diff --git a/codec/h265/lex.go b/codec/h265/lex.go
index d67cf289..f5afa5e6 100644
--- a/codec/h265/lex.go
+++ b/codec/h265/lex.go
@@ -76,6 +76,7 @@ func (l *Lexer) Lex(dst io.Writer, src io.Reader, delay time.Duration) error {
 		switch err {
 		case nil: // Do nothing.
 		case io.EOF:
+			fmt.Println("done")
 			return nil
 		default:
 			return fmt.Errorf("source read error: %v\n", err)
@@ -150,6 +151,11 @@ func (l *Lexer) handleFragmentation(d []byte) {
 	start := d[2]&0x80 != 0
 	end := d[2]&0x40 != 0
 
+	var head []byte
+	if start {
+		head = []byte{(d[0] & 0x81) | ((d[2] & 0x3f) << 1), d[1]}
+	}
+
 	d = d[3:]
 	if l.donl {
 		d = d[2:]
@@ -158,7 +164,8 @@ func (l *Lexer) handleFragmentation(d []byte) {
 	switch {
 	case start && !end:
 		l.frag = true
-		l.writeWithPrefix(d)
+		_d := append(head, d...)
+		l.writeWithPrefix(_d)
 	case !start && end:
 		l.frag = false
 		fallthrough