diff --git a/client.go b/client.go
index 00a385a..581ec23 100644
--- a/client.go
+++ b/client.go
@@ -9,7 +9,7 @@ import (
 	"encoding/hex"
 	"fmt"
 	"github.com/nareix/av"
-	"github.com/nareix/av/pktqueue"
+	"github.com/nareix/av/pktque"
 	"github.com/nareix/codec"
 	"github.com/nareix/codec/aacparser"
 	"github.com/nareix/codec/h264parser"
@@ -50,9 +50,10 @@ type Client struct {
 	requestUri string
 	cseq       uint
 	streams    []*Stream
+	streamsintf []av.CodecData
 	session    string
 	body       io.Reader
-	pktque     *pktqueue.Queue
+	corrector *pktque.TimeCorrector
 }
 
 type Request struct {
@@ -108,9 +109,7 @@ func Dial(uri string) (self *Client, err error) {
 
 func (self *Client) Streams() (streams []av.CodecData, err error) {
 	if self.setupCalled {
-		for _, i := range self.setupIdx {
-			streams = append(streams, self.streams[i].CodecData)
-		}
+		streams = self.streamsintf
 	} else {
 		err = fmt.Errorf("rtsp: no streams")
 		return
@@ -409,6 +408,7 @@ func (self *Client) Setup(idx []int) (err error) {
 			return
 		}
 	}
+	self.initstructs()
 
 	self.setupCalled = true
 	return
@@ -419,6 +419,14 @@ func md5hash(s string) string {
 	return hex.EncodeToString(h[:])
 }
 
+func (self *Client) initstructs() {
+	self.streamsintf = make([]av.CodecData, len(self.setupIdx))
+	for i := range self.setupIdx {
+		self.streamsintf[i] = self.streams[self.setupIdx[i]].CodecData
+	}
+	self.corrector = pktque.NewTimeCorrector(self.streamsintf)
+}
+
 func (self *Client) Describe() (streams []av.CodecData, err error) {
 	var res Response
 
@@ -449,9 +457,9 @@ func (self *Client) Describe() (streams []av.CodecData, err error) {
 		fmt.Println("<", body)
 	}
 
-	self.streams = []*Stream{}
 	_, medias := sdp.Parse(body)
 
+	self.streams = []*Stream{}
 	for _, media := range medias {
 		stream := &Stream{Sdp: media, client: self}
 		if err = stream.makeCodecData(); err != nil {
@@ -459,14 +467,9 @@ func (self *Client) Describe() (streams []av.CodecData, err error) {
 		}
 		self.streams = append(self.streams, stream)
 	}
-
 	for _, stream := range self.streams {
 		streams = append(streams, stream)
 	}
-	self.pktque = &pktqueue.Queue{
-		Poll: self.poll,
-	}
-	self.pktque.Alloc(streams)
 
 	return
 }
@@ -506,6 +509,7 @@ func (self *Client) HandleCodecDataChange() (_newcli *Client, err error) {
 		}
 		newcli.streams = append(newcli.streams, newstream)
 	}
+	newcli.initstructs()
 
 	_newcli = newcli
 	return
@@ -923,7 +927,18 @@ func (self *Client) Close() (err error) {
 	return self.conn.Conn.Close()
 }
 
-func (self *Client) poll() (err error) {
+func (self *Client) ReadPacket() (pkt av.Packet, err error) {
+	if !self.setupCalled {
+		if err = self.setupAll(); err != nil {
+			return
+		}
+	}
+	if !self.playCalled {
+		if err = self.Play(); err != nil {
+			return
+		}
+	}
+
 	for {
 		var res Response
 		if res, err = self.ReadResponse(); err != nil {
@@ -946,32 +961,22 @@ func (self *Client) poll() (err error) {
 					timeScale = 16000
 				}
 
-				tm := time.Duration(stream.timestamp)*time.Second / time.Duration(timeScale)
+				pkt = stream.pkt
+				pkt.Time = time.Duration(stream.timestamp)*time.Second / time.Duration(timeScale)
 				if false {
-					fmt.Printf("rtsp: #%d %d/%d %d\n", i, stream.timestamp, timeScale, len(stream.pkt.Data))
+					fmt.Printf("rtsp: #%d %d/%d %d\n", i, stream.timestamp, timeScale, len(pkt.Data))
 				}
-				self.pktque.WriteTimePacket(self.setupMap[i], tm, stream.pkt)
+				pkt.Idx = int8(self.setupMap[i])
+				self.corrector.Correct(&pkt)
+
 				stream.pkt = av.Packet{}
 				stream.gotpkt = false
 				return
 			}
 		}
 	}
-	return
-}
 
-func (self *Client) ReadPacket() (i int, pkt av.Packet, err error) {
-	if !self.setupCalled {
-		if err = self.setupAll(); err != nil {
-			return
-		}
-	}
-	if !self.playCalled {
-		if err = self.Play(); err != nil {
-			return
-		}
-	}
-	return self.pktque.ReadPacket()
+	return
 }
 
 func (self *Client) ReadHeader() (err error) {