diff --git a/README.md b/README.md
index cb103fe3..78454618 100644
--- a/README.md
+++ b/README.md
@@ -155,7 +155,7 @@ WARNING: RTSP is a plain protocol, and the credentials can be intercepted and re
 
 #### Client count
 
-The current number of clients, publishers and receivers is printed in each log line; for instance, the line:
+The current number of clients, publishers and readers is printed in each log line; for instance, the line:
 ```
 2020/01/01 00:00:00 [2/1/1] [client 127.0.0.1:44428] OPTION
 ```
diff --git a/conf.go b/conf.go
index 87073787..69487897 100644
--- a/conf.go
+++ b/conf.go
@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"io"
+	"net/url"
 	"os"
 	"regexp"
 	"time"
@@ -12,18 +13,20 @@ import (
 )
 
 type ConfPath struct {
-	Source           string   `yaml:"source"`
-	SourceProtocol   string   `yaml:"sourceProtocol"`
-	PublishUser      string   `yaml:"publishUser"`
-	PublishPass      string   `yaml:"publishPass"`
-	PublishIps       []string `yaml:"publishIps"`
-	publishIpsParsed []interface{}
-	ReadUser         string   `yaml:"readUser"`
-	ReadPass         string   `yaml:"readPass"`
-	ReadIps          []string `yaml:"readIps"`
-	readIpsParsed    []interface{}
-	RunOnPublish     string `yaml:"runOnPublish"`
-	RunOnRead        string `yaml:"runOnRead"`
+	Source               string `yaml:"source"`
+	sourceUrl            *url.URL
+	SourceProtocol       string `yaml:"sourceProtocol"`
+	sourceProtocolParsed gortsplib.StreamProtocol
+	PublishUser          string   `yaml:"publishUser"`
+	PublishPass          string   `yaml:"publishPass"`
+	PublishIps           []string `yaml:"publishIps"`
+	publishIpsParsed     []interface{}
+	ReadUser             string   `yaml:"readUser"`
+	ReadPass             string   `yaml:"readPass"`
+	ReadIps              []string `yaml:"readIps"`
+	readIpsParsed        []interface{}
+	RunOnPublish         string `yaml:"runOnPublish"`
+	RunOnRead            string `yaml:"runOnRead"`
 }
 
 type conf struct {
@@ -198,6 +201,36 @@ func loadConf(fpath string, stdin io.Reader) (*conf, error) {
 			if pconf.SourceProtocol == "" {
 				pconf.SourceProtocol = "udp"
 			}
+
+			pconf.sourceUrl, err = url.Parse(pconf.Source)
+			if err != nil {
+				return nil, fmt.Errorf("'%s' is not a valid RTSP url", pconf.Source)
+			}
+			if pconf.sourceUrl.Scheme != "rtsp" {
+				return nil, fmt.Errorf("'%s' is not a valid RTSP url", pconf.Source)
+			}
+			if pconf.sourceUrl.Port() == "" {
+				pconf.sourceUrl.Host += ":554"
+			}
+			if pconf.sourceUrl.User != nil {
+				pass, _ := pconf.sourceUrl.User.Password()
+				user := pconf.sourceUrl.User.Username()
+				if user != "" && pass == "" ||
+					user == "" && pass != "" {
+					fmt.Errorf("username and password must be both provided")
+				}
+			}
+
+			switch pconf.SourceProtocol {
+			case "udp":
+				pconf.sourceProtocolParsed = gortsplib.StreamProtocolUdp
+
+			case "tcp":
+				pconf.sourceProtocolParsed = gortsplib.StreamProtocolTcp
+
+			default:
+				return nil, fmt.Errorf("unsupported protocol '%s'", pconf.SourceProtocol)
+			}
 		}
 	}
 
diff --git a/go.mod b/go.mod
index 8939e88d..cc36b0ac 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module rtsp-simple-server
 
