Update app.py

app.py

@@ -357,7 +357,7 @@ def create_subtitle_clips(subtitles, videosize, fontsize, font, color, debug):
         subtitle_y_position = video_height * 0.74
         text_position = (subtitle_x_position, subtitle_y_position)
         clip_to_overlay = CompositeVideoClip([color_clip.with_position(text_position), text_clip.with_position(text_position)])
-        clip_to_overlay = clip_to_overlay.set_position('center')
+        clip_to_overlay = clip_to_overlay.with_position('center')
         subtitle_clips.append(clip_to_overlay)
     
     return subtitle_clips