diff --git a/codec/av1parser/parser.go b/codec/av1parser/parser.go
new file mode 100644
index 0000000..7ee0d2c
--- /dev/null
+++ b/codec/av1parser/parser.go
@@ -0,0 +1,31 @@
+package av1parser
+
+import (
+	"github.com/datarhei/joy4/av"
+)
+
+type CodecData struct {
+	Record []byte
+}
+
+func (codec CodecData) Type() av.CodecType {
+	return av.AV1
+}
+
+func (codec CodecData) AV1DecoderConfRecordBytes() []byte {
+	return codec.Record
+}
+
+func (codec CodecData) Width() int {
+	return 0
+}
+
+func (codec CodecData) Height() int {
+	return 0
+}
+
+func NewCodecDataFromAV1DecoderConfRecord(record []byte) (self CodecData, err error) {
+	self.Record = record
+
+	return
+}
diff --git a/codec/vp9parser/parser.go b/codec/vp9parser/parser.go
new file mode 100644
index 0000000..d5bbaa6
--- /dev/null
+++ b/codec/vp9parser/parser.go
@@ -0,0 +1,31 @@
+package vp9parser
+
+import (
+	"github.com/datarhei/joy4/av"
+)
+
+type CodecData struct {
+	Record []byte
+}
+
+func (codec CodecData) Type() av.CodecType {
+	return av.VP9
+}
+
+func (codec CodecData) VPDecoderConfRecordBytes() []byte {
+	return codec.Record
+}
+
+func (codec CodecData) Width() int {
+	return 0
+}
+
+func (codec CodecData) Height() int {
+	return 0
+}
+
+func NewCodecDataFromVPDecoderConfRecord(record []byte) (self CodecData, err error) {
+	self.Record = record
+
+	return
+}
diff --git a/format/flv/flv.go b/format/flv/flv.go
index 5bac86d..26fc3ab 100644
--- a/format/flv/flv.go
+++ b/format/flv/flv.go
@@ -2,7 +2,6 @@ package flv
 
 import (
 	"bufio"
-	"encoding/hex"
 	"fmt"
 	"io"
 
@@ -10,9 +9,11 @@ import (
 	"github.com/datarhei/joy4/av/avutil"
 	"github.com/datarhei/joy4/codec"
 	"github.com/datarhei/joy4/codec/aacparser"
+	"github.com/datarhei/joy4/codec/av1parser"
 	"github.com/datarhei/joy4/codec/fake"
 	"github.com/datarhei/joy4/codec/h264parser"
 	"github.com/datarhei/joy4/codec/hevcparser"
+	"github.com/datarhei/joy4/codec/vp9parser"
 	"github.com/datarhei/joy4/format/flv/flvio"
 	"github.com/datarhei/joy4/utils/bits/pio"
 )
@@ -32,16 +33,27 @@ func NewMetadataByStreams(streams []av.CodecData) (metadata flvio.AMFMap, err er
 				metadata["videocodecid"] = flvio.VIDEO_H264
 			case av.HEVC:
 				metadata["videocodecid"] = flvio.FourCCToFloat(flvio.FOURCC_HEVC)
+			case av.VP9:
+				metadata["videocodecid"] = flvio.FourCCToFloat(flvio.FOURCC_VP9)
+			case av.AV1:
+				metadata["videocodecid"] = flvio.FourCCToFloat(flvio.FOURCC_AV1)
 
 			default:
 				err = fmt.Errorf("flv: metadata: unsupported video codecType=%v", stream.Type())
 				return
 			}
 
-			metadata["width"] = stream.Width()
-			metadata["height"] = stream.Height()
-			metadata["displayWidth"] = stream.Width()
-			metadata["displayHeight"] = stream.Height()
+			width, height := stream.Width(), stream.Height()
+
+			if width != 0 {
+				metadata["width"] = width
+				metadata["displayWidth"] = width
+			}
+
+			if height != 0 {
+				metadata["height"] = height
+				metadata["displayHeight"] = height
+			}
 
 		case typ.IsAudio():
 			stream := _stream.(av.AudioCodecData)
@@ -73,15 +85,15 @@ type Prober struct {
 	CachedPkts                     []av.Packet
 }
 
