diff --git a/common/frame.go b/common/frame.go
index 05fe689..2cddab5 100644
--- a/common/frame.go
+++ b/common/frame.go
@@ -126,7 +126,7 @@ type AVFrame[T RawSlice] struct {
 	FLV     net.Buffers // 打包好的FLV Tag
 	AVCC    net.Buffers // 打包好的AVCC格式
 	RTP     []*RTPFrame
-	Raw     []T //裸数据
+	Raw     []T    // 裸数据
 	canRead bool
 }
 
diff --git a/common/index.go b/common/index.go
index 94dc234..de47902 100644
--- a/common/index.go
+++ b/common/index.go
@@ -9,6 +9,7 @@ import (
 type Track interface {
 	GetName() string
 	LastWriteTime() time.Time
+	
 }
 
 type AVTrack interface {
diff --git a/config/config.go b/config/config.go
index 4f0c7f4..eaeb703 100644
--- a/config/config.go
+++ b/config/config.go
@@ -5,7 +5,6 @@ import (
 	"net/http"
 	"reflect"
 	"strings"
-	"time"
 
 	"go.uber.org/zap"
 	"m7s.live/engine/v4/log"
@@ -13,12 +12,6 @@ import (
 
 type Config map[string]any
 
-type Second int
-
-func (s Second) Duration() time.Duration {
-	return time.Duration(s) * time.Second
-}
-
 type Plugin interface {
 	// 可能的入参类型：FirstConfig 第一次初始化配置，Config 后续配置更新，SE系列（StateEvent）流状态变化事件
 	OnEvent(any)
diff --git a/config/types.go b/config/types.go
index f7df432..28b5eb0 100644
--- a/config/types.go
+++ b/config/types.go
@@ -32,8 +32,8 @@ type Publish struct {
 	PubAudio         bool
 	PubVideo         bool
 	KickExist        bool   // 是否踢掉已经存在的发布者
-	PublishTimeout   Second // 发布无数据超时
-	WaitCloseTimeout Second // 延迟自动关闭（无订阅时）
+	PublishTimeout   int // 发布无数据超时
+	WaitCloseTimeout int // 延迟自动关闭（无订阅时）
 }
 
 func (c *Publish) GetPublishConfig() *Publish {
@@ -44,7 +44,7 @@ type Subscribe struct {
 	SubAudio    bool
 	SubVideo    bool
 	IFrameOnly  bool   // 只要关键帧
-	WaitTimeout Second // 等待流超时
+	WaitTimeout int // 等待流超时
 }
 
 func (c *Subscribe) GetSubscribeConfig() *Subscribe {
diff --git a/io.go b/io.go
index 5b1ce40..d29644a 100644
--- a/io.go
+++ b/io.go
@@ -111,7 +111,7 @@ func (io *IO[C, S]) receive(streamPath string, specific S, conf *C) error {
 	wt := time.Second * 5
 	var c any = conf
 	if v, ok := c.(*config.Subscribe); ok {
-		wt = v.WaitTimeout.Duration()
+		wt = util.Second2Duration(v.WaitTimeout)
 	}
 	if io.Context == nil {
 		io.Context, io.CancelFunc = context.WithCancel(Engine)
@@ -134,8 +134,8 @@ func (io *IO[C, S]) receive(streamPath string, specific S, conf *C) error {
 				return BadNameErr
 			}
 		}
-		s.PublishTimeout = v.PublishTimeout.Duration()
-		s.WaitCloseTimeout = v.WaitCloseTimeout.Duration()
+		s.PublishTimeout = util.Second2Duration(v.PublishTimeout)
+		s.WaitCloseTimeout = util.Second2Duration(v.WaitCloseTimeout)
 	} else if create {
 		EventBus <- s //通知发布者按需拉流
 	}
diff --git a/stream.go b/stream.go
index 4ba9da8..12fa0a4 100644
--- a/stream.go
+++ b/stream.go
@@ -301,7 +301,7 @@ func (s *Stream) run() {
 					io.Spesic = suber
 					s.Subscribers = append(s.Subscribers, suber)
 					sbConfig := io.Config
-					if wt := sbConfig.WaitTimeout.Duration(); wt > s.WaitTimeout {
+					if wt := util.Second2Duration(sbConfig.WaitTimeout); wt > s.WaitTimeout {
 						s.WaitTimeout = wt
 					}
 					io.Stream = s
diff --git a/subscriber.go b/subscriber.go
index 15d45a2..38eeacb 100644
--- a/subscriber.go
+++ b/subscriber.go
@@ -71,13 +71,29 @@ type ISubscriber interface {
 	PlayBlock()
 	Stop()
 }
+type PlayContext[T interface {
+	GetDecConfSeq() int
+	ReadRing() *AVRing[R]
+}, R RawSlice] struct {
+	Track   T
+	ring    *AVRing[R]
+	confSeq int
+	First   AVFrame[R]
+}
+
+func (p *PlayContext[T, R]) init(t T) {
+	p.Track = t
+	p.ring = t.ReadRing()
+}
+func (p *PlayContext[T, R]) decConfChanged() bool {
+	return p.confSeq != p.Track.GetDecConfSeq()
+}
+
 type TrackPlayer struct {
 	context.Context
 	context.CancelFunc
-	AudioTrack *track.Audio
-	VideoTrack *track.Video
-	vr         *AVRing[NALUSlice]
-	ar         *AVRing[AudioSlice]
+	Audio PlayContext[*track.Audio, AudioSlice]
+	Video PlayContext[*track.Video, NALUSlice]
 }
 
