diff --git a/client.go b/client.go
index 01d2750..7ecea1c 100644
--- a/client.go
+++ b/client.go
@@ -4,9 +4,9 @@ import (
 	"context"
 	"net"
 
-	"github.com/bluenviron/gortsplib/v3"
-	"github.com/bluenviron/gortsplib/v3/pkg/base"
-	"github.com/bluenviron/gortsplib/v3/pkg/url"
+	"github.com/bluenviron/gortsplib/v4"
+	"github.com/bluenviron/gortsplib/v4/pkg/base"
+	"github.com/bluenviron/gortsplib/v4/pkg/url"
 	"go.uber.org/zap"
 	"m7s.live/engine/v4"
 )
@@ -30,9 +30,9 @@ func (p *RTSPClient) Disconnect() {
 
 func (p *RTSPPuller) Connect() error {
 	client := &gortsplib.Client{
-		DialContext:     p.DialContext,
-		ReadBufferCount: rtspConfig.ReadBufferCount,
-		AnyPortEnable:   true,
+		DialContext: p.DialContext,
+
+		AnyPortEnable: true,
 	}
 	p.Transport = gortsplib.TransportTCP
 	client.Transport = &p.Transport
@@ -59,19 +59,19 @@ func (p *RTSPPuller) Pull() (err error) {
 	}
 	p.Debug("Options", zap.Any("res", res))
 	// find published tracks
-	tracks, baseURL, res, err := p.Describe(u)
+	session, res, err := p.Describe(u)
 	if err != nil {
 		p.Error("Describe", zap.Error(err))
 		return err
 	}
 	p.Debug("Describe", zap.Any("res", res))
-	p.tracks = tracks
+	p.session = session
 	err = p.SetTracks()
 	if err != nil {
 		p.Error("SetTracks", zap.Error(err))
 		return err
 	}
-	if err = p.SetupAll(tracks, baseURL); err != nil {
+	if err = p.SetupAll(session.BaseURL, session.Medias); err != nil {
 		p.Error("SetupAndPlay", zap.Error(err))
 		return err
 	}
@@ -104,8 +104,8 @@ func (p *RTSPPusher) OnEvent(event any) {
 
 func (p *RTSPPusher) Connect() error {
 	p.Client = &gortsplib.Client{
-		DialContext:      p.DialContext,
-		WriteBufferCount: rtspConfig.WriteBufferCount,
+		DialContext:    p.DialContext,
+		WriteQueueSize: rtspConfig.WriteBufferCount,
 	}
 	// parse URL
 	u, err := url.Parse(p.RemoteURL)
@@ -131,11 +131,11 @@ func (p *RTSPPusher) Push() (err error) {
 	// 		return fmt.Errorf("timeout")
 	// 	}
 	// }
-	if _, err = p.Announce(u, p.tracks); err != nil {
+	if _, err = p.Announce(u, p.session); err != nil {
 		p.Error("Announce", zap.Error(err))
 		return
 	}
-	err = p.SetupAll(p.tracks, u)
+	err = p.SetupAll(p.session.BaseURL, p.session.Medias)
 	if err != nil {
 		p.Error("Setup", zap.Error(err))
 		return
diff --git a/go.mod b/go.mod
index d551c3a..73c2466 100644
--- a/go.mod
+++ b/go.mod
@@ -3,9 +3,9 @@ module m7s.live/plugin/rtsp/v4
 go 1.18
 