-func (self *Prober) CacheTag(_tag flvio.Tag, timestamp int32) {
-	pkt, _ := self.TagToPacket(_tag, timestamp)
-	self.CachedPkts = append(self.CachedPkts, pkt)
+func (prober *Prober) CacheTag(_tag flvio.Tag, timestamp int32) {
+	pkt, _ := prober.TagToPacket(_tag, timestamp)
+	prober.CachedPkts = append(prober.CachedPkts, pkt)
 }
 
-func (self *Prober) PushTag(tag flvio.Tag, timestamp int32) (err error) {
-	self.PushedCount++
+func (prober *Prober) PushTag(tag flvio.Tag, timestamp int32) (err error) {
+	prober.PushedCount++
 
-	if self.PushedCount > MaxProbePacketCount {
+	if prober.PushedCount > MaxProbePacketCount {
 		err = fmt.Errorf("flv: max probe packet count reached")
 		return
 	}
@@ -91,38 +103,70 @@ func (self *Prober) PushTag(tag flvio.Tag, timestamp int32) (err error) {
 		if tag.IsExHeader {
 			if tag.FourCC == flvio.FOURCC_HEVC {
 				if tag.PacketType == flvio.PKTTYPE_SEQUENCE_START {
-					if !self.GotVideo {
+					if !prober.GotVideo {
 						var stream hevcparser.CodecData
-						fmt.Printf("got HEVC sequence start:\n%s\n", hex.Dump(tag.Data))
+						//fmt.Printf("got HEVC sequence start:\n%s\n", hex.Dump(tag.Data))
 						if stream, err = hevcparser.NewCodecDataFromHEVCDecoderConfRecord(tag.Data); err != nil {
 							err = fmt.Errorf("flv: hevc seqhdr invalid: %s", err.Error())
 							return
 						}
-						self.VideoStreamIdx = len(self.Streams)
-						self.Streams = append(self.Streams, stream)
-						self.GotVideo = true
+						prober.VideoStreamIdx = len(prober.Streams)
+						prober.Streams = append(prober.Streams, stream)
+						prober.GotVideo = true
 					}
 				} else if tag.PacketType == flvio.PKTTYPE_CODED_FRAMES || tag.PacketType == flvio.PKTTYPE_CODED_FRAMESX {
-					self.CacheTag(tag, timestamp)
+					prober.CacheTag(tag, timestamp)
+				}
+			} else if tag.FourCC == flvio.FOURCC_VP9 {
+				if tag.PacketType == flvio.PKTTYPE_SEQUENCE_START {
+					if !prober.GotVideo {
+						var stream vp9parser.CodecData
+						//fmt.Printf("got VP9 sequence start:\n%s\n", hex.Dump(tag.Data))
+						if stream, err = vp9parser.NewCodecDataFromVPDecoderConfRecord(tag.Data); err != nil {
+							err = fmt.Errorf("flv: vp9 seqhdr invalid: %s", err.Error())
+							return
+						}
+						prober.VideoStreamIdx = len(prober.Streams)
+						prober.Streams = append(prober.Streams, stream)
+						prober.GotVideo = true
+					}
+				} else if tag.PacketType == flvio.PKTTYPE_CODED_FRAMES || tag.PacketType == flvio.PKTTYPE_CODED_FRAMESX {
+					prober.CacheTag(tag, timestamp)
+				}
+			} else if tag.FourCC == flvio.FOURCC_AV1 {
+				if tag.PacketType == flvio.PKTTYPE_SEQUENCE_START {
+					if !prober.GotVideo {
+						var stream av1parser.CodecData
+						//fmt.Printf("got AV1 sequence start:\n%s\n", hex.Dump(tag.Data))
+						if stream, err = av1parser.NewCodecDataFromAV1DecoderConfRecord(tag.Data); err != nil {
+							err = fmt.Errorf("flv: av1 seqhdr invalid: %s", err.Error())
+							return
+						}
+						prober.VideoStreamIdx = len(prober.Streams)
+						prober.Streams = append(prober.Streams, stream)
+						prober.GotVideo = true
+					}
+				} else if tag.PacketType == flvio.PKTTYPE_CODED_FRAMES || tag.PacketType == flvio.PKTTYPE_CODED_FRAMESX || tag.PacketType == flvio.PKTTYPE_MPEG2TS_SEQUENCE_START {
+					prober.CacheTag(tag, timestamp)
 				}
 			}
 		} else {
 			switch tag.AVCPacketType {
 			case flvio.AVC_SEQHDR:
-				if !self.GotVideo {
+				if !prober.GotVideo {
 					var stream h264parser.CodecData
-					fmt.Printf("got H264 sequence start:\n%s\n", hex.Dump(tag.Data))
+					//fmt.Printf("got H264 sequence start:\n%s\n", hex.Dump(tag.Data))
 					if stream, err = h264parser.NewCodecDataFromAVCDecoderConfRecord(tag.Data); err != nil {
 						err = fmt.Errorf("flv: h264 seqhdr invalid: %s", err.Error())
 						return
 					}
-					self.VideoStreamIdx = len(self.Streams)
-					self.Streams = append(self.Streams, stream)
-					self.GotVideo = true
+					prober.VideoStreamIdx = len(prober.Streams)
+					prober.Streams = append(prober.Streams, stream)
+					prober.GotVideo = true
 				}
 