 // Subscriber 订阅者实体定义
@@ -89,10 +105,10 @@ type Subscriber struct {
 func (s *Subscriber) OnEvent(event any) {
 	switch v := event.(type) {
 	case TrackRemoved:
-		if a, ok := v.Track.(*track.Audio); ok && a == s.AudioTrack {
-			s.ar = nil
-		} else if v, ok := v.Track.(*track.Video); ok && v == s.VideoTrack {
-			s.vr = nil
+		if a, ok := v.Track.(*track.Audio); ok && a == s.Audio.Track {
+			s.Audio.ring = nil
+		} else if v, ok := v.Track.(*track.Video); ok && v == s.Video.Track {
+			s.Video.ring = nil
 		}
 	case Track: //默认接受所有track
 		s.AddTrack(v)
@@ -104,17 +120,15 @@ func (s *Subscriber) OnEvent(event any) {
 func (s *Subscriber) AddTrack(t Track) bool {
 	switch v := t.(type) {
 	case *track.Video:
-		if s.VideoTrack != nil || !s.Config.SubVideo {
+		if s.Video.Track != nil || !s.Config.SubVideo {
 			return false
 		}
-		s.VideoTrack = v
-		s.vr = v.ReadRing()
+		s.Video.init(v)
 	case *track.Audio:
-		if s.AudioTrack != nil || !s.Config.SubAudio {
+		if s.Audio.Track != nil || !s.Config.SubAudio {
 			return false
 		}
-		s.AudioTrack = v
-		s.ar = v.ReadRing()
+		s.Audio.init(v)
 	case *track.Data:
 	default:
 		return false
@@ -127,86 +141,84 @@ func (s *Subscriber) IsPlaying() bool {
 	return s.TrackPlayer.Context != nil && s.TrackPlayer.Err() == nil
 }
 
