diff --git a/cgo/ffmpeg/audio.go b/cgo/ffmpeg/audio.go
index 8ba9baf..0e02934 100644
--- a/cgo/ffmpeg/audio.go
+++ b/cgo/ffmpeg/audio.go
@@ -17,6 +17,7 @@ import (
 	"fmt"
 	"time"
 	"github.com/nareix/joy4/av"
+	"github.com/nareix/joy4/av/avutil"
 	"github.com/nareix/joy4/codec/aacparser"
 )
 
@@ -277,11 +278,7 @@ func (self *AudioEncoder) Setup() (err error) {
 	return
 }
 
-func (self *AudioEncoder) CodecData() (codec av.AudioCodecData) {
-	return self.codecData
-}
-
-func (self *AudioEncoder) encodeOne(frame av.AudioFrame) (gotpkt bool, pkt []byte, err error) {
+func (self *AudioEncoder) prepare() (err error) {
 	ff := &self.ff.ff
 
 	if ff.frame == nil {
@@ -290,6 +287,20 @@ func (self *AudioEncoder) encodeOne(frame av.AudioFrame) (gotpkt bool, pkt []byt
 		}
 	}
 
+	return
+}
+
+func (self *AudioEncoder) CodecData() (codec av.AudioCodecData) {
+	return self.codecData
+}
+
+func (self *AudioEncoder) encodeOne(frame av.AudioFrame) (gotpkt bool, pkt []byte, err error) {
+	if err = self.prepare(); err != nil {
+		return
+	}
+
+	ff := &self.ff.ff
+
 	cpkt := C.AVPacket{}
 	cgotpkt := C.int(0)
 	audioFrameAssignToFF(frame, ff.frame)
@@ -670,3 +681,12 @@ func (self audioCodecData) PacketDuration(data []byte) (dur time.Duration, err e
 	return
 }
 
+func AudioCodecHandler(h *avutil.RegisterHandler) {
+	h.AudioDecoder = func(codec av.AudioCodecData) (av.AudioDecoder, error) {
+		return NewAudioDecoder(codec)
+	}
+	h.AudioEncoder = func(typ av.CodecType) (av.AudioEncoder, error) {
+		return NewAudioEncoderByCodecType(typ)
+	}
+}
+