 			case flvio.AVC_NALU:
-				self.CacheTag(tag, timestamp)
+				prober.CacheTag(tag, timestamp)
 			}
 		}
 
@@ -131,42 +175,42 @@ func (self *Prober) PushTag(tag flvio.Tag, timestamp int32) (err error) {
 		case flvio.SOUND_AAC:
 			switch tag.AACPacketType {
 			case flvio.AAC_SEQHDR:
-				if !self.GotAudio {
+				if !prober.GotAudio {
 					var stream aacparser.CodecData
 					if stream, err = aacparser.NewCodecDataFromMPEG4AudioConfigBytes(tag.Data); err != nil {
 						err = fmt.Errorf("flv: aac seqhdr invalid")
 						return
 					}
-					self.AudioStreamIdx = len(self.Streams)
-					self.Streams = append(self.Streams, stream)
-					self.GotAudio = true
+					prober.AudioStreamIdx = len(prober.Streams)
+					prober.Streams = append(prober.Streams, stream)
+					prober.GotAudio = true
 				}
 
 			case flvio.AAC_RAW:
-				self.CacheTag(tag, timestamp)
+				prober.CacheTag(tag, timestamp)
 			}
 
 		case flvio.SOUND_SPEEX:
-			if !self.GotAudio {
+			if !prober.GotAudio {
 				stream := codec.NewSpeexCodecData(16000, tag.ChannelLayout())
-				self.AudioStreamIdx = len(self.Streams)
-				self.Streams = append(self.Streams, stream)
-				self.GotAudio = true
-				self.CacheTag(tag, timestamp)
+				prober.AudioStreamIdx = len(prober.Streams)
+				prober.Streams = append(prober.Streams, stream)
+				prober.GotAudio = true
+				prober.CacheTag(tag, timestamp)
 			}
 
 		case flvio.SOUND_NELLYMOSER:
-			if !self.GotAudio {
+			if !prober.GotAudio {
 				stream := fake.CodecData{
 					CodecType_:     av.NELLYMOSER,
 					SampleRate_:    16000,
 					SampleFormat_:  av.S16,
 					ChannelLayout_: tag.ChannelLayout(),
 				}
-				self.AudioStreamIdx = len(self.Streams)
-				self.Streams = append(self.Streams, stream)
-				self.GotAudio = true
-				self.CacheTag(tag, timestamp)
+				prober.AudioStreamIdx = len(prober.Streams)
+				prober.Streams = append(prober.Streams, stream)
+				prober.GotAudio = true
+				prober.CacheTag(tag, timestamp)
 			}
 
 		}
@@ -175,23 +219,23 @@ func (self *Prober) PushTag(tag flvio.Tag, timestamp int32) (err error) {
 	return
 }
 
