add debug message

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)
 }
 

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}
 }