 require (
-	github.com/bluenviron/gortsplib/v3 v3.10.0
-	github.com/bluenviron/mediacommon v1.0.0
-	github.com/pion/rtp v1.8.1
+  github.com/bluenviron/gortsplib/v4 v4.2.1
+	github.com/bluenviron/mediacommon v1.5.0
+	github.com/pion/rtp v1.8.2
 	go.uber.org/zap v1.24.0
 	m7s.live/engine/v4 v4.13.12
 )
@@ -17,7 +17,7 @@ require (
 	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
 	github.com/golang/mock v1.6.0 // indirect
 	github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 // indirect
-	github.com/google/uuid v1.3.0 // indirect
+	github.com/google/uuid v1.3.1 // indirect
 	github.com/logrusorgru/aurora/v4 v4.0.0 // indirect
 	github.com/lufia/plan9stats v0.0.0-20230326075908-cb1d2100619a // indirect
 	github.com/mcuadros/go-defaults v1.2.0 // indirect
@@ -38,12 +38,12 @@ require (
 	github.com/yusufpapurcu/wmi v1.2.3 // indirect
 	go.uber.org/atomic v1.10.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	golang.org/x/crypto v0.12.0 // indirect
+	golang.org/x/crypto v0.14.0 // indirect
 	golang.org/x/exp v0.0.0-20221205204356-47842c84f3db // indirect
 	golang.org/x/mod v0.10.0 // indirect
-	golang.org/x/net v0.14.0 // indirect
+	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/sync v0.2.0 // indirect
-	golang.org/x/sys v0.11.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
 	golang.org/x/tools v0.9.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-)
+)
\ No newline at end of file
diff --git a/go.sum b/go.sum
index 032879e..df5159d 100644
--- a/go.sum
+++ b/go.sum
@@ -1,9 +1,11 @@
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
-github.com/bluenviron/gortsplib/v3 v3.10.0 h1:E2ytPD1/b6JgzHYVSsyaG2xtXsvaGw9sxTdZ0Wnwsd4=
-github.com/bluenviron/gortsplib/v3 v3.10.0/go.mod h1:prNU1aMVBmgmmKwlvLiEdjBbTEpTw4BRsqVcqEARgMY=
-github.com/bluenviron/mediacommon v1.0.0 h1:hKelTQKfetasCmXaXMiL1ihID0GRmItyWZt1/pqiKKk=
-github.com/bluenviron/mediacommon v1.0.0/go.mod h1:nt5oKCO0WcZ+AH1oc12gs2ldp67xW2vl88c2StNmPlI=
+github.com/bluenviron/gortsplib/v4 v3.11.0 h1:oE8j9/2+T2JyttEO9SkJKskRerdMaW10zPoI0vEIlz4=
+github.com/bluenviron/gortsplib/v4 v3.11.0/go.mod h1:LZewC0KP6zhBceENKiSMNEryqGHljoIMq5W1SVS4vNs=
+github.com/bluenviron/gortsplib/v4 v4.2.1 h1:LugQr3TIKoj6GjOf470teDP8goWiL8PTrX2OaF+L2Vc=
+github.com/bluenviron/gortsplib/v4 v4.2.1/go.mod h1:VOoeI2VxRKh5eEg6Y48DGb/oLxU1i+X0Xzv9z8dvsUQ=
+github.com/bluenviron/mediacommon v1.5.0 h1:lS0YKNo22ZOyCsYcLh3jn3TgUALqYw0f7RVwalC09vI=
+github.com/bluenviron/mediacommon v1.5.0/go.mod h1:Ij/kE1LEucSjryNBVTyPL/gBI0d6/Css3f5PyrM957w=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
@@ -50,8 +52,9 @@ github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 h1:yAJXTCF9TqKcTiHJAE8dj7HMvPfh66eeA2JYW7eFpSE=
 github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
-github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/uuid v1.3.1 h1:KjJaJ9iWZ3jOFZIf1Lqf4laDRCasjl0BCmnEGxkdLb4=
+github.com/google/uuid v1.3.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