-// func (s *Subscriber) Stop() {
-// 	if s.IsPlaying() {
-// 		s.TrackPlayer.CancelFunc()
+// 非阻塞式读取，通过反复调用返回的函数可以尝试读取数据，读取到数据后会调用OnEvent，这种模式自由的在不同的goroutine中调用
+// func (s *Subscriber) Play(spesic ISubscriber) func() error {
+// 	s.Info("play")
+// 	var confSeqa, confSeqv int
+// 	var t time.Time
+// 	var startTime time.Time     //读到第一个关键帧的时间
+// 	var firstIFrame *VideoFrame //起始关键帧
+// 	var audioSent bool          //音频是否发送过
+// 	s.TrackPlayer.Context, s.TrackPlayer.CancelFunc = context.WithCancel(s.IO)
+// 	ctx := s.TrackPlayer.Context
+// 	var nextRoundReadAudio bool //下一次读取音频
+// 	return func() error {
+// 		if ctx.Err() != nil {
+// 			return ctx.Err()
+// 		}
+// 		if !nextRoundReadAudio || s.ar == nil {
+// 			if s.Video.ring != nil {
+// 				if startTime.IsZero() {
+// 					startTime = time.Now()
+// 					firstIFrame = (*VideoFrame)(s.Video.ring.Read(ctx)) // 这里阻塞读取为0耗时
+// 					s.FirstVideo = *firstIFrame
+// 					s.Debug("firstIFrame", zap.Uint32("seq", firstIFrame.Sequence))
+// 					if ctx.Err() != nil {
+// 						return ctx.Err()
+// 					}
+// 					confSeqv = s.VideoTrack.DecoderConfiguration.Seq
+// 					spesic.OnEvent(VideoDeConf(s.VideoTrack.DecoderConfiguration))
+// 					spesic.OnEvent(firstIFrame)
+// 					s.Video.ring.MoveNext()
+// 					if firstIFrame.Timestamp.After(t) {
+// 						t = firstIFrame.Timestamp
+// 					}
+// 					return nil
+// 				} else if firstIFrame == nil {
+// 					if vp := (s.Video.ring.TryRead()); vp != nil {
+// 						if vp.IFrame && confSeqv != s.VideoTrack.DecoderConfiguration.Seq {
+// 							confSeqv = s.VideoTrack.DecoderConfiguration.Seq
+// 							spesic.OnEvent(VideoDeConf(s.VideoTrack.DecoderConfiguration))
+// 						}
+// 						spesic.OnEvent((*VideoFrame)(vp))
+// 						s.Video.ring.MoveNext()
+// 						// 如果本次读取的视频时间戳比较大，下次给音频一个机会
+// 						if nextRoundReadAudio = vp.Timestamp.After(t); nextRoundReadAudio {
+// 							t = vp.Timestamp
+// 						}
+// 						return nil
+// 					}
+// 				}
+// 			} else if s.Config.SubVideo && (s.Stream == nil || s.Stream.Publisher == nil || s.Stream.Publisher.GetConfig().PubVideo) {
+// 				// 如果订阅了视频需要等待视频轨道
+// 				// TODO: 如果发布配置了视频，订阅配置了视频，但是实际上没有视频，需要处理播放纯音频
+// 				return nil
+// 			}
+// 		}
+// 		// 正常模式下或者纯音频模式下，音频开始播放
+// 		if s.ar != nil && firstIFrame == nil {
+// 			if !audioSent {
+// 				confSeqa = s.AudioTrack.DecoderConfiguration.Seq
+// 				spesic.OnEvent(AudioDeConf(s.AudioTrack.DecoderConfiguration))
+// 				audioSent = true
+// 			}
+// 			if ap := s.ar.TryRead(); ap != nil {
+// 				if s.AudioTrack.DecoderConfiguration.Raw != nil && confSeqa != s.AudioTrack.DecoderConfiguration.Seq {
+// 					spesic.OnEvent(AudioDeConf(s.AudioTrack.DecoderConfiguration))
+// 				}
+// 				spesic.OnEvent(ap)
+// 				s.ar.MoveNext()
+// 				// 这次如果音频比较大，则下次读取给视频一个机会
+// 				if nextRoundReadAudio = !ap.Timestamp.After(t); !nextRoundReadAudio {
+// 					t = ap.Timestamp
+// 				}
+// 				return nil
+// 			}
+// 		}
+// 		return nil
 // 	}
 // }
 
