diff --git a/pkg/aac/adts.go b/pkg/aac/adts.go
index 45d3167e..e38b4c42 100644
--- a/pkg/aac/adts.go
+++ b/pkg/aac/adts.go
@@ -40,7 +40,7 @@ func ADTSToCodec(b []byte) *core.Codec {
 	//_ = rd.ReadBits(16) // CRC check
 
 	// 3. Encode RTP config
-	wr := bits.NewWriter()
+	wr := bits.NewWriter(nil)
 	wr.WriteBits8(objType, 5)
 	wr.WriteBits8(sampleRateIdx, 4)
 	wr.WriteBits16(channels, 4)
diff --git a/pkg/core/core.go b/pkg/core/core.go
index e663ac75..10a435d3 100644
--- a/pkg/core/core.go
+++ b/pkg/core/core.go
@@ -47,7 +47,10 @@ type Producer interface {
 	// GetTrack - return Receiver, that can only produce rtp.Packet(s)
 	GetTrack(media *Media, codec *Codec) (*Receiver, error)
 
+	// Deprecated: rename to Run()
 	Start() error
+
+	// Deprecated: rename to Close()
 	Stop() error
 }
 
@@ -59,6 +62,7 @@ type Consumer interface {
 
 	AddTrack(media *Media, codec *Codec, track *Receiver) error
 
+	// Deprecated: rename to Close()
 	Stop() error
 }
 
@@ -102,3 +106,60 @@ const (
 	UnsupportedCodec    = "unsupported codec"
 	WrongMediaDirection = "wrong media direction"
 )
+
+type SuperProducer struct {
+	Type      string      `json:"type,omitempty"`
+	URL       string      `json:"url,omitempty"`
+	Medias    []*Media    `json:"medias,omitempty"`
+	Receivers []*Receiver `json:"receivers,omitempty"`
+	Recv      int         `json:"recv,omitempty"`
+}
+
+func (s *SuperProducer) GetMedias() []*Media {
+	return s.Medias
+}
+
+func (s *SuperProducer) GetTrack(media *Media, codec *Codec) (*Receiver, error) {
+	for _, receiver := range s.Receivers {
+		if receiver.Codec == codec {
+			return receiver, nil
+		}
+	}
+	receiver := NewReceiver(media, codec)
+	s.Receivers = append(s.Receivers, receiver)
+	return receiver, nil
+}
+
+func (s *SuperProducer) Close() error {
+	for _, receiver := range s.Receivers {
+		receiver.Close()
+	}
+	return nil
+}
+
+type SuperConsumer struct {
+	Type    string    `json:"type,omitempty"`
+	URL     string    `json:"url,omitempty"`
+	Medias  []*Media  `json:"medias,omitempty"`
+	Senders []*Sender `json:"receivers,omitempty"`
+	Send    int       `json:"recv,omitempty"`
+}
+
+func (s *SuperConsumer) GetMedias() []*Media {
+	return s.Medias
+}
+
+func (s *SuperConsumer) AddTrack(media *Media, codec *Codec, track *Receiver) error {
+	return nil
+}
+
+//func (b *SuperConsumer) WriteTo(w io.Writer) (n int64, err error) {
+//	return 0, nil
+//}
+
+func (s *SuperConsumer) Close() error {
+	for _, sender := range s.Senders {
+		sender.Close()
+	}
+	return nil
+}
diff --git a/pkg/core/readseeker.go b/pkg/core/readbuffer.go
similarity index 75%
rename from pkg/core/readseeker.go
rename to pkg/core/readbuffer.go
index 5eff128f..59161c83 100644
--- a/pkg/core/readseeker.go
+++ b/pkg/core/readbuffer.go
@@ -12,13 +12,13 @@ const (
 	BufferDrainAndClear = -1
 )
 
-// ReadSeeker support buffering and Seek over buffer
+// ReadBuffer support buffering and Seek over buffer
 // positive BufferSize will enable buffering mode
 // Seek to negative offset will clear buffer
 // Seek with a positive BufferSize will continue buffering after the last read from the buffer
 // Seek with a negative BufferSize will clear buffer after the last read from the buffer
 // Read more than BufferSize will raise error
-type ReadSeeker struct {
+type ReadBuffer struct {
 	io.Reader
 
 	BufferSize int
@@ -27,14 +27,14 @@ type ReadSeeker struct {
 	pos int
 }
 
-func NewReadSeeker(rd io.Reader) *ReadSeeker {
-	if rs, ok := rd.(*ReadSeeker); ok {
+func NewReadBuffer(rd io.Reader) *ReadBuffer {
+	if rs, ok := rd.(*ReadBuffer); ok {
 		return rs
 	}
-	return &ReadSeeker{Reader: rd}
+	return &ReadBuffer{Reader: rd}
 }
 