@@ -98,8 +101,8 @@ github.com/pion/rtcp v1.2.10/go.mod h1:ztfEwXZNLGyF1oQDttz/ZKIBaeeg/oWbRYqzBM9TL
 github.com/pion/rtp v1.6.2/go.mod h1:bDb5n+BFZxXx0Ea7E5qe+klMuqiBrP+w8XSjiWtCUko=
 github.com/pion/rtp v1.7.13/go.mod h1:bDb5n+BFZxXx0Ea7E5qe+klMuqiBrP+w8XSjiWtCUko=
 github.com/pion/rtp v1.8.0/go.mod h1:pBGHaFt/yW7bf1jjWAoUjpSNoDnw98KTMg+jWWvziqU=
-github.com/pion/rtp v1.8.1 h1:26OxTc6lKg/qLSGir5agLyj0QKaOv8OP5wps2SFnVNQ=
-github.com/pion/rtp v1.8.1/go.mod h1:pBGHaFt/yW7bf1jjWAoUjpSNoDnw98KTMg+jWWvziqU=
+github.com/pion/rtp v1.8.2 h1:oKMM0K1/QYQ5b5qH+ikqDSZRipP5mIxPJcgcvw5sH0w=
+github.com/pion/rtp v1.8.2/go.mod h1:pBGHaFt/yW7bf1jjWAoUjpSNoDnw98KTMg+jWWvziqU=
 github.com/pion/sctp v1.8.5/go.mod h1:SUFFfDpViyKejTAdwD1d/HQsCu+V/40cCs2nZIvC3s0=
 github.com/pion/sctp v1.8.7/go.mod h1:g1Ul+ARqZq5JEmoFy87Q/4CePtKnTJ1QCL9dBBdN6AU=
 github.com/pion/sdp/v3 v3.0.6 h1:WuDLhtuFUUVpTfus9ILC4HRyHsW6TdugjEX/QY9OiUw=
@@ -173,8 +176,8 @@ golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5y
 golang.org/x/crypto v0.8.0/go.mod h1:mRqEX+O9/h5TFCrQhkgjo2yKi0yYA+9ecGkdQoHrywE=
 golang.org/x/crypto v0.10.0/go.mod h1:o4eNf7Ede1fv+hwOwZsTHl9EsPFO6q6ZvYR8vYfY45I=
 golang.org/x/crypto v0.11.0/go.mod h1:xgJhtzW8F9jGdVFWZESrid1U1bjeNy4zgy5cRr/CIio=
-golang.org/x/crypto v0.12.0 h1:tFM/ta59kqch6LlvYnPa0yx5a83cL2nHflFhYKvv9Yk=
-golang.org/x/crypto v0.12.0/go.mod h1:NF0Gs7EO5K4qLn+Ylc+fih8BSTeIjAP05siRnAh98yw=
+golang.org/x/crypto v0.14.0 h1:wBqGXzWJW6m1XrIKlAH0Hs1JJ7+9KBwnIO8v66Q9cHc=
+golang.org/x/crypto v0.14.0/go.mod h1:MVFd36DqK4CsrnJYDkBA3VC4m2GkXAM0PvzMCn4JQf4=
 golang.org/x/exp v0.0.0-20221205204356-47842c84f3db h1:D/cFflL63o2KSLJIwjlcIt8PR064j/xsmdEJL/YvY/o=
 golang.org/x/exp v0.0.0-20221205204356-47842c84f3db/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
@@ -200,8 +203,8 @@ golang.org/x/net v0.9.0/go.mod h1:d48xBJpPfHeWQsugry2m+kC02ZBRGRgulfHnEXEuWns=
 golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/net v0.11.0/go.mod h1:2L/ixqYpgIVXmeoSA/4Lu7BzTG4KIyPIryS4IsOd1oQ=
 golang.org/x/net v0.12.0/go.mod h1:zEVYFnQC7m/vmpQFELhcD1EWkZlX69l4oqgmer6hfKA=
-golang.org/x/net v0.14.0 h1:BONx9s002vGdD9umnlX1Po8vOZmrgH34qlHcD1MfK14=
-golang.org/x/net v0.14.0/go.mod h1:PpSgVXXLK0OxS0F31C1/tv6XNguvCrnXIDrFMspZIUI=
+golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
+golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -239,8 +242,8 @@ golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.9.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM=
-golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
@@ -263,7 +266,7 @@ golang.org/x/text v0.8.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.10.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/text v0.11.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
-golang.org/x/text v0.12.0 h1:k+n5B8goJNdU7hSvEtMUz3d1Q6D/XW4COJSJR6fN0mc=
+golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
diff --git a/main.go b/main.go
index 7545398..b007ce7 100644
--- a/main.go
+++ b/main.go
@@ -5,7 +5,7 @@ import (
 	"strconv"
 	"sync"
 
