Update gradio_app.py

gradio_app.py

@@ -250,6 +250,7 @@ def get_image(image, prompt, steps=50, cfg_scale=7.5, eta=1.0, fs=3, seed=123, i
         if len(prompt_str) == 0:
             prompt_str = 'empty_prompt'
 
+    global result_dir
     save_videos(batch_samples, result_dir, filenames=[prompt_str], fps=save_fps)
     print(f"Saved in {prompt_str}. Time used: {(time.time() - start):.2f} seconds")
     model = model.cpu()