diff --git a/client.go b/client.go
index 90446cb2..83f4c60c 100644
--- a/client.go
+++ b/client.go
@@ -1,6 +1,5 @@
 /*
-Package gortsplib is a RTSP 1.0 library for the Go programming language,
-written for rtsp-simple-server.
+Package gortsplib is a RTSP 1.0 library for the Go programming language.
 
 Examples are available at https://github.com/bluenviron/gortsplib/tree/main/examples
 */
@@ -10,6 +9,7 @@ import (
 	"context"
 	"crypto/tls"
 	"fmt"
+	"log"
 	"net"
 	"strconv"
 	"strings"
@@ -388,14 +388,17 @@ func (c *Client) Start(scheme string, host string) error {
 	}
 	if c.OnTransportSwitch == nil {
 		c.OnTransportSwitch = func(err error) {
+			log.Println(err.Error())
 		}
 	}
 	if c.OnPacketLost == nil {
 		c.OnPacketLost = func(err error) {
+			log.Println(err.Error())
 		}
 	}
 	if c.OnDecodeError == nil {
 		c.OnDecodeError = func(err error) {
+			log.Println(err.Error())
 		}
 	}
 
diff --git a/server_session.go b/server_session.go
index f39f5f80..4de879ee 100644
--- a/server_session.go
+++ b/server_session.go
@@ -3,6 +3,7 @@ package gortsplib
 import (
 	"context"
 	"fmt"
+	"log"
 	"net"
 	"strconv"
 	"strings"
@@ -280,6 +281,8 @@ func (ss *ServerSession) onPacketLost(err error) {
 			Session: ss,
 			Error:   err,
 		})
+	} else {
+		log.Println(err.Error())
 	}
 }
 
@@ -289,6 +292,8 @@ func (ss *ServerSession) onDecodeError(err error) {
 			Session: ss,
 			Error:   err,
 		})
+	} else {
+		log.Println(err.Error())
 	}
 }