-	"github.com/bluenviron/gortsplib/v3"
+	"github.com/bluenviron/gortsplib/v4"
 	"go.uber.org/zap"
 	. "m7s.live/engine/v4"
 	"m7s.live/engine/v4/config"
@@ -20,15 +20,15 @@ type RTSPConfig struct {
 	ListenAddr       string `default:":554"`
 	UDPAddr          string `default:":8000"`
 	RTCPAddr         string `default:":8001"`
-	ReadBufferCount  int    `default:"2048"`
 	WriteBufferCount int    `default:"2048"`
 	sync.Map
+	server *gortsplib.Server
 }
 
 func (conf *RTSPConfig) OnEvent(event any) {
 	switch v := event.(type) {
 	case FirstConfig:
-		s := &gortsplib.Server{
+		conf.server = &gortsplib.Server{
 			Handler:           conf,
 			RTSPAddress:       conf.ListenAddr,
 			UDPRTPAddress:     conf.UDPAddr,
@@ -36,10 +36,9 @@ func (conf *RTSPConfig) OnEvent(event any) {
 			MulticastIPRange:  "224.1.0.0/16",
 			MulticastRTPPort:  8002,
 			MulticastRTCPPort: 8003,
-			ReadBufferCount:   conf.ReadBufferCount,
-			WriteBufferCount:  conf.WriteBufferCount,
+			WriteQueueSize:    conf.WriteBufferCount,
 		}
-		if err := s.Start(); err != nil {
+		if err := conf.server.Start(); err != nil {
 			RTSPPlugin.Error("server start", zap.Error(err))
 			RTSPPlugin.Disabled = true
 		}
@@ -55,9 +54,9 @@ func (conf *RTSPConfig) OnEvent(event any) {
 			}
 		}
 	case InvitePublish: //按需拉流
-		if url, ok := conf.PullOnSub[v.Target]; ok {
-			if err := RTSPPlugin.Pull(v.Target, url, new(RTSPPuller), 0); err != nil {
-				RTSPPlugin.Error("pull", zap.String("streamPath", v.Target), zap.String("url", url), zap.Error(err))
+		if remoteURL := conf.CheckPullOnSub(v.Target); remoteURL != "" {
+			if err := RTSPPlugin.Pull(v.Target, remoteURL, new(RTSPPuller), 0); err != nil {
+				RTSPPlugin.Error("pull", zap.String("streamPath", v.Target), zap.String("url", remoteURL), zap.Error(err))
 			}
 		}
 	}
diff --git a/publisher.go b/publisher.go
index 97f10ee..646c928 100644
--- a/publisher.go
+++ b/publisher.go
@@ -3,8 +3,8 @@ package rtsp
 import (
 	"strings"
 
-	"github.com/bluenviron/gortsplib/v3/pkg/formats"
-	"github.com/bluenviron/gortsplib/v3/pkg/media"
+	"github.com/bluenviron/gortsplib/v4/pkg/description"
+	"github.com/bluenviron/gortsplib/v4/pkg/format"
 	"github.com/bluenviron/mediacommon/pkg/codecs/mpeg4audio"
 	"github.com/pion/rtp"
 	"go.uber.org/zap"
@@ -15,21 +15,21 @@ import (
 
 type RTSPPublisher struct {
 	Publisher
-	Tracks map[*media.Media]common.AVTrack `json:"-" yaml:"-"`
+	Tracks map[*description.Media]common.AVTrack `json:"-" yaml:"-"`
 	RTSPIO
 }
 