-go 1.13
+go 1.12
 
 require (
 	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
diff --git a/main.go b/main.go
index 0f833e02..7f7f87a2 100644
--- a/main.go
+++ b/main.go
@@ -162,20 +162,20 @@ type program struct {
 	sources        []*source
 	publishers     map[string]publisher
 	publisherCount int
-	receiverCount  int
+	readerCount    int
 
 	events chan programEvent
 	done   chan struct{}
 }
 
-func newProgram(sargs []string, stdin io.Reader) (*program, error) {
+func newProgram(args []string, stdin io.Reader) (*program, error) {
 	k := kingpin.New("rtsp-simple-server",
 		"rtsp-simple-server "+Version+"\n\nRTSP server.")
 
 	argVersion := k.Flag("version", "print version").Bool()
 	argConfPath := k.Arg("confpath", "path to a config file. The default is rtsp-simple-server.yml. Use 'stdin' to read config from stdin").Default("rtsp-simple-server.yml").String()
 
-	kingpin.MustParse(k.Parse(sargs))
+	kingpin.MustParse(k.Parse(args))
 
 	if *argVersion == true {
 		fmt.Println(Version)
@@ -197,11 +197,7 @@ func newProgram(sargs []string, stdin io.Reader) (*program, error) {
 
 	for path, pconf := range conf.Paths {
 		if pconf.Source != "record" {
-			s, err := newSource(p, path, pconf.Source, pconf.SourceProtocol)
-			if err != nil {
-				return nil, err
-			}
-
+			s := newSource(p, path, pconf.sourceUrl, pconf.sourceProtocolParsed)
 			p.sources = append(p.sources, s)
 			p.publishers[path] = s
 		}
@@ -249,7 +245,7 @@ func newProgram(sargs []string, stdin io.Reader) (*program, error) {
 
 func (p *program) log(format string, args ...interface{}) {
 	log.Printf("[%d/%d/%d] "+format, append([]interface{}{len(p.clients),
-		p.publisherCount, p.receiverCount}, args...)...)
+		p.publisherCount, p.readerCount}, args...)...)
 }
 
 func (p *program) run() {
@@ -349,12 +345,12 @@ outer:
 			evt.res <- nil
 
 		case programEventClientPlay2:
-			p.receiverCount += 1
+			p.readerCount += 1
 			evt.client.state = clientStatePlay
 			close(evt.done)
 
 		case programEventClientPlayStop:
-			p.receiverCount -= 1
+			p.readerCount -= 1
 			evt.client.state = clientStatePrePlay
 			close(evt.done)
 
diff --git a/source.go b/source.go
index 93d0a4c4..110a0af6 100644
--- a/source.go
+++ b/source.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"fmt"
 	"math/rand"
 	"net"
 	"net/url"
@@ -33,40 +32,7 @@ type source struct {
 	done      chan struct{}
 }
 
-func newSource(p *program, path string, sourceStr string, sourceProtocol string) (*source, error) {
-	u, err := url.Parse(sourceStr)
-	if err != nil {
-		return nil, fmt.Errorf("'%s' is not a valid RTSP url", sourceStr)
-	}
-	if u.Scheme != "rtsp" {
-		return nil, fmt.Errorf("'%s' is not a valid RTSP url", sourceStr)
-	}
-	if u.Port() == "" {
-		u.Host += ":554"
-	}
-	if u.User != nil {
-		pass, _ := u.User.Password()
-		user := u.User.Username()
-		if user != "" && pass == "" ||
-			user == "" && pass != "" {
-			fmt.Errorf("username and password must be both provided")
-		}
-	}
-
-	proto, err := func() (gortsplib.StreamProtocol, error) {
-		switch sourceProtocol {
-		case "udp":
-			return gortsplib.StreamProtocolUdp, nil
-
-		case "tcp":
-			return gortsplib.StreamProtocolTcp, nil
-		}
-		return gortsplib.StreamProtocol(0), fmt.Errorf("unsupported protocol '%s'", sourceProtocol)
-	}()
-	if err != nil {
-		return nil, err
-	}
-
+func newSource(p *program, path string, u *url.URL, proto gortsplib.StreamProtocol) *source {
 	s := &source{
 		p:         p,
 		path:      path,
@@ -76,7 +42,7 @@ func newSource(p *program, path string, sourceStr string, sourceProtocol string)
 		done:      make(chan struct{}),
 	}
 
-	return s, nil
+	return s
 }
 
 func (s *source) log(format string, args ...interface{}) {