Update app.py

app.py

@@ -237,7 +237,7 @@ def process_video(source_path: str, target_path: str, enhance = False, progress=
             '-i', temp_frames_pattern,
             '-c:v', 'libx264',
             '-pix_fmt', 'yuv420p',
-            '-preset', 'normal',
+            '-preset', 'ultrafast',
             output_video_path
         ]
         
@@ -251,7 +251,7 @@ def process_video(source_path: str, target_path: str, enhance = False, progress=
             '-i', video_path,
             '-q:a', '0',
             '-map', 'a',
-            '-preset', 'normal',
+            '-preset', 'ultrafast',
             audio_path
         ]
         
@@ -266,7 +266,7 @@ def process_video(source_path: str, target_path: str, enhance = False, progress=
             '-c:v', 'copy',
             '-c:a', 'aac',
             '-strict', 'experimental',
-            '-preset', 'normal',
+            '-preset', 'ultrafast',
             output_video_path
         ]
         
@@ -285,7 +285,7 @@ def process_video(source_path: str, target_path: str, enhance = False, progress=
                 '-y',
             '-i', video_path,
             '-vf', "scale='if(gte(iw,ih),720,-1)':'if(gte(iw,ih),-1,720)',pad=ceil(iw/2)*2:ceil(ih/2)*2",
-                '-preset', 'normal',
+                '-preset', 'ultrafast',
             output_video_path
         ]
         subprocess.run(ffmpeg_command, check=True)