diff --git a/internal/streams/add_consumer.go b/internal/streams/add_consumer.go
new file mode 100644
index 00000000..d97a4266
--- /dev/null
+++ b/internal/streams/add_consumer.go
@@ -0,0 +1,149 @@
+package streams
+
+import (
+	"errors"
+	"strings"
+	"sync/atomic"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+)
+
+func (s *Stream) AddConsumer(cons core.Consumer) (err error) {
+	// support for multiple simultaneous requests from different consumers
+	consN := atomic.AddInt32(&s.requests, 1) - 1
+
+	var prodErrors []error
+	var prodMedias []*core.Media
+	var prods []*Producer // matched producers for consumer
+
+	// Step 1. Get consumer medias
+	consMedias := cons.GetMedias()
+	for _, consMedia := range consMedias {
+		log.Trace().Msgf("[streams] check cons=%d media=%s", consN, consMedia)
+
+	producers:
+		for prodN, prod := range s.producers {
+			if err = prod.Dial(); err != nil {
+				log.Trace().Err(err).Msgf("[streams] skip prod=%s", prod.url)
+				prodErrors = append(prodErrors, err)
+				continue
+			}
+
+			// Step 2. Get producer medias (not tracks yet)
+			for _, prodMedia := range prod.GetMedias() {
+				log.Trace().Msgf("[streams] check prod=%d media=%s", prodN, prodMedia)
+				prodMedias = append(prodMedias, prodMedia)
+
+				// Step 3. Match consumer/producer codecs list
+				prodCodec, consCodec := prodMedia.MatchMedia(consMedia)
+				if prodCodec == nil {
+					continue
+				}
+
+				var track *core.Receiver
+
+				switch prodMedia.Direction {
+				case core.DirectionRecvonly:
+					log.Trace().Msgf("[streams] match prod=%d => cons=%d", prodN, consN)
+
+					// Step 4. Get recvonly track from producer
+					if track, err = prod.GetTrack(prodMedia, prodCodec); err != nil {
+						log.Info().Err(err).Msg("[streams] can't get track")
+						continue
+					}
+					// Step 5. Add track to consumer
+					if err = cons.AddTrack(consMedia, consCodec, track); err != nil {
+						log.Info().Err(err).Msg("[streams] can't add track")
+						continue
+					}
+
+				case core.DirectionSendonly:
+					log.Trace().Msgf("[streams] match cons=%d => prod=%d", consN, prodN)
+
+					// Step 4. Get recvonly track from consumer (backchannel)
+					if track, err = cons.(core.Producer).GetTrack(consMedia, consCodec); err != nil {
+						log.Info().Err(err).Msg("[streams] can't get track")
+						continue
+					}
+					// Step 5. Add track to producer
+					if err = prod.AddTrack(prodMedia, prodCodec, track); err != nil {
+						log.Info().Err(err).Msg("[streams] can't add track")
+						continue
+					}
+				}
+
+				prods = append(prods, prod)
+
+				if !consMedia.MatchAll() {
+					break producers
+				}
+			}
+		}
+	}
+
+	// stop producers if they don't have readers
+	if atomic.AddInt32(&s.requests, -1) == 0 {
+		s.stopProducers()
+	}
+
+	if len(prods) == 0 {
+		return formatError(consMedias, prodMedias, prodErrors)
+	}
+
+	s.mu.Lock()
+	s.consumers = append(s.consumers, cons)
+	s.mu.Unlock()
+
+	// there may be duplicates, but that's not a problem
+	for _, prod := range prods {
+		prod.start()
+	}
+
+	return nil
+}
+
+func formatError(consMedias, prodMedias []*core.Media, prodErrors []error) error {
+	if prodMedias != nil {
+		var prod, cons string
+
+		for _, media := range prodMedias {
+			if media.Direction == core.DirectionRecvonly {
+				for _, codec := range media.Codecs {
+					prod = appendString(prod, codec.PrintName())
+				}
+			}
+		}
+
+		for _, media := range consMedias {
+			if media.Direction == core.DirectionSendonly {
+				for _, codec := range media.Codecs {
+					cons = appendString(cons, codec.PrintName())
+				}
+			}
+		}
+
+		return errors.New("streams: codecs not matched: " + prod + " => " + cons)
+	}
+
+	if prodErrors != nil {
+		var text string
+
+		for _, err := range prodErrors {
+			text = appendString(text, err.Error())
+		}
+
+		return errors.New("streams: " + text)
+	}
+
+	return errors.New("streams: unknown error")
+}
+
+func appendString(s, elem string) string {
+	if strings.Contains(s, elem) {
+		return s
+	}
+	if len(s) == 0 {
+		return elem
+	}
+	return s + ", " + elem
+}
diff --git a/internal/streams/stream.go b/internal/streams/stream.go
index c918aaba..75b855b8 100644
--- a/internal/streams/stream.go
+++ b/internal/streams/stream.go
@@ -2,10 +2,7 @@ package streams
 
 import (
 	"encoding/json"
-	"errors"
-	"strings"
 	"sync"
-	"sync/atomic"
 
 	"github.com/AlexxIT/go2rtc/pkg/core"
 )
@@ -51,99 +48,6 @@ func (s *Stream) SetSource(source string) {
 	}
 }
 
