diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index c875c137..9e496479 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -19,7 +19,7 @@ jobs:
 
     - uses: golangci/golangci-lint-action@v3
       with:
-        version: v1.50.1
+        version: v1.52.2
 
   go-mod-tidy:
     runs-on: ubuntu-20.04
diff --git a/Makefile b/Makefile
index 34e2ad84..d2fdf8ab 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 BASE_IMAGE = golang:1.20.1-alpine3.17
-LINT_IMAGE = golangci/golangci-lint:v1.50.1
+LINT_IMAGE = golangci/golangci-lint:v1.52.2
 
 .PHONY: $(shell ls)
 
diff --git a/client.go b/client.go
index 3a634417..994d72a4 100644
--- a/client.go
+++ b/client.go
@@ -481,7 +481,7 @@ func (c *Client) runInner() error {
 			req.res <- clientRes{res: res, err: err}
 
 		case req := <-c.play:
-			res, err := c.doPlay(req.ra, false)
+			res, err := c.doPlay(req.ra)
 			req.res <- clientRes{res: res, err: err}
 
 		case req := <-c.record:
@@ -607,7 +607,7 @@ func (c *Client) trySwitchingProtocol() error {
 		}
 	}
 
-	_, err = c.doPlay(c.lastRange, true)
+	_, err = c.doPlay(c.lastRange)
 	if err != nil {
 		return err
 	}
@@ -1423,7 +1423,7 @@ func (c *Client) SetupAll(medias media.Medias, baseURL *url.URL) error {
 	return nil
 }
 
-func (c *Client) doPlay(ra *headers.Range, isSwitchingProtocol bool) (*base.Response, error) {
+func (c *Client) doPlay(ra *headers.Range) (*base.Response, error) {
 	err := c.checkState(map[clientState]struct{}{
 		clientStatePrePlay: {},
 	})
diff --git a/client_media.go b/client_media.go
index 47c1d6fd..34f678c3 100644
--- a/client_media.go
+++ b/client_media.go
@@ -126,8 +126,8 @@ func (cm *clientMedia) start() {
 	}
 
 	if cm.udpRTPListener != nil {
-		cm.udpRTPListener.start(cm.c.state == clientStatePlay)
-		cm.udpRTCPListener.start(cm.c.state == clientStatePlay)
+		cm.udpRTPListener.start()
+		cm.udpRTCPListener.start()
 	}
 
 	for _, ct := range cm.formats {
@@ -241,7 +241,7 @@ func (cm *clientMedia) readRTCPTCPPlay(payload []byte) error {
 	return nil
 }
 
-func (cm *clientMedia) readRTPTCPRecord(payload []byte) error {
+func (cm *clientMedia) readRTPTCPRecord(_ []byte) error {
 	return nil
 }
 
@@ -323,7 +323,7 @@ func (cm *clientMedia) readRTCPUDPPlay(payload []byte) error {
 	return nil
 }
 
-func (cm *clientMedia) readRTPUDPRecord(payload []byte) error {
+func (cm *clientMedia) readRTPUDPRecord(_ []byte) error {
 	return nil
 }
 
diff --git a/client_udp_listener.go b/client_udp_listener.go
index 98d48b1b..f3069866 100644
--- a/client_udp_listener.go
+++ b/client_udp_listener.go
@@ -153,11 +153,11 @@ func (u *clientUDPListener) port() int {
 	return u.pc.LocalAddr().(*net.UDPAddr).Port
 }
 
-func (u *clientUDPListener) start(forPlay bool) {
+func (u *clientUDPListener) start() {
 	u.running = true
 	u.pc.SetReadDeadline(time.Time{})
 	u.readerDone = make(chan struct{})
-	go u.runReader(forPlay)
+	go u.runReader()
 }
 
 func (u *clientUDPListener) stop() {
@@ -165,7 +165,7 @@ func (u *clientUDPListener) stop() {
 	<-u.readerDone
 }
 