-func (r *ReadSeeker) Read(p []byte) (n int, err error) {
+func (r *ReadBuffer) Read(p []byte) (n int, err error) {
 	// with zero buffer - read as usual
 	if r.BufferSize == BufferDisable {
 		return r.Reader.Read(p)
@@ -65,7 +65,14 @@ func (r *ReadSeeker) Read(p []byte) (n int, err error) {
 	return
 }
 
-func (r *ReadSeeker) Seek(offset int64, whence int) (int64, error) {
+func (r *ReadBuffer) Close() error {
+	if closer, ok := r.Reader.(io.Closer); ok {
+		return closer.Close()
+	}
+	return nil
+}
+
+func (r *ReadBuffer) Seek(offset int64, whence int) (int64, error) {
 	var pos int
 	switch whence {
 	case io.SeekStart:
@@ -89,17 +96,17 @@ func (r *ReadSeeker) Seek(offset int64, whence int) (int64, error) {
 	return int64(r.pos), nil
 }
 
-func (r *ReadSeeker) Peek(n int) ([]byte, error) {
+func (r *ReadBuffer) Peek(n int) ([]byte, error) {
 	r.BufferSize = n
 	b := make([]byte, n)
 	if _, err := io.ReadAtLeast(r, b, n); err != nil {
 		return nil, err
 	}
-	r.Rewind()
+	r.Reset()
 	return b, nil
 }
 
-func (r *ReadSeeker) Rewind() {
+func (r *ReadBuffer) Reset() {
 	r.BufferSize = BufferDrainAndClear
 	r.pos = 0
 }
diff --git a/pkg/core/readseeker_test.go b/pkg/core/readbuffer_test.go
similarity index 97%
rename from pkg/core/readseeker_test.go
rename to pkg/core/readbuffer_test.go
index 69080c52..01472170 100644
--- a/pkg/core/readseeker_test.go
+++ b/pkg/core/readbuffer_test.go
@@ -12,7 +12,7 @@ func TestReadSeeker(t *testing.T) {
 	b := []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
 	buf := bytes.NewReader(b)
 
-	rd := NewReadSeeker(buf)
+	rd := NewReadBuffer(buf)
 	rd.BufferSize = ProbeSize
 
 	// 1. Read to buffer
diff --git a/pkg/flv/client.go b/pkg/flv/client.go
index 9fe18430..bb2c783f 100644
--- a/pkg/flv/client.go
+++ b/pkg/flv/client.go
@@ -18,7 +18,7 @@ const Signature = "FLV"
 type Client struct {
 	URL string
 
-	rd *core.ReadSeeker
+	rd *core.ReadBuffer
 
 	medias    []*core.Media
 	receivers []*core.Receiver
@@ -30,7 +30,7 @@ type Client struct {
 
 func Open(rd io.Reader) (*Client, error) {
 	client := &Client{
-		rd: core.NewReadSeeker(rd),
+		rd: core.NewReadBuffer(rd),
 	}
 	if err := client.describe(); err != nil {
 		return nil, err
@@ -53,7 +53,7 @@ func (c *Client) describe() error {
 	}
 
 	c.rd.BufferSize = core.ProbeSize
-	defer c.rd.Rewind()
+	defer c.rd.Reset()
 
 	// Normal software sends:
 	// 1. Video/audio flag in header
diff --git a/pkg/h264/annexb/annexb.go b/pkg/h264/annexb/annexb.go
index b7e6bd5d..fcae18a4 100644
--- a/pkg/h264/annexb/annexb.go
+++ b/pkg/h264/annexb/annexb.go
@@ -70,8 +70,10 @@ func EncodeToAVCC(b []byte, safeAppend bool) []byte {
 	return b
 }
 
-func DecodeAVCC(b []byte) []byte {
-	b = bytes.Clone(b)
+func DecodeAVCC(b []byte, safeClone bool) []byte {
+	if safeClone {
+		b = bytes.Clone(b)
+	}
 	for i := 0; i < len(b); {
 		size := int(binary.BigEndian.Uint32(b[i:]))
 		b[i] = 0
diff --git a/pkg/magic/bitstream/client.go b/pkg/magic/bitstream/producer.go
similarity index 54%
rename from pkg/magic/bitstream/client.go
rename to pkg/magic/bitstream/producer.go
index 97bf7088..d6f7e72e 100644
--- a/pkg/magic/bitstream/client.go
+++ b/pkg/magic/bitstream/producer.go
@@ -2,7 +2,6 @@ package bitstream
 
 import (
 	"encoding/hex"
-	"encoding/json"
 	"errors"
 	"io"
 
