diff --git a/video_decoder.py b/video_decoder.py
index 2ee17de..08717d1 100644
--- a/video_decoder.py
+++ b/video_decoder.py
@@ -33,17 +33,15 @@ class VideoDecoder(PyOperator):
         self._sample_type = sample_type
         self._args = args if args is not None else {}
 
-    def get_sample(self, stream):
+    def get_sample(self, stream, duration):
         if self._sample_type is None:
             return self._no_sample
         elif self._sample_type.lower() == SAMPLE_TYPE.UNIFORM_TEMPORAL_SUBSAMPLE:
-            duration = VideoDecoder.get_video_duration(stream)
             end_time = self._end_time if self._end_time is not None and self._end_time <= duration else duration
             start_time = self._start_time if self._start_time is not None else 0
             nums = int(stream.rate * (end_time - start_time))
             return partial(self._uniform_temporal_subsample, total_frames=nums)
         elif self._sample_type.lower() == SAMPLE_TYPE.TIME_STEP_SAMPLE:
-            duration = VideoDecoder.get_video_duration(stream)
             start_time = self._start_time if self._start_time is not None else 0
             end_time = self._end_time if self._end_time is not None and self._end_time <= duration else duration
             return partial(self._time_step_sample, start_time=start_time, end_time=end_time)
@@ -108,22 +106,25 @@ class VideoDecoder(PyOperator):
                 continue
             yield frame
 
-    def get_video_duration(video):
-        if video.duration is not None:
-            return float(video.duration * video.time_base)
-        elif video.metadata.get('DURATION') is not None:
-            time_str = video.metadata['DURATION']
-            return reduce(lambda x, y: float(x) * 60 + float(y), time_str.split(':'))
-        else:
-            return None
+    # @staticmethod
+    # def get_video_duration(video):
+    #     print(video)
+    #     if video.duration is not None:
+    #         return float(video.duration * video.time_base)
+    #     elif video.metadata.get('DURATION') is not None:
+    #         time_str = video.metadata['DURATION']
+    #         return reduce(lambda x, y: float(x) * 60 + float(y), time_str.split(':'))
+    #     else:
+    #         return None
 
     def __call__(self, video_path: str) -> Generator:
         with av.open(video_path) as container:
             stream = container.streams.video[0]
+            duration = float(container.duration) / 1000000
             image_format = 'RGB'
 
             frame_gen = VideoDecoder._decdoe(stream, container, self._start_time)
-            sample_function = self.get_sample(stream)
+            sample_function = self.get_sample(stream, duration)
             for frame in sample_function(frame_gen):
                 timestamp = int(frame.time * 1000)
                 ndarray = frame.to_ndarray(format='rgb24')
@@ -136,7 +137,8 @@ class VideoDecoder(PyOperator):
 #     video_path = "/home/junjie.jiangjjj/workspace/video/[The Rock] [1996] [Trailer] [#2]-16-l-rO5B64.mkv"
 #     video_path1 = "/home/junjie.jiangjjj/workspace/video/'Eagle Eye' Trailer (2008)-_wkqo_Rd3_Q.mp4"
 #     video_path2 = "/home/junjie.jiangjjj/workspace/video/2001 -  A Space Odyssey - Trailer [1968] HD-Z2UWOeBcsJI.webm"
-#     video_path3 = "/home/zhangchen/zhangchen_workspace/dataset/MSRVTT/msrvtt_data/MSRVTT_Videos/video9991.mp4"
+#     # video_path3 = "/home/zhangchen/zhangchen_workspace/dataset/MSRVTT/msrvtt_data/MSRVTT_Videos/video9991.mp4"
+#     video_path3 = "/home/junjie.jiangjjj/e2adc784b83446ae775f698b9d17c9fd392b2f75.flv"
 
 #     def d(video_path):
 #         d = VideoDecoder(10, 17, 'time_step_sample', {'time_step': 1})
@@ -144,7 +146,12 @@ class VideoDecoder(PyOperator):
 #         for f in fs:
 #             print(f.mode, f.key_frame, f.timestamp)
 
-#     d(video_path1)
-#     print('#' * 100)
-#     d(video_path2)    
+#     d(video_path)
+#     # print('#' * 100)
+
+#     # with av.open(video_path) as container:
+#     #     print(container.duration)
+#     #     stream = container.streams.video[0]
+#     #     print(stream.time_base)
+