-func (u *clientUDPListener) runReader(forPlay bool) {
+func (u *clientUDPListener) runReader() {
 	defer close(u.readerDone)
 
 	var readFunc func([]byte) error
diff --git a/pkg/formats/av1.go b/pkg/formats/av1.go
index e73de756..47eac772 100644
--- a/pkg/formats/av1.go
+++ b/pkg/formats/av1.go
@@ -18,7 +18,7 @@ type AV1 struct {
 	Tier       *int
 }
 
-func (f *AV1) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+func (f *AV1) unmarshal(payloadType uint8, _ string, _ string, _ string, fmtp map[string]string) error {
 	f.PayloadTyp = payloadType
 
 	for key, val := range fmtp {
diff --git a/pkg/formats/g711.go b/pkg/formats/g711.go
index da8427d4..f201499b 100644
--- a/pkg/formats/g711.go
+++ b/pkg/formats/g711.go
@@ -13,7 +13,7 @@ type G711 struct {
 	MULaw bool
 }
 
-func (f *G711) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+func (f *G711) unmarshal(payloadType uint8, _ string, _ string, _ string, _ map[string]string) error {
 	f.MULaw = (payloadType == 0)
 	return nil
 }
diff --git a/pkg/formats/g722.go b/pkg/formats/g722.go
index 43ae702d..192b342d 100644
--- a/pkg/formats/g722.go
+++ b/pkg/formats/g722.go
@@ -10,7 +10,7 @@ import (
 // Specification: https://datatracker.ietf.org/doc/html/rfc3551
 type G722 struct{}
 
-func (f *G722) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+func (f *G722) unmarshal(_ uint8, _ string, _ string, _ string, _ map[string]string) error {
 	return nil
 }
 
diff --git a/pkg/formats/generic.go b/pkg/formats/generic.go
index 2e4a5b52..820832c7 100644
--- a/pkg/formats/generic.go
+++ b/pkg/formats/generic.go
@@ -57,20 +57,17 @@ type Generic struct {
 	RTPMa      string
 	FMT        map[string]string
 
-	// clock rate of the format. Filled automatically.
+	// clock rate of the format. Filled when calling Init().
 	ClockRat int
 }
 
-// Init computes the clock rate of the format. It it mandatory to call it.
+// Init computes the clock rate of the format. It is mandatory to call it.
 func (f *Generic) Init() error {
 	f.ClockRat, _ = findClockRate(f.PayloadTyp, f.RTPMa)
 	return nil
 }
 
-func (f *Generic) unmarshal(
-	payloadType uint8, clock string, codec string,
-	rtpmap string, fmtp map[string]string,
-) error {
+func (f *Generic) unmarshal(payloadType uint8, _ string, _ string, rtpmap string, fmtp map[string]string) error {
 	f.PayloadTyp = payloadType
 	f.RTPMa = rtpmap
 	f.FMT = fmtp
diff --git a/pkg/formats/h264.go b/pkg/formats/h264.go
index 9fd78a01..37526d29 100644
--- a/pkg/formats/h264.go
+++ b/pkg/formats/h264.go
@@ -81,7 +81,7 @@ type H264 struct {
 	mutex sync.RWMutex
 }
 
-func (f *H264) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+func (f *H264) unmarshal(payloadType uint8, _ string, _ string, _ string, fmtp map[string]string) error {
 	f.PayloadTyp = payloadType
 
 	for key, val := range fmtp {
diff --git a/pkg/formats/h265.go b/pkg/formats/h265.go
index e3d3a63f..9c3727b3 100644
--- a/pkg/formats/h265.go
+++ b/pkg/formats/h265.go
@@ -23,7 +23,7 @@ type H265 struct {
 	mutex sync.RWMutex
 }
 
-func (f *H265) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+func (f *H265) unmarshal(payloadType uint8, _ string, _ string, _ string, fmtp map[string]string) error {
 	f.PayloadTyp = payloadType
 
 	for key, val := range fmtp {
diff --git a/pkg/formats/lpcm.go b/pkg/formats/lpcm.go
index f342b9e9..b08728d0 100644
--- a/pkg/formats/lpcm.go
+++ b/pkg/formats/lpcm.go
@@ -18,7 +18,7 @@ type LPCM struct {
 	ChannelCount int
 }
 