-// 非阻塞式读取，通过反复调用返回的函数可以尝试读取数据，读取到数据后会调用OnEvent，这种模式自由的在不同的goroutine中调用
-func (s *Subscriber) Play(spesic ISubscriber) func() error {
-	s.Info("play")
-	var confSeqa, confSeqv int
-	var t time.Time
-	var startTime time.Time     //读到第一个关键帧的时间
-	var firstIFrame *VideoFrame //起始关键帧
-	var audioSent bool          //音频是否发送过
-	s.TrackPlayer.Context, s.TrackPlayer.CancelFunc = context.WithCancel(s.IO)
-	ctx := s.TrackPlayer.Context
-	var nextRoundReadAudio bool //下一次读取音频
-	return func() error {
-		if ctx.Err() != nil {
-			return ctx.Err()
-		}
-		if !nextRoundReadAudio || s.ar == nil {
-			if s.vr != nil {
-				if startTime.IsZero() {
-					startTime = time.Now()
-					firstIFrame = (*VideoFrame)(s.vr.Read(ctx)) // 这里阻塞读取为0耗时
-					s.Debug("firstIFrame", zap.Uint32("seq", firstIFrame.Sequence))
-					if ctx.Err() != nil {
-						return ctx.Err()
-					}
-					confSeqv = s.VideoTrack.DecoderConfiguration.Seq
-					spesic.OnEvent(VideoDeConf(s.VideoTrack.DecoderConfiguration))
-					spesic.OnEvent(firstIFrame)
-					s.vr.MoveNext()
-					if firstIFrame.Timestamp.After(t) {
-						t = firstIFrame.Timestamp
-					}
-					return nil
-				} else if firstIFrame == nil {
-					if vp := (s.vr.TryRead()); vp != nil {
-						if vp.IFrame && confSeqv != s.VideoTrack.DecoderConfiguration.Seq {
-							confSeqv = s.VideoTrack.DecoderConfiguration.Seq
-							spesic.OnEvent(VideoDeConf(s.VideoTrack.DecoderConfiguration))
-						}
-						spesic.OnEvent((*VideoFrame)(vp))
-						s.vr.MoveNext()
-						// 如果本次读取的视频时间戳比较大，下次给音频一个机会
-						if nextRoundReadAudio = vp.Timestamp.After(t); nextRoundReadAudio {
-							t = vp.Timestamp
-						}
-						return nil
-					}
-				}
-			} else if s.Config.SubVideo && (s.Stream == nil || s.Stream.Publisher == nil || s.Stream.Publisher.GetConfig().PubVideo) {
-				// 如果订阅了视频需要等待视频轨道
-				// TODO: 如果发布配置了视频，订阅配置了视频，但是实际上没有视频，需要处理播放纯音频
-				return nil
-			}
-		}
-		// 正常模式下或者纯音频模式下，音频开始播放
-		if s.ar != nil && firstIFrame == nil {
-			if !audioSent {
-				confSeqa = s.AudioTrack.DecoderConfiguration.Seq
-				spesic.OnEvent(AudioDeConf(s.AudioTrack.DecoderConfiguration))
-				audioSent = true
-			}
-			if ap := s.ar.TryRead(); ap != nil {
-				spesic.OnEvent(ap)
-				s.ar.MoveNext()
-				// 这次如果音频比较大，则下次读取给视频一个机会
-				if nextRoundReadAudio = !ap.Timestamp.After(t); !nextRoundReadAudio {
-					t = ap.Timestamp
-				}
-				return nil
-			}
-		}
-		return nil
-	}
-}
-
 //PlayBlock 阻塞式读取数据
 func (s *Subscriber) PlayBlock() {
 	spesic := s.Spesic
@@ -216,49 +228,52 @@ func (s *Subscriber) PlayBlock() {
 	}
 	s.Info("playblock")
 	var t time.Time
-	var startTime time.Time     //读到第一个关键帧的时间
-	var firstIFrame *VideoFrame //起始关键帧
-	var audioSent bool          //音频是否发送过
+	var startTime time.Time //读到第一个关键帧的时间
+	var normal bool         //正常模式——已追上正常的进度
+	var audioSent bool      //音频是否发送过
 	s.TrackPlayer.Context, s.TrackPlayer.CancelFunc = context.WithCancel(s.IO)
 	ctx := s.TrackPlayer.Context
 	defer s.Info("stop")
 	for ctx.Err() == nil {
-		if s.vr != nil {
+		if s.Video.ring != nil {
 			if startTime.IsZero() {
 				startTime = time.Now()
-				firstIFrame = (*VideoFrame)(s.vr.Read(ctx))
-				s.Debug("firstIFrame", zap.Uint32("seq", firstIFrame.Sequence))
+				s.Video.First = *(s.Video.ring.Read(ctx)) //不使用指针存储，为了永久保留数据
+				s.Debug("firstIFrame", zap.Uint32("seq", s.Video.First.Sequence))
 				if ctx.Err() != nil {
 					return
 				}
-				spesic.OnEvent(VideoDeConf(s.VideoTrack.DecoderConfiguration))
+				s.sendVideoDecConf()
 			}
 			for {
 				var vp *VideoFrame
 				// 如果进入正常模式
-				if firstIFrame == nil {
-					vp = (*VideoFrame)(s.vr.Read(ctx))
+				if normal {
+					vp = (*VideoFrame)(s.Video.ring.Read(ctx))
 					if ctx.Err() != nil {
 						return
 					}
+					if vp.IFrame && s.Video.decConfChanged() {
+						s.sendVideoDecConf()
+					}
 					spesic.OnEvent(vp)
-					s.vr.MoveNext()
+					s.Video.ring.MoveNext()
 				} else {
-					if s.VideoTrack.IDRing.Value.Sequence != firstIFrame.Sequence {
-						firstIFrame = nil
-						s.vr = s.VideoTrack.ReadRing()
-						s.Debug("skip to latest key frame", zap.Uint32("seq", s.VideoTrack.IDRing.Value.Sequence))
+					if s.Video.Track.IDRing.Value.Sequence != s.Video.First.Sequence {
+						normal = true
+						s.Video.ring = s.Video.Track.ReadRing()
+						s.Debug("skip to latest key frame", zap.Uint32("seq", s.Video.Track.IDRing.Value.Sequence))
 						continue
 					} else {
-						vp = (*VideoFrame)(s.vr.Read(ctx))
+						vp = (*VideoFrame)(s.Video.ring.Read(ctx))
 						if ctx.Err() != nil {
 							return
 						}
 						spesic.OnEvent(vp)
-						if fast := time.Duration(vp.AbsTime-firstIFrame.AbsTime)*time.Millisecond - time.Since(startTime); fast > 0 {
+						if fast := time.Duration(vp.AbsTime-s.Video.First.AbsTime)*time.Millisecond - time.Since(startTime); fast > 0 {
 							time.Sleep(fast)
 						}
-						s.vr.MoveNext()
+						s.Video.ring.MoveNext()
 					}
 				}
 				if vp.Timestamp.After(t) {
@@ -272,20 +287,23 @@ func (s *Subscriber) PlayBlock() {
 			continue
 		}
 		// 正常模式下或者纯音频模式下，音频开始播放
-		if s.ar != nil && firstIFrame == nil {
+		if s.Audio.ring != nil && normal {
 			if !audioSent {
-				if s.AudioTrack.IsAAC() {
-					spesic.OnEvent(AudioDeConf(s.AudioTrack.DecoderConfiguration))
+				if s.Audio.Track.IsAAC() {
+					s.sendAudioDecConf()
 				}
 				audioSent = true
 			}
 			for {
-				ap := (*AudioFrame)(s.ar.Read(ctx))
+				ap := (*AudioFrame)(s.Audio.ring.Read(ctx))
 				if ctx.Err() != nil {
 					return
 				}
+				if s.Audio.Track.IsAAC() && s.Audio.decConfChanged() {
+					s.sendAudioDecConf()
+				}
 				spesic.OnEvent(ap)
-				s.ar.MoveNext()
+				s.Audio.ring.MoveNext()
 				if ap.Timestamp.After(t) {
 					t = ap.Timestamp
 					break
@@ -295,6 +313,15 @@ func (s *Subscriber) PlayBlock() {
 	}
 }
 
