodecTypeMagic + 4)
 	NELLYMOSER = MakeAudioCodecType(avCodecTypeMagic + 5)
-	G729= MakeAudioCodecType(avCodecTypeMagic + 6)
+	G729       = MakeAudioCodecType(avCodecTypeMagic + 6)
 )
 
 const codecTypeAudioBit = 0x1
diff --git a/av/avutil/avutil.go b/av/avutil/avutil.go
index 5295238..6e5cb5d 100644
--- a/av/avutil/avutil.go
+++ b/av/avutil/avutil.go
@@ -269,6 +269,7 @@ func (self *Handlers) FindCreate(uri string) (handler RegisterHandler, muxer av.
 var DefaultHandlers = &Handlers{}
 
 func Open(url string) (demuxer av.DemuxCloser, err error) {
+	fmt.Println("avutil Open!")
 	return DefaultHandlers.Open(url)
 }
 
diff --git a/format/aac/aac.go b/format/aac/aac.go
index 905e371..cea04d5 100644
--- a/format/aac/aac.go
+++ b/format/aac/aac.go
@@ -120,5 +120,7 @@ func Handler(h *avutil.RegisterHandler) {
 		return err == nil
 	}
 
+	fmt.Println("AAC handler!")
+
 	h.CodecTypes = []av.CodecType{av.AAC}
 }