-func (f *LPCM) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+func (f *LPCM) unmarshal(payloadType uint8, clock string, codec string, _ string, _ map[string]string) error {
 	f.PayloadTyp = payloadType
 
 	switch codec {
diff --git a/pkg/formats/mjpeg.go b/pkg/formats/mjpeg.go
index 0370a537..f627dc23 100644
--- a/pkg/formats/mjpeg.go
+++ b/pkg/formats/mjpeg.go
@@ -10,7 +10,7 @@ import (
 // Specification: https://datatracker.ietf.org/doc/html/rfc2435
 type MJPEG struct{}
 
-func (f *MJPEG) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+func (f *MJPEG) unmarshal(_ uint8, _ string, _ string, _ string, _ map[string]string) error {
 	return nil
 }
 
diff --git a/pkg/formats/mpeg2_audio.go b/pkg/formats/mpeg2_audio.go
index 5822de7a..4924423d 100644
--- a/pkg/formats/mpeg2_audio.go
+++ b/pkg/formats/mpeg2_audio.go
@@ -10,10 +10,7 @@ import (
 // Specification: https://datatracker.ietf.org/doc/html/rfc2250
 type MPEG2Audio struct{}
 
-func (f *MPEG2Audio) unmarshal(
-	payloadType uint8, clock string, codec string,
-	rtpmap string, fmtp map[string]string,
-) error {
+func (f *MPEG2Audio) unmarshal(_ uint8, _ string, _ string, _ string, _ map[string]string) error {
 	return nil
 }
 
diff --git a/pkg/formats/mpeg2_video.go b/pkg/formats/mpeg2_video.go
index 4ae5182e..774af0e3 100644
--- a/pkg/formats/mpeg2_video.go
+++ b/pkg/formats/mpeg2_video.go
@@ -8,10 +8,7 @@ import (
 // Specification: https://datatracker.ietf.org/doc/html/rfc2250
 type MPEG2Video struct{}
 
-func (f *MPEG2Video) unmarshal(
-	payloadType uint8, clock string, codec string,
-	rtpmap string, fmtp map[string]string,
-) error {
+func (f *MPEG2Video) unmarshal(_ uint8, _ string, _ string, _ string, _ map[string]string) error {
 	return nil
 }
 
diff --git a/pkg/formats/mpeg4_audio_generic.go b/pkg/formats/mpeg4_audio_generic.go
index dcc62d1a..cb0ead86 100644
--- a/pkg/formats/mpeg4_audio_generic.go
+++ b/pkg/formats/mpeg4_audio_generic.go
@@ -27,8 +27,8 @@ type MPEG4AudioGeneric struct {
 }
 
 func (f *MPEG4AudioGeneric) unmarshal(
-	payloadType uint8, clock string, codec string,
-	rtpmap string, fmtp map[string]string,
+	payloadType uint8, _ string, _ string,
+	_ string, fmtp map[string]string,
 ) error {
 	f.PayloadTyp = payloadType
 
diff --git a/pkg/formats/mpeg4_audio_latm.go b/pkg/formats/mpeg4_audio_latm.go
index 5ddfdc18..1c7a5359 100644
--- a/pkg/formats/mpeg4_audio_latm.go
+++ b/pkg/formats/mpeg4_audio_latm.go
@@ -21,8 +21,8 @@ type MPEG4AudioLATM struct {
 }
 
 func (f *MPEG4AudioLATM) unmarshal(
-	payloadType uint8, clock string, codec string,
-	rtpmap string, fmtp map[string]string,
+	payloadType uint8, _ string, _ string,
+	_ string, fmtp map[string]string,
 ) error {
 	f.PayloadTyp = payloadType
 	f.ProfileLevelID = 30 // default value defined by specification
diff --git a/pkg/formats/mpeg4_video_es.go b/pkg/formats/mpeg4_video_es.go
index f1e65fa6..896b4fdb 100644
--- a/pkg/formats/mpeg4_video_es.go
+++ b/pkg/formats/mpeg4_video_es.go
@@ -23,8 +23,8 @@ type MPEG4VideoES struct {
 }
 