+func (s *Subscriber) sendVideoDecConf() {
+	s.Video.confSeq = s.Video.Track.DecoderConfiguration.Seq
+	s.Spesic.OnEvent(VideoDeConf(s.Video.Track.DecoderConfiguration))
+}
+func (s *Subscriber) sendAudioDecConf() {
+	s.Audio.confSeq = s.Audio.Track.DecoderConfiguration.Seq
+	s.Spesic.OnEvent(AudioDeConf(s.Audio.Track.DecoderConfiguration))
+}
+
 type IPusher interface {
 	ISubscriber
 	Push()
diff --git a/track/aac.go b/track/aac.go
index dd3473e..0e67ee7 100644
--- a/track/aac.go
+++ b/track/aac.go
@@ -59,11 +59,7 @@ func (aac *AAC) WriteAVCC(ts uint32, frame AVCCFrame) {
 	if frame.IsSequence() {
 		aac.DecoderConfiguration.AVCC = net.Buffers{frame}
 		config1, config2 := frame[2], frame[3]
-		//audioObjectType = (config1 & 0xF8) >> 3
-		// 1 AAC MAIN 	ISO/IEC 14496-3 subpart 4
-		// 2 AAC LC 	ISO/IEC 14496-3 subpart 4
-		// 3 AAC SSR 	ISO/IEC 14496-3 subpart 4
-		// 4 AAC LTP 	ISO/IEC 14496-3 subpart 4
+		aac.Profile = (config1 & 0xF8) >> 3
 		aac.Channels = ((config2 >> 3) & 0x0F) //声道
 		aac.SampleRate = uint32(codec.SamplingFrequencies[((config1&0x7)<<1)|(config2>>7)])
 		aac.DecoderConfiguration.Raw = AudioSlice(frame[2:])
diff --git a/track/audio.go b/track/audio.go
index cf002d3..9f0b9b3 100644
--- a/track/audio.go
+++ b/track/audio.go
@@ -17,12 +17,20 @@ type Audio struct {
 	CodecID  codec.AudioCodecID
 	Channels byte
 	AVCCHead []byte // 音频包在AVCC格式中，AAC会有两个字节，其他的只有一个字节
+	// Profile:
+	// 0: Main profile
+	// 1: Low Complexity profile(LC)
+	// 2: Scalable Sampling Rate profile(SSR)
+	// 3: Reserved
+	Profile byte
 }
 
