diff --git a/gnes/preprocessor/video/ffmpeg.py b/gnes/preprocessor/video/ffmpeg.py
index c54e13bf..66b19e59 100644
--- a/gnes/preprocessor/video/ffmpeg.py
+++ b/gnes/preprocessor/video/ffmpeg.py
@@ -112,6 +112,7 @@ def __init__(self,
         super().__init__(*args, **kwargs)
         self.segment_method = segment_method
         self.segment_interval = segment_interval
+        self.segment_num = segment_num
         self._ffmpeg_kwargs = kwargs
 
     def apply(self, doc: 'gnes_pb2.Document') -> None:
diff --git a/tests/test_video_preprocessor.py b/tests/test_video_preprocessor.py
index 9d92e986..22bf525c 100644
--- a/tests/test_video_preprocessor.py
+++ b/tests/test_video_preprocessor.py
@@ -15,6 +15,8 @@ def setUp(self):
         self.yml_path_2 = os.path.join(self.dirname, 'yaml', 'preprocessor-ffmpeg2.yml')
         self.yml_path_3 = os.path.join(self.dirname, 'yaml', 'preprocessor-ffmpeg3.yml')
         self.video_path = os.path.join(self.dirname, 'videos')
+        self.video_bytes = [open(os.path.join(self.video_path, _), 'rb').read()
+                            for _ in os.listdir(self.video_path)]
 
     def test_video_preprocessor_service_empty(self):
         args = set_preprocessor_service_parser().parse_args([
@@ -28,23 +30,13 @@ def test_video_preprocessor_service_realdata(self):
             '--yaml_path', self.yml_path
         ])
 
-        args_2 = set_preprocessor_service_parser().parse_args([
-            '--yaml_path', self.yml_path_2
-        ])
-
-        args_3 = set_preprocessor_service_parser().parse_args([
-            '--yaml_path', self.yml_path_3
-        ])
-
         c_args = _set_client_parser().parse_args([
             '--port_in', str(args.port_out),
             '--port_out', str(args.port_in)
         ])
-        video_bytes = [open(os.path.join(self.video_path, _), 'rb').read()
-                       for _ in os.listdir(self.video_path)]
 
         with PreprocessorService(args), ZmqClient(c_args) as client:
-            for req in RequestGenerator.index(video_bytes):
+            for req in RequestGenerator.index(self.video_bytes):
                 msg = gnes_pb2.Message()
                 msg.request.index.CopyFrom(req.index)
                 client.send_message(msg)
@@ -55,8 +47,17 @@ def test_video_preprocessor_service_realdata(self):
                         shape = blob2array(d.chunks[_].blob).shape
                         self.assertEqual(shape, (168, 192, 3))
 
-        with PreprocessorService(args_2), ZmqClient(c_args) as client:
-            for req in RequestGenerator.index(video_bytes):
+    def test_video_cut_by_frame(self):
+        args = set_preprocessor_service_parser().parse_args([
+            '--yaml_path', self.yml_path_2,
+        ])
+        c_args = _set_client_parser().parse_args([
+            '--port_in', str(args.port_out),
+            '--port_out', str(args.port_in)
+        ])
+
+        with PreprocessorService(args), ZmqClient(c_args) as client:
+            for req in RequestGenerator.index(self.video_bytes):
                 msg = gnes_pb2.Message()
                 msg.request.index.CopyFrom(req.index)
                 client.send_message(msg)
@@ -69,8 +70,17 @@ def test_video_preprocessor_service_realdata(self):
                     shape = blob2array(d.chunks[-1].blob).shape
                     self.assertLessEqual(shape[0], 30)
 
-        with PreprocessorService(args_2), ZmqClient(c_args) as client:
-            for req in RequestGenerator.index(video_bytes):
+    def test_video_cut_by_num(self):
+        args = set_preprocessor_service_parser().parse_args([
+            '--yaml_path', self.yml_path_3
+        ])
+        c_args = _set_client_parser().parse_args([
+            '--port_in', str(args.port_out),
+            '--port_out', str(args.port_in)
+        ])
+
+        with PreprocessorService(args), ZmqClient(c_args) as client:
+            for req in RequestGenerator.index(self.video_bytes):
                 msg = gnes_pb2.Message()
                 msg.request.index.CopyFrom(req.index)
                 client.send_message(msg)