 func (f *MPEG4VideoES) unmarshal(
-	payloadType uint8, clock string, codec string,
-	rtpmap string, fmtp map[string]string,
+	payloadType uint8, _ string, _ string,
+	_ string, fmtp map[string]string,
 ) error {
 	f.PayloadTyp = payloadType
 	f.ProfileLevelID = 1 // default value defined by specification
diff --git a/pkg/formats/mpegts.go b/pkg/formats/mpegts.go
index d057517c..f65d81a7 100644
--- a/pkg/formats/mpegts.go
+++ b/pkg/formats/mpegts.go
@@ -8,7 +8,7 @@ import (
 // Specification: https://datatracker.ietf.org/doc/html/rfc2250
 type MPEGTS struct{}
 
-func (f *MPEGTS) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+func (f *MPEGTS) unmarshal(_ uint8, _ string, _ string, _ string, _ map[string]string) error {
 	return nil
 }
 
diff --git a/pkg/formats/opus.go b/pkg/formats/opus.go
index 0753ca0b..07a99d8f 100644
--- a/pkg/formats/opus.go
+++ b/pkg/formats/opus.go
@@ -17,7 +17,7 @@ type Opus struct {
 	IsStereo   bool
 }
 
-func (f *Opus) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+func (f *Opus) unmarshal(payloadType uint8, clock string, _ string, _ string, fmtp map[string]string) error {
 	f.PayloadTyp = payloadType
 
 	tmp := strings.SplitN(clock, "/", 2)
diff --git a/pkg/formats/vorbis.go b/pkg/formats/vorbis.go
index 8287bf68..4ce35b52 100644
--- a/pkg/formats/vorbis.go
+++ b/pkg/formats/vorbis.go
@@ -18,7 +18,7 @@ type Vorbis struct {
 	Configuration []byte
 }
 
-func (f *Vorbis) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+func (f *Vorbis) unmarshal(payloadType uint8, clock string, _ string, _ string, fmtp map[string]string) error {
 	f.PayloadTyp = payloadType
 
 	tmp := strings.SplitN(clock, "/", 2)
diff --git a/pkg/formats/vp8.go b/pkg/formats/vp8.go
index e83a4260..9ff69772 100644
--- a/pkg/formats/vp8.go
+++ b/pkg/formats/vp8.go
@@ -17,7 +17,7 @@ type VP8 struct {
 	MaxFS      *int
 }
 
-func (f *VP8) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+func (f *VP8) unmarshal(payloadType uint8, _ string, _ string, _ string, fmtp map[string]string) error {
 	f.PayloadTyp = payloadType
 
 	for key, val := range fmtp {
diff --git a/pkg/formats/vp9.go b/pkg/formats/vp9.go
index ac085771..e7661bc2 100644
--- a/pkg/formats/vp9.go
+++ b/pkg/formats/vp9.go
@@ -18,7 +18,7 @@ type VP9 struct {
 	ProfileID  *int
 }
 
-func (f *VP9) unmarshal(payloadType uint8, clock string, codec string, rtpmap string, fmtp map[string]string) error {
+func (f *VP9) unmarshal(payloadType uint8, _ string, _ string, _ string, fmtp map[string]string) error {
 	f.PayloadTyp = payloadType
 
 	for key, val := range fmtp {
diff --git a/pkg/headers/keyval.go b/pkg/headers/keyval.go
index 07229c01..11515971 100644
--- a/pkg/headers/keyval.go
+++ b/pkg/headers/keyval.go
@@ -4,7 +4,7 @@ import (
 	"fmt"
 )
 
