diff --git a/audio_track.go b/audio_track.go
index ae47230..f6e788a 100644
--- a/audio_track.go
+++ b/audio_track.go
@@ -1,8 +1,6 @@
 package engine
 
 import (
-	"bytes"
-	"context"
 
 	"github.com/Monibuca/utils/v3/codec"
 )
@@ -105,9 +103,6 @@ func (at *AudioTrack) pushRaw(ts uint32, payload []byte) {
 			pack.Payload = pack.Bytes()
 		}
 	}
-	at.Do(func(v interface{}) {
-		v.(*RingItem).Value.(*AudioPack).Buffer = bytes.NewBuffer([]byte{})
-	})
 	at.PushRaw = func(ts uint32, payload []byte) {
 		pack := at.CurrentValue().(*AudioPack)
 		pack.Timestamp = ts
@@ -142,7 +137,7 @@ func (s *Stream) NewAudioTrack(codec byte) (at *AudioTrack) {
 	at.PushByteStream = at.pushByteStream
 	at.PushRaw = at.pushRaw
 	at.Stream = s
-	at.Init(8)
+	at.Init(256)
 	at.Do(func(v interface{}) {
 		v.(*RingItem).Value = new(AudioPack)
 	})
@@ -174,19 +169,14 @@ func (at *AudioTrack) SetASC(asc []byte) {
 	at.Stream.AudioTracks.AddTrack("aac", at)
 }
 
-func (at *AudioTrack) Play(ctx context.Context, onAudio func(AudioPack)) {
-	streamExit := at.Stream.Context.Done()
+func (at *AudioTrack) Play(onAudio func(AudioPack), exit1, exit2 <-chan struct{}) {
 	ar := at.Clone()
 	ap := ar.Read().(*AudioPack)
-	var extraExit <-chan struct{}
-	if ctx != nil {
-		extraExit = ctx.Done()
-	}
 	for startTimestamp := ap.Timestamp; at.Goon(); ap = ar.Read().(*AudioPack) {
 		select {
-		case <-extraExit:
+		case <-exit1:
 			return
-		case <-streamExit:
+		case <-exit2:
 			return
 		default:
 			onAudio(ap.Copy(startTimestamp))
diff --git a/base_track.go b/base_track.go
index b04d991..a0912b1 100644
--- a/base_track.go
+++ b/base_track.go
@@ -21,7 +21,7 @@ type AVPack interface {
 type BasePack struct {
 	Timestamp uint32
 	Sequence  int
-	*bytes.Buffer
+	bytes.Buffer
 	Payload []byte
 }
 
diff --git a/rtp.go b/rtp.go
index 6034895..54ba1c3 100644
--- a/rtp.go
+++ b/rtp.go
@@ -1,8 +1,7 @@
 package engine
 
 import (
-	"sort"
-
+	"github.com/Monibuca/utils/v3"
 	"github.com/Monibuca/utils/v3/codec"
 	"github.com/pion/rtp"
 )
@@ -49,68 +48,124 @@ func (v *RTPVideo) push(payload []byte) {
 	if err := v.Unmarshal(payload); err != nil {
 		return
 	}
+	var p *VideoPack
 	t0 := v.Timestamp
+	tmpVT := v.Stream.NewVideoTrack(0)
+	tmpVT.ExtraData = v.ExtraData
+	tmpVT.CodecID = v.CodecID
+	start := tmpVT.Ring
+	tmpVT.PushNalu(0, 0, v.Payload)
 	v.Push = func(payload []byte) {
 		if err := v.Unmarshal(payload); err != nil {
 			return
 		}
-		t1 := (v.Timestamp - t0)/90
-		if t1 < vt.Prev().Value.(*RingItem).Value.(*VideoPack).Timestamp {
-			if vt.WaitIDR.Err() == nil {
-				return
-			}
-			var ts TSSlice
-			//有B帧
-			tmpVT := v.Stream.NewVideoTrack(0)
-			tmpVT.ExtraData = v.ExtraData
-			tmpVT.CodecID = v.CodecID
-			tmpVT.revIDR = func() {
-				l := ts.Len()
-				sort.Sort(ts)
-				start := tmpVT.Move(-l)
-				for i := 0; i < l; i++ {
-					vp := start.Value.(*RingItem).Value.(*VideoPack)
-					pack := vt.current()
-					pack.IDR = vp.IDR
-					pack.Timestamp = ts[i]
-					pack.CompositionTime = vp.Timestamp - ts[i]
-					pack.NALUs = vp.NALUs
-					vt.push(pack)
-					start = start.Next()
+		t1 := (v.Timestamp - t0) / 90
+		utils.Println("video:", t1)
+		tmpVT.PushNalu(t1, 0, v.Payload)
+		end := tmpVT.Prev()
+		if start != end {
+			for next := start; next != end; next = next.Next() {
+				vp := next.Value.(*RingItem).Value.(*VideoPack)
+				vpNext := next.Next().Value.(*RingItem).Value.(*VideoPack)
+				lastB := false
+				if p != nil && p.Timestamp < vpNext.Timestamp {
+					lastB = true
 				}
-				ts = nil
-			}
-			v.Push = func(payload []byte) {
-				if err := v.Unmarshal(payload); err != nil {
-					return
+				if vp.Timestamp > vpNext.Timestamp {
+					p = vp
 				}
-				r := tmpVT.Ring
-				t := (v.Timestamp - t0) / 90
-				if tmpVT.PushNalu(t, 0, v.Payload); r != tmpVT.Ring {
-					ts = append(ts, t)
+				pack := vt.current()
+				if p != nil {
+					if lastB {
+						pack.Timestamp = p.Timestamp
+						p = nil
+					} else {
+						pack.Timestamp = vpNext.Timestamp
+					}
+					pack.CompositionTime = vp.Timestamp - pack.Timestamp
+				} else {
+					pack.Timestamp = vp.Timestamp
 				}
+				pack.NALUs = vp.NALUs
+				pack.IDR = vp.IDR
+				vt.push(pack)
 			}
-			v.Push(payload)
-			return
+			start = end
 		}
-		vt.PushNalu(t1, 0, v.Payload)
+		// if t1 < vt.Prev().Value.(*RingItem).Value.(*VideoPack).Timestamp {
+		// 	if vt.WaitIDR.Err() == nil {
+		// 		return
+		// 	}
+		// 	var buffer, pool = list.New(), list.New()
+		// 	var ts TSSlice
+		// 	//有B帧
+		// 	tmpVT := v.Stream.NewVideoTrack(0)
+		// 	tmpVT.ExtraData = v.ExtraData
+		// 	tmpVT.CodecID = v.CodecID
+		// 	tmpVT.revIDR = func() {
+		// 		l := ts.Len()
+		// 		sort.Sort(ts)
+		// 		start := tmpVT.Move(-l)
+		// 		for i := 0; i < l; i++ {
+		// 			vp := start.Value.(*RingItem).Value.(*VideoPack)
+		// 			var pack *VideoPack
+		// 			if pool.Len() > 0 {
+		// 				pack = pool.Remove(pool.Front()).(*VideoPack)
+		// 			} else {
+		// 				pack = &VideoPack{}
+		// 			}
+		// 			pack.IDR = vp.IDR
+		// 			pack.Timestamp = ts[i]
+		// 			pack.CompositionTime = vp.Timestamp - ts[i]
+		// 			pack.NALUs = vp.NALUs
+		// 			buffer.PushBack(pack)
+		// 			start = start.Next()
+		// 		}
+		// 		ts = ts[:0]
+		// 	}
+		// 	v.Push = func(payload []byte) {
+		// 		if err := v.Unmarshal(payload); err != nil {
+		// 			return
+		// 		}
+		// 		r := tmpVT.Ring
+		// 		t := (v.Timestamp - t0) / 90
+		// 		if tmpVT.PushNalu(t, 0, v.Payload); r != tmpVT.Ring {
+		// 			ts = append(ts, t)
+		// 			if buffer.Len() > 0 {
+		// 				vp := buffer.Remove(buffer.Front()).(*VideoPack)
+		// 				pack := vt.current()
+		// 				pack.IDR = vp.IDR
+		// 				pack.Timestamp = vp.Timestamp
+		// 				pack.CompositionTime = vp.CompositionTime
+		// 				pack.NALUs = vp.NALUs
+		// 				vt.push(pack)
+		// 				pool.PushBack(vp)
+		// 			}
+		// 		}
+		// 	}
+		// 	v.Push(payload)
+		// 	return
+		// }
+		//vt.PushNalu(t1, 0, v.Payload)
 	}
-	v.Push(payload)
+	//v.Push(payload)
 }
 func (v *RTPAudio) push(payload []byte) {
 	at := v.AudioTrack
 	if err := v.Unmarshal(payload); err != nil {
 		return
 	}
-	startTime := v.Timestamp
+	t0 := v.Timestamp
 	switch at.CodecID {
 	case 10:
 		v.Push = func(payload []byte) {
 			if err := v.Unmarshal(payload); err != nil {
 				return
 			}
+			t1 := (v.Timestamp - t0) / 90
+			utils.Println("audio:", t1)
 			for _, payload = range codec.ParseRTPAAC(v.Payload) {
-				at.PushRaw((v.Timestamp-startTime)/90, payload)
+				at.PushRaw(t1, payload)
 			}
 		}
 	case 7, 8:
@@ -118,7 +173,7 @@ func (v *RTPAudio) push(payload []byte) {
 			if err := v.Unmarshal(payload); err != nil {
 				return
 			}
-			at.PushRaw((v.Timestamp-startTime)/8, v.Payload)
+			at.PushRaw((v.Timestamp-t0)/8, v.Payload)
 		}
 	}
 	v.Push(payload)
diff --git a/subscriber.go b/subscriber.go
index 6ace459..6c7b41f 100644
--- a/subscriber.go
+++ b/subscriber.go
@@ -6,6 +6,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/Monibuca/utils/v3"
 	"github.com/pkg/errors"
 )
 
@@ -94,6 +95,7 @@ func (s *Subscriber) Play(at *AudioTrack, vt *VideoTrack) {
 		case <-streamExit:
 			return
 		default:
+			utils.Println(vp.Timestamp, ap.Timestamp, ap.Timestamp > vp.Timestamp)
 			if ap.Timestamp > vp.Timestamp || ap.Timestamp == 0 {
 				s.OnVideo(vp.Copy(vst))
 				vr.MoveNext()
@@ -107,9 +109,17 @@ func (s *Subscriber) Play(at *AudioTrack, vt *VideoTrack) {
 	}
 }
 func (s *Subscriber) PlayAudio(at *AudioTrack) {
-	at.Play(s.Ctx2, s.OnAudio)
+	if s.Ctx2 != nil {
+		at.Play(s.OnAudio, s.Done(), s.Ctx2.Done())
+	} else {
+		at.Play(s.OnAudio, s.Done(), nil)
+	}
 }
 
 func (s *Subscriber) PlayVideo(vt *VideoTrack) {
-	vt.Play(s.Ctx2, s.OnVideo)
+	if s.Ctx2 != nil {
+		vt.Play(s.OnVideo, s.Done(), s.Ctx2.Done())
+	} else {
+		vt.Play(s.OnVideo, s.Done(), nil)
+	}
 }
diff --git a/video_track.go b/video_track.go
index b8ac4d7..0de32b0 100644
--- a/video_track.go
+++ b/video_track.go
@@ -120,9 +120,6 @@ func (vt *VideoTrack) pushNalu(ts uint32, cts uint32, nalus ...[]byte) {
 		}
 		pack.Payload = pack.Bytes()
 	}
-	vt.Do(func(v interface{}) {
-		v.(*RingItem).Value.(*VideoPack).Buffer = bytes.NewBuffer([]byte{})
-	})
 	switch vt.CodecID {
 	case 7:
 		{
@@ -544,11 +541,7 @@ func (vt *VideoTrack) push(pack *VideoPack) {
 		if vt.idrCount == 1 {
 			exRing := ring.New(5)
 			for x := exRing; x.Value == nil; x = x.Next() {
-				pack := new(VideoPack)
-				x.Value = &RingItem{Value: pack}
-				if vt.writeByteStream != nil {
-					pack.Buffer = bytes.NewBuffer([]byte{})
-				}
+				x.Value = &RingItem{Value: new(VideoPack)}
 			}
 			vt.Link(exRing) // 扩大缓冲环
 		} else {
@@ -558,26 +551,22 @@ func (vt *VideoTrack) push(pack *VideoPack) {
 	vt.Step()
 }
 
-func (vt *VideoTrack) Play(ctx context.Context, onVideo func(VideoPack)) {
-	var extraExit <-chan struct{}
-	if ctx != nil {
-		extraExit = ctx.Done()
-	}
-	streamExit := vt.Stream.Context.Done()
+func (vt *VideoTrack) Play(onVideo func(VideoPack), exit1, exit2 <-chan struct{}) {
 	select {
 	case <-vt.WaitIDR.Done():
-	case <-streamExit:
+	case <-exit1:
 		return
-	case <-extraExit: //可能等不到关键帧就退出了
+	case <-exit2: //可能等不到关键帧就退出了
 		return
 	}
 	vr := vt.SubRing(vt.IDRing) //从关键帧开始读取，首屏秒开
 	vp := vr.Read().(*VideoPack)
 	for startTimestamp := vp.Timestamp; vt.Goon(); vp = vr.Read().(*VideoPack) {
+		utils.Println(vp.Timestamp)
 		select {
-		case <-extraExit:
+		case <-exit1:
 			return
-		case <-streamExit:
+		case <-exit2:
 			return
 		default:
 			onVideo(vp.Copy(startTimestamp))