Update background.py

background.py

@@ -26,15 +26,13 @@ def generate_background(images, output_path):
         temp_videos.append(temp_video)
 
         vf = (
-            "scale=3840:2160:force_original_aspect_ratio=increase,"
-            "crop=3840:2160,"
-            f"zoompan="
-            f"z='1+0.30*on/{total_frames}':"
-            f"x='(iw-iw/zoom)/2':"
-            f"y='(ih-ih/zoom)/2':"
-            f"d={total_frames}:"
-            "s=3840x2160:"
-            f"fps={fps},"
+            "scale=4800:2700:force_original_aspect_ratio=increase,"
+            "crop=4800:2700,"
+            "crop="
+            "'3840+960*t/16':"
+            "'2160+540*t/16':"
+            "'(iw-(3840+960*t/16))/2':"
+            "'(ih-(2160+540*t/16))/2-120*t/16',"
             "scale=1920:1080:flags=lanczos"
         )