-func (self *Prober) Probed() (ok bool) {
-	if self.HasAudio || self.HasVideo {
-		if self.HasAudio == self.GotAudio && self.HasVideo == self.GotVideo {
+func (prober *Prober) Probed() (ok bool) {
+	if prober.HasAudio || prober.HasVideo {
+		if prober.HasAudio == prober.GotAudio && prober.HasVideo == prober.GotVideo {
 			return true
 		}
 	} else {
-		if self.PushedCount == MaxProbePacketCount {
+		if prober.PushedCount == MaxProbePacketCount {
 			return true
 		}
 	}
 	return
 }
 
-func (self *Prober) TagToPacket(tag flvio.Tag, timestamp int32) (pkt av.Packet, ok bool) {
+func (prober *Prober) TagToPacket(tag flvio.Tag, timestamp int32) (pkt av.Packet, ok bool) {
 	switch tag.Type {
 	case flvio.TAG_VIDEO:
-		pkt.Idx = int8(self.VideoStreamIdx)
+		pkt.Idx = int8(prober.VideoStreamIdx)
 		switch tag.PacketType {
 		case flvio.PKTTYPE_CODED_FRAMES, flvio.PKTTYPE_CODED_FRAMESX:
 			ok = true
@@ -201,7 +245,7 @@ func (self *Prober) TagToPacket(tag flvio.Tag, timestamp int32) (pkt av.Packet,
 		}
 
 	case flvio.TAG_AUDIO:
-		pkt.Idx = int8(self.AudioStreamIdx)
+		pkt.Idx = int8(prober.AudioStreamIdx)
 		switch tag.SoundFormat {
 		case flvio.SOUND_AAC:
 			switch tag.AACPacketType {
@@ -224,13 +268,13 @@ func (self *Prober) TagToPacket(tag flvio.Tag, timestamp int32) (pkt av.Packet,
 	return
 }
 
-func (self *Prober) Empty() bool {
-	return len(self.CachedPkts) == 0
+func (prober *Prober) Empty() bool {
+	return len(prober.CachedPkts) == 0
 }
 
-func (self *Prober) PopPacket() av.Packet {
-	pkt := self.CachedPkts[0]
-	self.CachedPkts = self.CachedPkts[1:]
+func (prober *Prober) PopPacket() av.Packet {
+	pkt := prober.CachedPkts[0]
+	prober.CachedPkts = prober.CachedPkts[1:]
 	return pkt
 }
 
@@ -245,12 +289,11 @@ func CodecDataToTag(stream av.CodecData) (_tag flvio.Tag, ok bool, err error) {
 			Data:          h264.AVCDecoderConfRecordBytes(),
 			FrameType:     flvio.FRAME_KEY,
 		}
-		fmt.Printf("set H264 sequence start:\n%v\n", hex.Dump(h264.AVCDecoderConfRecordBytes()))
+		//fmt.Printf("set H264 sequence start:\n%v\n", hex.Dump(h264.AVCDecoderConfRecordBytes()))
 		ok = true
 		_tag = tag
 
