Merge pull request #273 from gnes-ai/fix_shot_detect

fix(preprocessor): fix bug when num_frames < 4 in shotdetect

gnes/preprocessor/helper.py

@@ -357,7 +357,7 @@ def motion_algo(distances: List[float], **kwargs) -> List[int]:
 
     shots = []
     num_frames = len(distances) + 1
-    p = peakutils.indexes(np.array(distances).astype('float32'), thres=arg_dict['threshold'], min_dist=arg_dict['min_dist'])
+    p = peakutils.indexes(np.array(distances).astype('float32'), thres=arg_dict['threshold'], min_dist=arg_dict['min_dist']) if len(distances) else []
     if len(p) == 0:
         return [0, num_frames]