ADD fps caching

src/models/streams.py

@@ -2,6 +2,7 @@ from pydantic import BaseModel, Field
 from typing import Optional
 from datetime import datetime
 from pathlib import Path
+from functools import cached_property
 
 from lib.fs import sanitize_filename
 
@@ -25,7 +26,7 @@ class VideoStream(BaseModel):
     disposition: Disposition
     tags: Tags
 
-    @property
+    @cached_property
     def fps(self) -> float:
         frame_numbers = [int(x) for x in self.avg_frame_rate.split("/")]
         return frame_numbers[0] / frame_numbers[1]