@@ -13,17 +12,13 @@ import (
 	"github.com/pion/rtp"
 )
 
-type Client struct {
-	rd *core.ReadSeeker
-
-	media    *core.Media
-	receiver *core.Receiver
-
-	recv int
+type Producer struct {
+	core.SuperProducer
+	rd *core.ReadBuffer
 }
 
-func Open(r io.Reader) (*Client, error) {
-	rd := core.NewReadSeeker(r)
+func Open(r io.Reader) (*Producer, error) {
+	rd := core.NewReadBuffer(r)
 
 	buf, err := rd.Peek(256)
 	if err != nil {
@@ -43,30 +38,19 @@ func Open(r io.Reader) (*Client, error) {
 		return nil, errors.New("bitstream: unsupported header: " + hex.EncodeToString(buf[:8]))
 	}
 
-	client := &Client{
-		rd: rd,
-		media: &core.Media{
+	prod := &Producer{rd: rd}
+	prod.Type = "Bitstream producer"
+	prod.Medias = []*core.Media{
+		{
 			Kind:      core.KindVideo,
 			Direction: core.DirectionRecvonly,
 			Codecs:    []*core.Codec{codec},
 		},
 	}
-
-	return client, nil
+	return prod, nil
 }
 
-func (c *Client) GetMedias() []*core.Media {
-	return []*core.Media{c.media}
-}
-
-func (c *Client) GetTrack(media *core.Media, codec *core.Codec) (*core.Receiver, error) {
-	if c.receiver == nil {
-		c.receiver = core.NewReceiver(media, codec)
-	}
-	return c.receiver, nil
-}
-
-func (c *Client) Start() error {
+func (c *Producer) Start() error {
 	var buf []byte
 
 	b := make([]byte, core.BufferSize)
@@ -76,7 +60,7 @@ func (c *Client) Start() error {
 			return err
 		}
 
-		c.recv += n
+		c.Recv += n
 
 		buf = append(buf, b[:n]...)
 
@@ -89,7 +73,7 @@ func (c *Client) Start() error {
 			Header:  rtp.Header{Timestamp: core.Now90000()},
 			Payload: annexb.EncodeToAVCC(buf[:i], true),
 		}
-		c.receiver.WriteRTP(pkt)
+		c.Receivers[0].WriteRTP(pkt)
 
 		//log.Printf("[AVC] %v, len: %d", h264.Types(pkt.Payload), len(pkt.Payload))
 
@@ -97,22 +81,7 @@ func (c *Client) Start() error {
 	}
 }
 
-func (c *Client) Stop() error {
-	if c.receiver != nil {
-		c.receiver.Close()
-	}
-	if closer, ok := c.rd.Reader.(io.Closer); ok {
-		return closer.Close()
-	}
-	return nil
-}
-
-func (c *Client) MarshalJSON() ([]byte, error) {
-	info := &core.Info{
-		Type:      "Bitstream active producer",
-		Medias:    []*core.Media{c.media},
-		Receivers: []*core.Receiver{c.receiver},
-		Recv:      c.recv,
-	}
-	return json.Marshal(info)
+func (c *Producer) Stop() error {
+	_ = c.SuperProducer.Close()
+	return c.rd.Close()
 }
diff --git a/pkg/magic/keyframe.go b/pkg/magic/keyframe.go
index fb7e25aa..220f3a3d 100644
--- a/pkg/magic/keyframe.go
+++ b/pkg/magic/keyframe.go
@@ -43,7 +43,7 @@ func (k *Keyframe) AddTrack(media *core.Media, _ *core.Codec, track *core.Receiv
 			if !h264.IsKeyframe(packet.Payload) {
 				return
 			}
-			b := annexb.DecodeAVCC(packet.Payload)
+			b := annexb.DecodeAVCC(packet.Payload, true)
 			k.Fire(b)
 		}
 
diff --git a/pkg/magic/mjpeg/client.go b/pkg/magic/mjpeg/producer.go
similarity index 50%
rename from pkg/magic/mjpeg/client.go
rename to pkg/magic/mjpeg/producer.go
index 4a5732a3..e5627fd7 100644
--- a/pkg/magic/mjpeg/client.go
+++ b/pkg/magic/mjpeg/producer.go
@@ -2,26 +2,22 @@ package mjpeg
 
 import (
 	"bytes"
-	"encoding/json"
 	"io"
 
 	"github.com/AlexxIT/go2rtc/pkg/core"
 	"github.com/pion/rtp"
 )
 
-type Client struct {
-	rd *core.ReadSeeker
-
-	media    *core.Media
-	receiver *core.Receiver
-
-	recv int
+type Producer struct {
+	core.SuperProducer
+	rd *core.ReadBuffer
 }
 
-func NewClient(rd io.Reader) *Client {
-	return &Client{
-		rd: core.NewReadSeeker(rd),
-		media: &core.Media{
+func Open(rd io.Reader) (*Producer, error) {
+	prod := &Producer{rd: core.NewReadBuffer(rd)}
+	prod.Type = "MJPEG producer"
+	prod.Medias = []*core.Media{
+		{
 			Kind:      core.KindVideo,
 			Direction: core.DirectionRecvonly,
 			Codecs: []*core.Codec{
@@ -33,20 +29,10 @@ func NewClient(rd io.Reader) *Client {
 			},
 		},
 	}
+	return prod, nil
 }
 
-func (c *Client) GetMedias() []*core.Media {
-	return []*core.Media{c.media}
-}
-
-func (c *Client) GetTrack(media *core.Media, codec *core.Codec) (*core.Receiver, error) {
-	if c.receiver == nil {
-		c.receiver = core.NewReceiver(media, codec)
-	}
-	return c.receiver, nil
-}
-
-func (c *Client) Start() error {
+func (c *Producer) Start() error {
 	var buf []byte                     // total bufer
 	b := make([]byte, core.BufferSize) // reading buffer
 
@@ -59,7 +45,7 @@ func (c *Client) Start() error {
 				return err
 			}
 
-			c.recv += n
+			c.Recv += n
 
 			buf = append(buf, b[:n]...)
 
@@ -77,7 +63,7 @@ func (c *Client) Start() error {
 			Header:  rtp.Header{Timestamp: core.Now90000()},
 			Payload: buf[:i],
 		}
-		c.receiver.WriteRTP(pkt)
+		c.Receivers[0].WriteRTP(pkt)
 
 		//log.Printf("[mjpeg] ts=%d size=%d", pkt.Header.Timestamp, len(pkt.Payload))
 
@@ -85,22 +71,7 @@ func (c *Client) Start() error {
 	}
 }
 
-func (c *Client) Stop() error {
-	if c.receiver != nil {
-		c.receiver.Close()
-	}
-	if closer, ok := c.rd.Reader.(io.Closer); ok {
-		return closer.Close()
-	}
-	return nil
-}
-
-func (c *Client) MarshalJSON() ([]byte, error) {
-	info := &core.Info{
-		Type:      "MJPEG active producer",
-		Medias:    []*core.Media{c.media},
-		Receivers: []*core.Receiver{c.receiver},
-		Recv:      c.recv,
-	}
-	return json.Marshal(info)
+func (c *Producer) Stop() error {
+	_ = c.SuperProducer.Close()
+	return c.rd.Close()
 }
diff --git a/pkg/magic/magic.go b/pkg/magic/producer.go
similarity index 92%
rename from pkg/magic/magic.go
rename to pkg/magic/producer.go
index 4224171d..90a4b2a0 100644
--- a/pkg/magic/magic.go
+++ b/pkg/magic/producer.go
@@ -15,7 +15,7 @@ import (
 )
 
 func Open(r io.Reader) (core.Producer, error) {
-	rd := core.NewReadSeeker(r)
+	rd := core.NewReadBuffer(r)
 
 	b, err := rd.Peek(4)
 	if err != nil {
@@ -27,7 +27,7 @@ func Open(r io.Reader) (core.Producer, error) {
 		return bitstream.Open(rd)
 
 	case bytes.HasPrefix(b, []byte{0xFF, 0xD8}):
-		return mjpeg.NewClient(rd), nil
+		return mjpeg.Open(rd)
 
 	case bytes.HasPrefix(b, []byte(flv.Signature)):
 		return flv.Open(rd)
diff --git a/pkg/mpegts/client.go b/pkg/mpegts/client.go
index 520c69ca..6d925276 100644
--- a/pkg/mpegts/client.go
+++ b/pkg/mpegts/client.go
@@ -14,7 +14,7 @@ import (
 type Client struct {
 	URL string
 
-	rd *core.ReadSeeker
+	rd *core.ReadBuffer
 
 	medias    []*core.Media
 	receivers []*core.Receiver
@@ -23,7 +23,7 @@ type Client struct {
 }
 
 func Open(rd io.Reader) (*Client, error) {
-	client := &Client{rd: core.NewReadSeeker(rd)}
+	client := &Client{rd: core.NewReadBuffer(rd)}
 	if err := client.describe(); err != nil {
 		return nil, err
 	}
@@ -32,7 +32,7 @@ func Open(rd io.Reader) (*Client, error) {
 
 func (c *Client) describe() error {
 	c.rd.BufferSize = core.ProbeSize
-	defer c.rd.Rewind()
+	defer c.rd.Reset()
 
 	rd := NewReader()