-func readKey(origstr string, str string, separator byte) (string, string) {
+func readKey(str string, separator byte) (string, string) {
 	i := 0
 	for {
 		if i >= len(str) || str[i] == '=' || str[i] == separator {
@@ -47,7 +47,7 @@ func keyValParse(str string, separator byte) (map[string]string, error) {
 
 	for len(str) > 0 {
 		var k string
-		k, str = readKey(origstr, str, separator)
+		k, str = readKey(str, separator)
 
 		if len(k) > 0 {
 			if len(str) > 0 && str[0] == '=' {
diff --git a/server_conn.go b/server_conn.go
index 356ec22f..068e9f20 100644
--- a/server_conn.go
+++ b/server_conn.go
@@ -26,10 +26,10 @@ func getSessionID(header base.Header) string {
 
 func mediasForSDP(
 	medias media.Medias,
-	streamMedias map[*media.Media]*serverStreamMedia,
 	contentBase *url.URL,
 ) media.Medias {
-	copy := make(media.Medias, len(medias))
+	newMedias := make(media.Medias, len(medias))
+
 	for i, medi := range medias {
 		mc := &media.Media{
 			Type: medi.Type,
@@ -47,9 +47,10 @@ func mediasForSDP(
 		u, _ := mc.URL(contentBase)
 		mc.Control = u.String()
 
-		copy[i] = mc
+		newMedias[i] = mc
 	}
-	return copy
+
+	return newMedias
 }
 
 type readReq struct {
@@ -294,7 +295,7 @@ func (sc *ServerConn) handleRequestInner(req *base.Request) (*base.Response, err
 				}
 
 				if stream != nil {
-					byts, _ := mediasForSDP(stream.medias, stream.streamMedias, req.URL).Marshal(multicast).Marshal()
+					byts, _ := mediasForSDP(stream.medias, req.URL).Marshal(multicast).Marshal()
 					res.Body = byts
 				}
 			}
diff --git a/server_conn_reader.go b/server_conn_reader.go
index 5566e315..70b15c9d 100644
--- a/server_conn_reader.go
+++ b/server_conn_reader.go
@@ -68,12 +68,12 @@ func (cr *serverConnReader) readFuncStandard() error {
 	cr.sc.nconn.SetReadDeadline(time.Time{})
 
 	for {
-		any, err := cr.sc.conn.ReadInterleavedFrameOrRequest()
+		what, err := cr.sc.conn.ReadInterleavedFrameOrRequest()
 		if err != nil {
 			return err
 		}
 
-		switch what := any.(type) {
+		switch what := what.(type) {
 		case *base.Request:
 			cres := make(chan error)
 			req := readReq{req: what, res: cres}
diff --git a/server_record_test.go b/server_record_test.go
index eba73ed0..d469f8b7 100644
--- a/server_record_test.go
+++ b/server_record_test.go
@@ -66,7 +66,8 @@ func invalidURLAnnounceReq(t *testing.T, control string) base.Request {
 		MediaDescriptions: []*psdp.MediaDescription{medi.Marshal()},
 	}
 
-	byts, _ := sout.Marshal()
+	byts, err := sout.Marshal()
+	require.NoError(t, err)
 
 	return base.Request{
 		Method: base.Announce,
diff --git a/server_session_media.go b/server_session_media.go
index b534b7e3..0bc7ad07 100644
--- a/server_session_media.go
+++ b/server_session_media.go
@@ -240,7 +240,7 @@ func (sm *serverSessionMedia) readRTCPUDPRecord(payload []byte) error {
 	return nil
 }
 
-func (sm *serverSessionMedia) readRTPTCPPlay(payload []byte) error {
+func (sm *serverSessionMedia) readRTPTCPPlay(_ []byte) error {
 	return nil
 }
 
diff --git a/server_test.go b/server_test.go
index 349332e0..d59f782f 100644
--- a/server_test.go
+++ b/server_test.go
@@ -323,7 +323,7 @@ type testServerErrMethodNotImplemented struct {
 }
 
 func (s *testServerErrMethodNotImplemented) OnDescribe(
-	ctx *ServerHandlerOnDescribeCtx,
+	_ *ServerHandlerOnDescribeCtx,
 ) (*base.Response, *ServerStream, error) {
 	return &base.Response{
 		StatusCode: base.StatusOK,
@@ -331,7 +331,7 @@ func (s *testServerErrMethodNotImplemented) OnDescribe(
 }
 
 func (s *testServerErrMethodNotImplemented) OnSetup(
-	ctx *ServerHandlerOnSetupCtx,
+	_ *ServerHandlerOnSetupCtx,
 ) (*base.Response, *ServerStream, error) {
 	return &base.Response{
 		StatusCode: base.StatusOK,