diff --git a/av/avutil/avutil.go b/av/avutil/avutil.go
index 6e5cb5d..c1f5f04 100644
--- a/av/avutil/avutil.go
+++ b/av/avutil/avutil.go
@@ -10,6 +10,7 @@ import (
 	"strings"
 
 	"gitlab.com/ics_cinnamon/joy4/av"
+	"gitlab.com/ics_cinnamon/joy4/util"
 )
 
 type HandlerDemuxer struct {
@@ -126,6 +127,8 @@ func (self *Handlers) NewAudioDecoder(codec av.AudioCodecData) (dec av.AudioDeco
 }
 
 func (self *Handlers) Open(uri string) (demuxer av.DemuxCloser, err error) {
+	util.PrintCallTrace(0)
+
 	listen := false
 	if strings.HasPrefix(uri, "listen:") {
 		uri = uri[len("listen:"):]
@@ -270,6 +273,7 @@ var DefaultHandlers = &Handlers{}
 
 func Open(url string) (demuxer av.DemuxCloser, err error) {
 	fmt.Println("avutil Open!")
+	util.PrintCallTrace(1)
 	return DefaultHandlers.Open(url)
 }
 
diff --git a/format/format.go b/format/format.go
index 50795b1..85bdb9a 100644
--- a/format/format.go
+++ b/format/format.go
@@ -1,20 +1,19 @@
 package format
 
 import (
+	"fmt"
+
 	"gitlab.com/ics_cinnamon/joy4/av/avutil"
 	"gitlab.com/ics_cinnamon/joy4/format/aac"
-	"gitlab.com/ics_cinnamon/joy4/format/flv"
-	"gitlab.com/ics_cinnamon/joy4/format/mp4"
-	"gitlab.com/ics_cinnamon/joy4/format/rtmp"
-	"gitlab.com/ics_cinnamon/joy4/format/rtsp"
-	"gitlab.com/ics_cinnamon/joy4/format/ts"
 )
 
 func RegisterAll() {
-	avutil.DefaultHandlers.Add(mp4.Handler)
-	avutil.DefaultHandlers.Add(ts.Handler)
-	avutil.DefaultHandlers.Add(rtmp.Handler)
-	avutil.DefaultHandlers.Add(rtsp.Handler)
-	avutil.DefaultHandlers.Add(flv.Handler)
+	//avutil.DefaultHandlers.Add(mp4.Handler)
+	//avutil.DefaultHandlers.Add(ts.Handler)
+	//avutil.DefaultHandlers.Add(rtmp.Handler)
+	//avutil.DefaultHandlers.Add(rtsp.Handler)
+	//avutil.DefaultHandlers.Add(flv.Handler)
 	avutil.DefaultHandlers.Add(aac.Handler)
+
+	fmt.Println("Handler Regi Done!")
 }
diff --git a/util/util.go b/util/util.go
new file mode 100644
index 0000000..ef7e19b
--- /dev/null
+++ b/util/util.go
@@ -0,0 +1,13 @@
+package util
+
+import (
+	"fmt"
+	"runtime"
+)
+
+func PrintCallTrace(depth int) {
+	funcname, file, line, ok := runtime.Caller(depth)
+	if ok {
+		fmt.Printf("[%s:%d %s]\n", file, line, runtime.FuncForPC(funcname).Name())
+	}
+}