-func (s *Stream) AddConsumer(cons core.Consumer) (err error) {
-	// support for multiple simultaneous requests from different consumers
-	consN := atomic.AddInt32(&s.requests, 1) - 1
-
-	var statErrors []error
-	var statMedias []*core.Media
-	var statProds []*Producer // matched producers for consumer
-
-	// Step 1. Get consumer medias
-	for _, consMedia := range cons.GetMedias() {
-		log.Trace().Msgf("[streams] check cons=%d media=%s", consN, consMedia)
-
-	producers:
-		for prodN, prod := range s.producers {
-			if err = prod.Dial(); err != nil {
-				log.Trace().Err(err).Msgf("[streams] skip prod=%s", prod.url)
-				statErrors = append(statErrors, err)
-				continue
-			}
-
-			// Step 2. Get producer medias (not tracks yet)
-			for _, prodMedia := range prod.GetMedias() {
-				log.Trace().Msgf("[streams] check prod=%d media=%s", prodN, prodMedia)
-				statMedias = append(statMedias, prodMedia)
-
-				// Step 3. Match consumer/producer codecs list
-				prodCodec, consCodec := prodMedia.MatchMedia(consMedia)
-				if prodCodec == nil {
-					continue
-				}
-
-				var track *core.Receiver
-
-				switch prodMedia.Direction {
-				case core.DirectionRecvonly:
-					log.Trace().Msgf("[streams] match prod=%d => cons=%d", prodN, consN)
-
-					// Step 4. Get recvonly track from producer
-					if track, err = prod.GetTrack(prodMedia, prodCodec); err != nil {
-						log.Info().Err(err).Msg("[streams] can't get track")
-						continue
-					}
-					// Step 5. Add track to consumer
-					if err = cons.AddTrack(consMedia, consCodec, track); err != nil {
-						log.Info().Err(err).Msg("[streams] can't add track")
-						continue
-					}
-
-				case core.DirectionSendonly:
-					log.Trace().Msgf("[streams] match cons=%d => prod=%d", consN, prodN)
-
-					// Step 4. Get recvonly track from consumer (backchannel)
-					if track, err = cons.(core.Producer).GetTrack(consMedia, consCodec); err != nil {
-						log.Info().Err(err).Msg("[streams] can't get track")
-						continue
-					}
-					// Step 5. Add track to producer
-					if err = prod.AddTrack(prodMedia, prodCodec, track); err != nil {
-						log.Info().Err(err).Msg("[streams] can't add track")
-						continue
-					}
-				}
-
-				statProds = append(statProds, prod)
-
-				if !consMedia.MatchAll() {
-					break producers
-				}
-			}
-		}
-	}
-
-	// stop producers if they don't have readers
-	if atomic.AddInt32(&s.requests, -1) == 0 {
-		s.stopProducers()
-	}
-
-	if len(statProds) == 0 {
-		return formatError(statMedias, statErrors)
-	}
-
-	s.mu.Lock()
-	s.consumers = append(s.consumers, cons)
-	s.mu.Unlock()
-
-	// there may be duplicates, but that's not a problem
-	for _, prod := range statProds {
-		prod.start()
-	}
-
-	return nil
-}
-
 func (s *Stream) RemoveConsumer(cons core.Consumer) {
 	_ = cons.Stop()
 
@@ -213,52 +117,3 @@ func (s *Stream) MarshalJSON() ([]byte, error) {
 
 	return json.Marshal(info)
 }
-
-func formatError(statMedias []*core.Media, statErrors []error) error {
-	var text string
-
-	if statMedias == nil {
-		return errors.New("can't get medias for stream")
-	}
-
-	for _, media := range statMedias {
-		if media.Direction == core.DirectionRecvonly {
-			continue
-		}
-
-		for _, codec := range media.Codecs {
-			name := codec.Name
-			if name == core.CodecAAC {
-				name = "AAC"
-			}
-			if strings.Contains(text, name) {
-				continue
-			}
-			if len(text) > 0 {
-				text += ","
-			}
-			text += name
-		}
-	}
-
-	if text != "" {
-		return errors.New(text)
-	}
-
-	for _, err := range statErrors {
-		s := err.Error()
-		if strings.Contains(text, s) {
-			continue
-		}
-		if len(text) > 0 {
-			text += ","
-		}
-		text += s
-	}
-
-	if text != "" {
-		return errors.New(text)
-	}
-
-	return errors.New("unknown error")
-}
diff --git a/pkg/core/codec.go b/pkg/core/codec.go
index 90af2c65..b48b629d 100644
--- a/pkg/core/codec.go
+++ b/pkg/core/codec.go
@@ -64,6 +64,20 @@ func (c *Codec) Kind() string {
 	return GetKind(c.Name)
 }
 
+func (c *Codec) PrintName() string {
+	switch c.Name {
+	case CodecAAC:
+		return "AAC"
+	case CodecELD:
+		return "AAC-ELD"
+	case CodecPCM:
+		return "PCM-S16BE"
+	case CodecPCML:
+		return "PCM-S16LE"
+	}
+	return c.Name
+}
+
 func (c *Codec) Clone() *Codec {
 	clone := *c
 	return &clone