Change clean snapshots from png to webp format (#20484)

* save clean webp instead of png

* send clean webp to plus with fallback for old events

* manual event webp

* event cleanup

* api def

* convert png to webp if exists

* update reference config

* change quality

frigate/camera/state.py

@@ -530,17 +530,19 @@ class CameraState:
 
         # write clean snapshot if enabled
         if self.camera_config.snapshots.clean_copy:
-            ret, png = cv2.imencode(".png", img_frame)
+            ret, webp = cv2.imencode(
+                ".webp", img_frame, [int(cv2.IMWRITE_WEBP_QUALITY), 80]
+            )
 
             if ret:
                 with open(
                     os.path.join(
                         CLIPS_DIR,
-                        f"{self.camera_config.name}-{event_id}-clean.png",
+                        f"{self.camera_config.name}-{event_id}-clean.webp",
                     ),
                     "wb",
                 ) as p:
-                    p.write(png.tobytes())
+                    p.write(webp.tobytes())
 
         # write jpg snapshot with optional annotations
         if draw.get("boxes") and isinstance(draw.get("boxes"), list):