 func (p *RTSPPublisher) SetTracks() error {
-	p.Tracks = make(map[*media.Media]common.AVTrack, len(p.tracks))
+	p.Tracks = make(map[*description.Media]common.AVTrack, len(p.session.Medias))
 	defer func() {
 		for _, track := range p.Tracks {
 			p.Info("set track", zap.String("name", track.GetName()))
 		}
 	}()
-	for _, track := range p.tracks {
+	for _, track := range p.session.Medias {
 		for _, forma := range track.Formats {
 			switch f := forma.(type) {
-			case *formats.H264:
+			case *format.H264:
 				vt := p.VideoTrack
 				if vt == nil {
 					vt = NewH264(p.Stream, f.PayloadType())
@@ -42,7 +42,7 @@ func (p *RTSPPublisher) SetTracks() error {
 				if len(f.PPS) > 0 {
 					vt.WriteSliceBytes(f.PPS)
 				}
-			case *formats.H265:
+			case *format.H265:
 				vt := p.VideoTrack
 				if vt == nil {
 					vt = NewH265(p.Stream, f.PayloadType())
@@ -58,7 +58,7 @@ func (p *RTSPPublisher) SetTracks() error {
 				if len(f.PPS) > 0 {
 					vt.WriteSliceBytes(f.PPS)
 				}
-			case *formats.MPEG4Audio:
+			case *format.MPEG4Audio:
 				at := p.AudioTrack
 				if at == nil {
 					at := NewAAC(p.Stream, f.PayloadType(), uint32(f.Config.SampleRate))
@@ -75,7 +75,7 @@ func (p *RTSPPublisher) SetTracks() error {
 					p.AudioTrack = at
 				}
 				p.Tracks[track] = p.AudioTrack
-			case *formats.G711:
+			case *format.G711:
 				at := p.AudioTrack
 				if at == nil {
 					at := NewG711(p.Stream, !f.MULaw, f.PayloadType(), uint32(f.ClockRate()))
@@ -96,7 +96,7 @@ func (p *RTSPPublisher) SetTracks() error {
 					}
 					p.Tracks[track] = p.AudioTrack
 				} else {
-					p.Warn("unknown format", zap.Any("format", f.String()))
+					p.Warn("unknown format", zap.Any("format", f.FMTP()))
 				}
 			}
 		}
@@ -112,7 +112,7 @@ func (p *RTSPPublisher) SetTracks() error {
 	return nil
 }
 
-func (p *RTSPPublisher) OnPacket(m *media.Media, f formats.Format, pack *rtp.Packet) {
+func (p *RTSPPublisher) OnPacket(m *description.Media, f format.Format, pack *rtp.Packet) {
 	if t, ok := p.Tracks[m]; ok {
 		t.WriteRTPPack(pack)
 	}
diff --git a/server.go b/server.go
index 7f59280..fed94fa 100644
--- a/server.go
+++ b/server.go
@@ -1,18 +1,20 @@
 package rtsp
 
 import (
-	"github.com/bluenviron/gortsplib/v3"
-	"github.com/bluenviron/gortsplib/v3/pkg/base"
-	"github.com/bluenviron/gortsplib/v3/pkg/media"
+	"github.com/bluenviron/gortsplib/v4"
+	"github.com/bluenviron/gortsplib/v4/pkg/base"
+	"github.com/bluenviron/gortsplib/v4/pkg/description"
 	"go.uber.org/zap"
 	. "m7s.live/engine/v4"
 )
 
 type RTSPIO struct {
-	tracks     media.Medias
+	server     *gortsplib.Server
+	session    *description.Session
+	tracks     []*description.Media
 	stream     *gortsplib.ServerStream
-	audioTrack *media.Media
-	videoTrack *media.Media
+	audioTrack *description.Media
+	videoTrack *description.Media
 }
 
 func (conf *RTSPConfig) OnConnOpen(ctx *gortsplib.ServerHandlerOnConnOpenCtx) {
@@ -39,6 +41,7 @@ func (conf *RTSPConfig) OnSessionClose(ctx *gortsplib.ServerHandlerOnSessionClos
 func (conf *RTSPConfig) OnDescribe(ctx *gortsplib.ServerHandlerOnDescribeCtx) (*base.Response, *gortsplib.ServerStream, error) {
 	RTSPPlugin.Debug("describe request")
 	var suber RTSPSubscriber
+	suber.server = conf.server
 	suber.RemoteAddr = ctx.Conn.NetConn().RemoteAddr().String()
 	suber.SetIO(ctx.Conn.NetConn())
 	streamPath := ctx.Path
@@ -100,8 +103,8 @@ func (conf *RTSPConfig) OnAnnounce(ctx *gortsplib.ServerHandlerOnAnnounceCtx) (*
 	p := &RTSPPublisher{}
 	p.SetIO(ctx.Conn.NetConn())
 	if err := RTSPPlugin.Publish(ctx.Path, p); err == nil {
-		p.tracks = ctx.Medias
-		p.stream = gortsplib.NewServerStream(ctx.Medias)
+		p.session = ctx.Description
+		p.stream = gortsplib.NewServerStream(conf.server, ctx.Description)
 		if err = p.SetTracks(); err != nil {
 			return nil, err
 		}
diff --git a/subscriber.go b/subscriber.go
index cad13fb..1dc73d1 100644
--- a/subscriber.go
+++ b/subscriber.go
@@ -1,10 +1,10 @@
 package rtsp
 