 func (a *Audio) IsAAC() bool {
 	return a.CodecID == codec.CodecID_AAC
 }
-
+func (a *Audio) GetDecConfSeq() int {
+	return a.DecoderConfiguration.Seq
+}
 func (a *Audio) Attach() {
 	a.Stream.AddTrack(a)
 }
@@ -41,10 +49,10 @@ func (a *Audio) GetInfo() *Audio {
 }
 
 func (a *Audio) WriteADTS(adts []byte) {
-	profile := ((adts[2] & 0xc0) >> 6) + 1
+	a.Profile = ((adts[2] & 0xc0) >> 6) + 1
 	sampleRate := (adts[2] & 0x3c) >> 2
 	channel := ((adts[2] & 0x1) << 2) | ((adts[3] & 0xc0) >> 6)
-	config1 := (profile << 3) | ((sampleRate & 0xe) >> 1)
+	config1 := (a.Profile << 3) | ((sampleRate & 0xe) >> 1)
 	config2 := ((sampleRate & 0x1) << 7) | (channel << 3)
 	a.SampleRate = uint32(codec.SamplingFrequencies[sampleRate])
 	a.Channels = channel
diff --git a/track/video.go b/track/video.go
index 2b6e969..a1c7647 100644
--- a/track/video.go
+++ b/track/video.go
@@ -21,6 +21,9 @@ type Video struct {
 	idrCount    int //缓存中包含的idr数量
 }
 
+func (t *Video) GetDecConfSeq() int {
+	return t.DecoderConfiguration.Seq
+}
 func (t *Video) Attach() {
 	t.Stream.AddTrack(t)
 }
diff --git a/util/buffer.go b/util/buffer.go
index 3aa02cd..636f9f0 100644
--- a/util/buffer.go
+++ b/util/buffer.go
@@ -87,6 +87,14 @@ func (b *Buffer) Glow(n int) {
 	*b = b.SubBuf(0, l)
 }
 
+// ConcatBuffers 合并碎片内存为一个完整内存
+func ConcatBuffers[T ~[]byte](input []T) (out []byte) {
+	for _, v := range input {
+		out = append(out, v...)
+	}
+	return
+}
+
 // SizeOfBuffers 计算Buffers的内容长度
 func SizeOfBuffers[T ~[]byte](buf []T) (size int) {
 	for _, b := range buf {
diff --git a/util/convert.go b/util/convert.go
index 2bf429b..9a90dab 100644
--- a/util/convert.go
+++ b/util/convert.go
@@ -3,8 +3,13 @@ package util
 import (
 	"errors"
 	"io"
+	"time"
 )
 
+func Second2Duration(s int) time.Duration {
+	return time.Duration(s) * time.Second
+}
+
 /*
 func ReadByteToUintX(r io.Reader, l int) (data uint64, err error) {
 	if l%8 != 0 || l > 64 {