abstract base class add, code refactored and imports modified

src/BaseVideoClip.py

+from moviepy.editor import VideoFileClip
+import abc
+import os
+
+
+class BaseVideoClip(VideoFileClip, abc.ABC):
+    def __init__(self, video_name, video_path, gt_base_dir):
+        self.video_clip = VideoFileClip(video_path)
+        self.fps = int(self.video_clip.fps)
+        self.duration = int(self.video_clip.duration)
+        self.gt_path = os.path.join(gt_base_dir, video_name)
+        self.video_name = video_name
+        self.n_frames = self.video_clip.reader.infos['video_nframes']
+
+    @abc.abstractmethod
+    def get_gt(self):
+        pass
+
+    def get_frames(self):
+        return list(self.video_clip.iter_frames(with_times=False))