 import (
-	"github.com/bluenviron/gortsplib/v3"
+	"github.com/bluenviron/gortsplib/v4"
+	"github.com/bluenviron/gortsplib/v4/pkg/description"
+	"github.com/bluenviron/gortsplib/v4/pkg/format"
 	"github.com/bluenviron/mediacommon/pkg/codecs/mpeg4audio"
-	"github.com/bluenviron/gortsplib/v3/pkg/formats"
-	"github.com/bluenviron/gortsplib/v3/pkg/media"
 	. "m7s.live/engine/v4"
 	"m7s.live/engine/v4/codec"
 	"m7s.live/engine/v4/track"
@@ -23,9 +23,9 @@ func (s *RTSPSubscriber) OnEvent(event any) {
 		}
 		switch v.CodecID {
 		case codec.CodecID_H264:
-			video := &media.Media{
-				Type: media.TypeVideo,
-				Formats: []formats.Format{&formats.H264{
+			video := &description.Media{
+				Type: description.MediaTypeVideo,
+				Formats: []format.Format{&format.H264{
 					PacketizationMode: 1,
 					PayloadTyp:        v.PayloadType,
 					SPS:               v.ParamaterSets[0],
@@ -35,9 +35,9 @@ func (s *RTSPSubscriber) OnEvent(event any) {
 			s.videoTrack = video
 			s.tracks = append(s.tracks, video)
 		case codec.CodecID_H265:
-			video := &media.Media{
-				Type: media.TypeVideo,
-				Formats: []formats.Format{&formats.H265{
+			video := &description.Media{
+				Type: description.MediaTypeVideo,
+				Formats: []format.Format{&format.H265{
 					PayloadTyp: v.PayloadType,
 					VPS:        v.ParamaterSets[0],
 					SPS:        v.ParamaterSets[1],
@@ -54,9 +54,9 @@ func (s *RTSPSubscriber) OnEvent(event any) {
 		}
 		switch v.CodecID {
 		case codec.CodecID_AAC:
-			audio := &media.Media{
-				Type: media.TypeAudio,
-				Formats: []formats.Format{&formats.MPEG4Audio{
+			audio := &description.Media{
+				Type: description.MediaTypeAudio,
+				Formats: []format.Format{&format.MPEG4Audio{
 					PayloadTyp: v.PayloadType,
 					Config: &mpeg4audio.Config{
 						Type:         mpeg4audio.ObjectTypeAACLC,
@@ -71,16 +71,16 @@ func (s *RTSPSubscriber) OnEvent(event any) {
 			s.audioTrack = audio
 			s.tracks = append(s.tracks, audio)
 		case codec.CodecID_PCMA:
-			audio := &media.Media{
-				Type:    media.TypeAudio,
-				Formats: []formats.Format{&formats.G711{}},
+			audio := &description.Media{
+				Type:    description.MediaTypeAudio,
+				Formats: []format.Format{&format.G711{}},
 			}
 			s.audioTrack = audio
 			s.tracks = append(s.tracks, audio)
 		case codec.CodecID_PCMU:
-			audio := &media.Media{
-				Type: media.TypeAudio,
-				Formats: []formats.Format{&formats.G711{
+			audio := &description.Media{
+				Type: description.MediaTypeAudio,
+				Formats: []format.Format{&format.G711{
 					MULaw: true,
 				}},
 			}
@@ -89,7 +89,12 @@ func (s *RTSPSubscriber) OnEvent(event any) {
 		}
 		s.AddTrack(v)
 	case ISubscriber:
-		s.stream = gortsplib.NewServerStream(s.tracks)
+		s.session = &description.Session{
+			Medias:  s.tracks,
+		}
+		if s.server != nil {
+			s.stream = gortsplib.NewServerStream(s.server, s.session)
+		}
 	case VideoRTP:
 		s.stream.WritePacketRTP(s.videoTrack, v.Packet)
 	case AudioRTP: