diff --git a/hls/hls_stream.go b/hls/hls_stream.go
index 4cf1e44..3c24bff 100644
--- a/hls/hls_stream.go
+++ b/hls/hls_stream.go
@@ -13,10 +13,8 @@ type tsContext struct {
 	writeBuffer     []byte
 	writeBufferSize int
 
-	duration       int
-	playlistLength int
-	url            string
-	path           string
+	url  string
+	path string
 
 	file *os.File
 }
@@ -31,6 +29,7 @@ type Stream struct {
 	m3u8Name string
 	tsFormat string
 	dir      string
+	duration int
 	m3u8File *os.File
 }
 
@@ -58,6 +57,7 @@ func NewTransStream(url, m3u8Name, tsFormat, dir string, segmentDuration, playli
 		m3u8Name: m3u8Name,
 		tsFormat: tsFormat,
 		dir:      dir,
+		duration: segmentDuration,
 	}
 
 	muxer := libmpeg.NewTSMuxer()
@@ -68,8 +68,6 @@ func NewTransStream(url, m3u8Name, tsFormat, dir string, segmentDuration, playli
 		segmentSeq:      0,
 		writeBuffer:     make([]byte, 1024*1024),
 		writeBufferSize: 0,
-		duration:        segmentDuration,
-		playlistLength:  playlistLength,
 	}
 
 	stream_.muxer = muxer
@@ -83,7 +81,8 @@ func (t *Stream) Input(packet utils.AVPacket) error {
 		return fmt.Errorf("track not available")
 	}
 
-	if utils.AVMediaTypeVideo == packet.MediaType() && packet.KeyFrame() || t.context.file == nil {
+	//创建一下个切片
+	if (!t.ExistVideo || utils.AVMediaTypeVideo == packet.MediaType() && packet.KeyFrame()) && float32(t.muxer.Duration())/90000 >= float32(t.duration) {
 		if err := t.createSegment(); err != nil {
 			return err
 		}
@@ -116,7 +115,7 @@ func (t *Stream) AddTrack(stream utils.AVStream) error {
 }
 
 func (t *Stream) WriteHeader() error {
-	return nil
+	return t.createSegment()
 }
 
 func (t *Stream) onTSWrite(data []byte) {
diff --git a/hls/m3u8.go b/hls/m3u8.go
index b70708c..62fca69 100644
--- a/hls/m3u8.go
+++ b/hls/m3u8.go
@@ -59,18 +59,11 @@ type Segment struct {
 }
 
 type m3u8Writer struct {
-	stringBuffer   *bytes.Buffer
-	targetDuration int
-	playlist       *stream.Queue
+	stringBuffer *bytes.Buffer
+	playlist     *stream.Queue
 }
 
 func (m *m3u8Writer) AddSegment(duration float32 /*title string,*/, url string, sequence int) {
-	//影响播放器缓存.
-	round := int(math.Ceil(float64(duration)))
-	if round > m.targetDuration {
-		m.targetDuration = round
-	}
-
 	if m.playlist.IsFull() {
 		m.playlist.Pop()
 	}
@@ -78,6 +71,31 @@ func (m *m3u8Writer) AddSegment(duration float32 /*title string,*/, url string,
 	m.playlist.Push(Segment{duration: duration, url: url, sequence: sequence})
 }
 
+func (m *m3u8Writer) targetDuration() int {
+	var targetDuration int
+	head, tail := m.playlist.Data()
+
+	compute := func(playlist []interface{}) {
+		for _, segment := range playlist {
+			//影响播放器缓存.
+			round := int(math.Ceil(float64(segment.(Segment).duration)))
+			if round > targetDuration {
+				targetDuration = round
+			}
+		}
+	}
+
+	if head != nil {
+		compute(head)
+	}
+
+	if tail != nil {
+		compute(tail)
+	}
+
+	return targetDuration
+}
+
 func (m *m3u8Writer) ToString() string {
 	//暂时只实现简单的播放列表
 	head, tail := m.playlist.Data()
@@ -90,7 +108,7 @@ func (m *m3u8Writer) ToString() string {
 	//暂时只实现第三个版本
 	m.stringBuffer.WriteString("#EXT-X-VERSION:3\r\n")
 	m.stringBuffer.WriteString("#EXT-X-TARGETDURATION:")
-	m.stringBuffer.WriteString(strconv.Itoa(m.targetDuration))
+	m.stringBuffer.WriteString(strconv.Itoa(m.targetDuration()))
 	m.stringBuffer.WriteString("\r\n")
 	m.stringBuffer.WriteString("#ExtXMediaSequence:")
 	m.stringBuffer.WriteString(strconv.Itoa(head[0].(Segment).sequence))
diff --git a/main.go b/main.go
index 30f95ec..3d036a2 100644
--- a/main.go
+++ b/main.go
@@ -21,7 +21,7 @@ func CreateTransStream(source stream.ISource, protocol stream.Protocol, streams
 		m3u8Name := id + ".m3u8"
 		tsFormat := id + "_%d.ts"
 
-		transStream, err := hls.NewTransStream("/live/hls/", m3u8Name, tsFormat, "../tmp/", 2, 10)
+		transStream, err := hls.NewTransStream("", m3u8Name, tsFormat, "../tmp/", 2, 10)
 		if err != nil {
 			panic(err)
 		}
diff --git a/rtmp/rtmp_server_test.go b/rtmp/rtmp_server_test.go
index 0db7c3d..3f78449 100644
--- a/rtmp/rtmp_server_test.go
+++ b/rtmp/rtmp_server_test.go
@@ -8,7 +8,7 @@ import (
 	"testing"
 )
 
-func CreateTransStream(protocol stream.Protocol, streams []utils.AVStream) stream.ITransStream {
+func CreateTransStream(source stream.ISource, protocol stream.Protocol, streams []utils.AVStream) stream.ITransStream {
 	if stream.ProtocolRtmp == protocol {
 		return NewTransStream(librtmp.ChunkSize)
 	}
diff --git a/stream/trans_stream.go b/stream/trans_stream.go
index 930c52d..aec34ce 100644
--- a/stream/trans_stream.go
+++ b/stream/trans_stream.go
@@ -89,7 +89,7 @@ type TransStreamImpl struct {
 	Tracks      []utils.AVStream
 	transBuffer MemoryPool //每个TransStream也缓存封装后的流
 	Completed   bool
-	existVideo  bool
+	ExistVideo  bool
 }
 
 func (t *TransStreamImpl) Input(packet utils.AVPacket) error {
@@ -99,7 +99,7 @@ func (t *TransStreamImpl) Input(packet utils.AVPacket) error {
 func (t *TransStreamImpl) AddTrack(stream utils.AVStream) error {
 	t.Tracks = append(t.Tracks, stream)
 	if utils.AVMediaTypeVideo == stream.Type() {
-		t.existVideo = true
+		t.ExistVideo = true
 	}
 	return nil
 }