 	case av.HEVC:
-		fmt.Printf("CodecDataToTag for HEVC\n")
 		hevc := stream.(hevcparser.CodecData)
 		tag := flvio.Tag{
 			Type:       flvio.TAG_VIDEO,
@@ -260,7 +303,35 @@ func CodecDataToTag(stream av.CodecData) (_tag flvio.Tag, ok bool, err error) {
 			Data:       hevc.HEVCDecoderConfRecordBytes(),
 			FrameType:  flvio.FRAME_KEY,
 		}
-		fmt.Printf("set HEVC sequence start:\n%v\n", hex.Dump(hevc.HEVCDecoderConfRecordBytes()))
+		//fmt.Printf("set HEVC sequence start:\n%v\n", hex.Dump(hevc.HEVCDecoderConfRecordBytes()))
+		ok = true
+		_tag = tag
+
+	case av.VP9:
+		vp9 := stream.(vp9parser.CodecData)
+		tag := flvio.Tag{
+			Type:       flvio.TAG_VIDEO,
+			IsExHeader: true,
+			PacketType: flvio.PKTTYPE_SEQUENCE_START,
+			FourCC:     flvio.FOURCC_VP9,
+			Data:       vp9.VPDecoderConfRecordBytes(),
+			FrameType:  flvio.FRAME_KEY,
+		}
+		//fmt.Printf("set VP9 sequence start:\n%v\n", hex.Dump(vp9.VPDecoderConfRecordBytes()))
+		ok = true
+		_tag = tag
+
+	case av.AV1:
+		av1 := stream.(av1parser.CodecData)
+		tag := flvio.Tag{
+			Type:       flvio.TAG_VIDEO,
+			IsExHeader: true,
+			PacketType: flvio.PKTTYPE_SEQUENCE_START,
+			FourCC:     flvio.FOURCC_AV1,
+			Data:       av1.AV1DecoderConfRecordBytes(),
+			FrameType:  flvio.FRAME_KEY,
+		}
+		//fmt.Printf("set AV1 sequence start:\n%v\n", hex.Dump(av1.AV1DecoderConfRecordBytes()))
 		ok = true
 		_tag = tag
 
@@ -315,7 +386,6 @@ func PacketToTag(pkt av.Packet, stream av.CodecData) (tag flvio.Tag, timestamp i
 		}
 
 	case av.HEVC:
-		//fmt.Printf("PacketToTag for HEVC\n")
 		tag = flvio.Tag{
 			Type:            flvio.TAG_VIDEO,
 			IsExHeader:      true,
@@ -335,6 +405,38 @@ func PacketToTag(pkt av.Packet, stream av.CodecData) (tag flvio.Tag, timestamp i
 			tag.FrameType = flvio.FRAME_INTER
 		}
 
+	case av.VP9:
+		tag = flvio.Tag{
+			Type:            flvio.TAG_VIDEO,
+			IsExHeader:      true,
+			PacketType:      flvio.PKTTYPE_CODED_FRAMES,
+			CompositionTime: flvio.TimeToTs(pkt.CompositionTime),
+			FourCC:          flvio.FOURCC_VP9,
+			Data:            pkt.Data,
+		}
+
+		if pkt.IsKeyFrame {
+			tag.FrameType = flvio.FRAME_KEY
+		} else {
+			tag.FrameType = flvio.FRAME_INTER
+		}
+
+	case av.AV1:
+		tag = flvio.Tag{
+			Type:            flvio.TAG_VIDEO,
+			IsExHeader:      true,
+			PacketType:      flvio.PKTTYPE_CODED_FRAMES,
+			CompositionTime: flvio.TimeToTs(pkt.CompositionTime),
+			FourCC:          flvio.FOURCC_AV1,
+			Data:            pkt.Data,
+		}
+
+		if pkt.IsKeyFrame {
+			tag.FrameType = flvio.FRAME_KEY
+		} else {
+			tag.FrameType = flvio.FRAME_INTER
+		}
+
 	case av.AAC:
 		tag = flvio.Tag{
 			Type:          flvio.TAG_AUDIO,
@@ -398,9 +500,9 @@ func NewMuxer(w io.Writer) *Muxer {
 	return NewMuxerWriteFlusher(bufio.NewWriterSize(w, pio.RecommendBufioSize))
 }
 
-var CodecTypes = []av.CodecType{av.H264, av.AAC, av.SPEEX}
+var CodecTypes = []av.CodecType{av.H264, av.HEVC, av.VP9, av.AV1, av.AAC, av.SPEEX}
 
-func (self *Muxer) WriteHeader(streams []av.CodecData) (err error) {
+func (muxer *Muxer) WriteHeader(streams []av.CodecData) (err error) {
 	var flags uint8
 	for _, stream := range streams {
 		if stream.Type().IsVideo() {
@@ -410,8 +512,8 @@ func (self *Muxer) WriteHeader(streams []av.CodecData) (err error) {
 		}
 	}
 
-	n := flvio.FillFileHeader(self.b, flags)
-	if _, err = self.bufw.Write(self.b[:n]); err != nil {
+	n := flvio.FillFileHeader(muxer.b, flags)
+	if _, err = muxer.bufw.Write(muxer.b[:n]); err != nil {
 		return
 	}
 
@@ -422,28 +524,28 @@ func (self *Muxer) WriteHeader(streams []av.CodecData) (err error) {
 			return
 		}
 		if ok {
-			if err = flvio.WriteTag(self.bufw, tag, 0, self.b); err != nil {
+			if err = flvio.WriteTag(muxer.bufw, tag, 0, muxer.b); err != nil {
 				return
 			}
 		}
 	}
 
-	self.streams = streams
+	muxer.streams = streams
 	return
 }
 
-func (self *Muxer) WritePacket(pkt av.Packet) (err error) {
-	stream := self.streams[pkt.Idx]
+func (muxer *Muxer) WritePacket(pkt av.Packet) (err error) {
+	stream := muxer.streams[pkt.Idx]
 	tag, timestamp := PacketToTag(pkt, stream)
 
-	if err = flvio.WriteTag(self.bufw, tag, timestamp, self.b); err != nil {
+	if err = flvio.WriteTag(muxer.bufw, tag, timestamp, muxer.b); err != nil {
 		return
 	}
 	return
 }
 
-func (self *Muxer) WriteTrailer() (err error) {
-	if err = self.bufw.Flush(); err != nil {
+func (muxer *Muxer) WriteTrailer() (err error) {
+	if err = muxer.bufw.Flush(); err != nil {
 		return
 	}
 	return
@@ -464,78 +566,76 @@ func NewDemuxer(r io.Reader) *Demuxer {
 	}
 }
 
-func (self *Demuxer) prepare() (err error) {
-	for self.stage < 2 {
-		switch self.stage {
+func (demuxer *Demuxer) prepare() (err error) {
+	for demuxer.stage < 2 {
+		switch demuxer.stage {
 		case 0:
-			if _, err = io.ReadFull(self.bufr, self.b[:flvio.FileHeaderLength]); err != nil {
+			if _, err = io.ReadFull(demuxer.bufr, demuxer.b[:flvio.FileHeaderLength]); err != nil {
 				return
 			}
 			var flags uint8
 			var skip int
-			if flags, skip, err = flvio.ParseFileHeader(self.b); err != nil {
+			if flags, skip, err = flvio.ParseFileHeader(demuxer.b); err != nil {
 				return
 			}
-			if _, err = self.bufr.Discard(skip); err != nil {
+			if _, err = demuxer.bufr.Discard(skip); err != nil {
 				return
 			}
 			if flags&flvio.FILE_HAS_AUDIO != 0 {
-				self.prober.HasAudio = true
+				demuxer.prober.HasAudio = true
 			}
 			if flags&flvio.FILE_HAS_VIDEO != 0 {
-				self.prober.HasVideo = true
+				demuxer.prober.HasVideo = true
 			}
-			self.stage++
+			demuxer.stage++
 
 		case 1:
-			for !self.prober.Probed() {
+			for !demuxer.prober.Probed() {
 				var tag flvio.Tag
 				var timestamp int32
-				if tag, timestamp, err = flvio.ReadTag(self.bufr, self.b); err != nil {
+				if tag, timestamp, err = flvio.ReadTag(demuxer.bufr, demuxer.b); err != nil {
 					return
 				}
-				if err = self.prober.PushTag(tag, timestamp); err != nil {
+				if err = demuxer.prober.PushTag(tag, timestamp); err != nil {
 					return
 				}
 			}
-			self.stage++
+			demuxer.stage++
 		}
 	}
 	return
 }
 
-func (self *Demuxer) Streams() (streams []av.CodecData, err error) {
-	if err = self.prepare(); err != nil {
+func (demuxer *Demuxer) Streams() (streams []av.CodecData, err error) {
+	if err = demuxer.prepare(); err != nil {
 		return
 	}
-	streams = self.prober.Streams
+	streams = demuxer.prober.Streams
 	return
 }
 
-func (self *Demuxer) ReadPacket() (pkt av.Packet, err error) {
-	if err = self.prepare(); err != nil {
+func (demuxer *Demuxer) ReadPacket() (pkt av.Packet, err error) {
+	if err = demuxer.prepare(); err != nil {
 		return
 	}
 
-	if !self.prober.Empty() {
-		pkt = self.prober.PopPacket()
+	if !demuxer.prober.Empty() {
+		pkt = demuxer.prober.PopPacket()
 		return
 	}
 
 	for {
 		var tag flvio.Tag
 		var timestamp int32
-		if tag, timestamp, err = flvio.ReadTag(self.bufr, self.b); err != nil {
+		if tag, timestamp, err = flvio.ReadTag(demuxer.bufr, demuxer.b); err != nil {
 			return
 		}
 
 		var ok bool
-		if pkt, ok = self.prober.TagToPacket(tag, timestamp); ok {
+		if pkt, ok = demuxer.prober.TagToPacket(tag, timestamp); ok {
 			return
 		}
 	}
-
-	return
 }
 
 func Handler(h *avutil.RegisterHandler) {
diff --git a/format/flv/flvio/flvio.go b/format/flv/flvio/flvio.go
index 9b69085..8c0a57e 100644
--- a/format/flv/flvio/flvio.go
+++ b/format/flv/flvio/flvio.go
@@ -316,7 +316,7 @@ func (t *Tag) videoParseHeader(b []byte) (n int, err error) {
 		}
 	}
 
-	//fmt.Printf("parseVideoHeader: PacketType: %d\n%s\n", t.PacketType, hex.Dump(b[:n]))
+	//fmt.Printf("parseVideoHeader: PacketType: %d\n", t.PacketType)
 
 	return
 }
diff --git a/format/rtmp/rtmp.go b/format/rtmp/rtmp.go
index 9b8a93f..6a0e1f1 100644
--- a/format/rtmp/rtmp.go
+++ b/format/rtmp/rtmp.go
@@ -78,7 +78,6 @@ func (self *Server) handleConn(conn *Conn) (err error) {
 		}
 
 		if conn.playing {
-			fmt.Printf("play\n")
 			if self.HandlePlay != nil {
 				self.HandlePlay(conn)
 			}
@@ -464,7 +463,7 @@ func (self *Conn) readConnect() (err error) {
 		return
 	}
 
-	fmt.Printf("readConnect: %+v\n", self.commandobj)
+	//fmt.Printf("readConnect: %+v\n", self.commandobj)
 
 	var ok bool
 	var _app, _tcurl interface{}
@@ -992,17 +991,12 @@ func (self *Conn) WriteHeader(streams []av.CodecData) (err error) {
 
 	//metadata = self.GetMetaData()
 
-	fmt.Printf("WriteHeader\n")
-
 	if metadata == nil {
 		if metadata, err = flv.NewMetadataByStreams(streams); err != nil {
-			fmt.Printf("WriteHeader error: %s\n", err.Error())
 			return
 		}
 	}
 
-	fmt.Printf("WriteHeader: %#v\n", metadata)
-
 	// > onMetaData()
 	if err = self.writeDataMsg(5, self.avmsgsid, "onMetaData", metadata); err != nil {
 		return
@@ -1558,8 +1552,8 @@ func (self *Conn) handleMsg(timestamp uint32, msgsid uint32, msgtypeid uint8, ms
 
 		if metaindex != -1 && metaindex < len(self.datamsgvals) {
 			self.metadata = self.datamsgvals[metaindex].(flvio.AMFMap)
-			fmt.Printf("onMetadata: %+v\n", self.metadata)
-			fmt.Printf("videocodecid: %#08x (%f)\n", int64(self.metadata["videocodecid"].(float64)), self.metadata["videocodecid"].(float64))
+			//fmt.Printf("onMetadata: %+v\n", self.metadata)
+			//fmt.Printf("videocodecid: %#08x (%f)\n", int64(self.metadata["videocodecid"].(float64)), self.metadata["videocodecid"].(float64))
 		}
 
 	case msgtypeidVideoMsg: