diff --git a/pkg/logic/gop_cache.go b/pkg/logic/gop_cache.go
index fc3bd65..353b8b5 100644
--- a/pkg/logic/gop_cache.go
+++ b/pkg/logic/gop_cache.go
@@ -106,12 +106,12 @@ func (gc *GOPCache) Feed(msg rtmp.AVMsg, lg LazyGet) {
 	}
 }
 
-func (gc *GOPCache) GetGOPLen() int {
+func (gc *GOPCache) GetGOPCount() int {
 	return (gc.gopRingLast + gc.gopSize - gc.gopRingFirst) % gc.gopSize
 }
 
 func (gc *GOPCache) GetGOPDataAt(pos int) [][]byte {
-	if pos >= gc.GetGOPLen() || pos < 0 {
+	if pos >= gc.GetGOPCount() || pos < 0 {
 		return nil
 	}
 	return gc.gopRing[(pos+gc.gopRingFirst)%gc.gopSize].data
@@ -132,12 +132,12 @@ func (gc *GOPCache) feedLastGOP(msg rtmp.AVMsg, b []byte) {
 }
 
 func (gc *GOPCache) feedNewGOP(msg rtmp.AVMsg, b []byte) {
-	gc.gopRing[gc.gopRingLast].Clear()
-	gc.gopRing[gc.gopRingLast].Feed(msg, b)
-	gc.gopRingLast = (gc.gopRingLast + 1) % gc.gopSize
 	if gc.isGOPRingFull() {
 		gc.gopRingFirst = (gc.gopRingFirst + 1) % gc.gopSize
 	}
+	gc.gopRing[gc.gopRingLast].Clear()
+	gc.gopRing[gc.gopRingLast].Feed(msg, b)
+	gc.gopRingLast = (gc.gopRingLast + 1) % gc.gopSize
 }
 
 func (gc *GOPCache) isGOPRingFull() bool {
diff --git a/pkg/logic/gop_cache_test.go b/pkg/logic/gop_cache_test.go
index 229f121..ac236ff 100644
--- a/pkg/logic/gop_cache_test.go
+++ b/pkg/logic/gop_cache_test.go
@@ -50,61 +50,61 @@ func TestGOPCache_Feed(t *testing.T) {
 	p4f := func() []byte { return []byte{0, 4} }
 
 	nc := NewGOPCache("rtmp", "test", 3)
-	assert.Equal(t, 0, nc.GetGopLen())
-	assert.Equal(t, nil, nc.GetGopDataAt(0))
-	assert.Equal(t, nil, nc.GetGopDataAt(1))
-	assert.Equal(t, nil, nc.GetGopDataAt(2))
-	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	assert.Equal(t, 0, nc.GetGOPCount())
+	assert.Equal(t, nil, nc.GetGOPDataAt(0))
+	assert.Equal(t, nil, nc.GetGOPDataAt(1))
+	assert.Equal(t, nil, nc.GetGOPDataAt(2))
+	assert.Equal(t, nil, nc.GetGOPDataAt(3))
 
 	nc.Feed(i1, i1f)
-	assert.Equal(t, 1, nc.GetGopLen())
-	assert.Equal(t, [][]byte{{1, 1}}, nc.GetGopDataAt(0))
-	assert.Equal(t, nil, nc.GetGopDataAt(1))
-	assert.Equal(t, nil, nc.GetGopDataAt(2))
-	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	assert.Equal(t, 1, nc.GetGOPCount())
+	assert.Equal(t, [][]byte{{1, 1}}, nc.GetGOPDataAt(0))
+	assert.Equal(t, nil, nc.GetGOPDataAt(1))
+	assert.Equal(t, nil, nc.GetGOPDataAt(2))
+	assert.Equal(t, nil, nc.GetGOPDataAt(3))
 	nc.Feed(p1, p1f)
-	assert.Equal(t, 1, nc.GetGopLen())
-	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGopDataAt(0))
-	assert.Equal(t, nil, nc.GetGopDataAt(1))
-	assert.Equal(t, nil, nc.GetGopDataAt(2))
-	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	assert.Equal(t, 1, nc.GetGOPCount())
+	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGOPDataAt(0))
+	assert.Equal(t, nil, nc.GetGOPDataAt(1))
+	assert.Equal(t, nil, nc.GetGOPDataAt(2))
+	assert.Equal(t, nil, nc.GetGOPDataAt(3))
 
 	nc.Feed(i2, i2f)
-	assert.Equal(t, 2, nc.GetGopLen())
-	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGopDataAt(0))
-	assert.Equal(t, [][]byte{{1, 2}}, nc.GetGopDataAt(1))
-	assert.Equal(t, nil, nc.GetGopDataAt(2))
-	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	assert.Equal(t, 2, nc.GetGOPCount())
+	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGOPDataAt(0))
+	assert.Equal(t, [][]byte{{1, 2}}, nc.GetGOPDataAt(1))
+	assert.Equal(t, nil, nc.GetGOPDataAt(2))
+	assert.Equal(t, nil, nc.GetGOPDataAt(3))
 	nc.Feed(p2, p2f)
-	assert.Equal(t, 2, nc.GetGopLen())
-	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGopDataAt(0))
-	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGopDataAt(1))
-	assert.Equal(t, nil, nc.GetGopDataAt(2))
-	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	assert.Equal(t, 2, nc.GetGOPCount())
+	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGOPDataAt(0))
+	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGOPDataAt(1))
+	assert.Equal(t, nil, nc.GetGOPDataAt(2))
+	assert.Equal(t, nil, nc.GetGOPDataAt(3))
 
 	nc.Feed(i3, i3f)
-	assert.Equal(t, 3, nc.GetGopLen())
-	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGopDataAt(0))
-	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGopDataAt(1))
-	assert.Equal(t, [][]byte{{1, 3}}, nc.GetGopDataAt(2))
-	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	assert.Equal(t, 3, nc.GetGOPCount())
+	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGOPDataAt(0))
+	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGOPDataAt(1))
+	assert.Equal(t, [][]byte{{1, 3}}, nc.GetGOPDataAt(2))
+	assert.Equal(t, nil, nc.GetGOPDataAt(3))
 	nc.Feed(p3, p3f)
-	assert.Equal(t, 3, nc.GetGopLen())
-	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGopDataAt(0))
-	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGopDataAt(1))
-	assert.Equal(t, [][]byte{{1, 3}, {0, 3}}, nc.GetGopDataAt(2))
-	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	assert.Equal(t, 3, nc.GetGOPCount())
+	assert.Equal(t, [][]byte{{1, 1}, {0, 1}}, nc.GetGOPDataAt(0))
+	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGOPDataAt(1))
+	assert.Equal(t, [][]byte{{1, 3}, {0, 3}}, nc.GetGOPDataAt(2))
+	assert.Equal(t, nil, nc.GetGOPDataAt(3))
 
 	nc.Feed(i4, i4f)
-	assert.Equal(t, 3, nc.GetGopLen())
-	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGopDataAt(0))
-	assert.Equal(t, [][]byte{{1, 3}, {0, 3}}, nc.GetGopDataAt(1))
-	assert.Equal(t, [][]byte{{1, 4}}, nc.GetGopDataAt(2))
-	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	assert.Equal(t, 3, nc.GetGOPCount())
+	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGOPDataAt(0))
+	assert.Equal(t, [][]byte{{1, 3}, {0, 3}}, nc.GetGOPDataAt(1))
+	assert.Equal(t, [][]byte{{1, 4}}, nc.GetGOPDataAt(2))
+	assert.Equal(t, nil, nc.GetGOPDataAt(3))
 	nc.Feed(p4, p4f)
-	assert.Equal(t, 3, nc.GetGopLen())
-	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGopDataAt(0))
-	assert.Equal(t, [][]byte{{1, 3}, {0, 3}}, nc.GetGopDataAt(1))
-	assert.Equal(t, [][]byte{{1, 4}, {0, 4}}, nc.GetGopDataAt(2))
-	assert.Equal(t, nil, nc.GetGopDataAt(3))
+	assert.Equal(t, 3, nc.GetGOPCount())
+	assert.Equal(t, [][]byte{{1, 2}, {0, 2}}, nc.GetGOPDataAt(0))
+	assert.Equal(t, [][]byte{{1, 3}, {0, 3}}, nc.GetGOPDataAt(1))
+	assert.Equal(t, [][]byte{{1, 4}, {0, 4}}, nc.GetGOPDataAt(2))
+	assert.Equal(t, nil, nc.GetGOPDataAt(3))
 }
diff --git a/pkg/logic/group.go b/pkg/logic/group.go
index 154175c..c94de41 100644
--- a/pkg/logic/group.go
+++ b/pkg/logic/group.go
@@ -193,8 +193,8 @@ func (group *Group) broadcastRTMP(msg rtmp.AVMsg) {
 			if group.gopCache.AACSeqHeader != nil {
 				_ = session.AsyncWrite(group.gopCache.AACSeqHeader)
 			}
-			for i := 0; i < group.gopCache.GetGopLen(); i++ {
-				for _, item := range group.gopCache.GetGopDataAt(i) {
+			for i := 0; i < group.gopCache.GetGOPCount(); i++ {
+				for _, item := range group.gopCache.GetGOPDataAt(i) {
 					_ = session.AsyncWrite(item)
 				}
 			}
@@ -218,8 +218,8 @@ func (group *Group) broadcastRTMP(msg rtmp.AVMsg) {
 			if group.httpflvGopCache.AACSeqHeader != nil {
 				session.WriteRawPacket(group.httpflvGopCache.AACSeqHeader)
 			}
-			for i := 0; i < group.httpflvGopCache.GetGopLen(); i++ {
-				for _, item := range group.httpflvGopCache.GetGopDataAt(i) {
+			for i := 0; i < group.httpflvGopCache.GetGOPCount(); i++ {
+				for _, item := range group.httpflvGopCache.GetGOPDataAt(i) {
 					session.WriteRawPacket(item)
 				}
 			}