Update app.py

app.py

@@ -163,11 +163,13 @@ def generate(
     image  = ImageOps.exif_transpose(Image.fromarray(tensor))
 
     prompt = prompt.strip('"')
+    if len(negative_prompt) == 0:
+        negative_prompt = None
     if negative_prompt:
         negative_prompt = negative_prompt.strip('"')
     
-    generator = torch.Generator(device).manual_seed(seed) if seed else None
-    
+    generator = torch.Generator(device).manual_seed(seed) if seed else None    
+
     video_pt = pipe(
         prompt=prompt,
         negative_prompt=negative_prompt,
@@ -371,7 +373,7 @@ with gr.Blocks() as demo:
         batch_video_frames, seed = generate(
             prompt,
             image_input,
-            negative_prompt=None,
+            negative_prompt=negative_prompt,
             num_inference_steps=50,
             guidance_scale=7.0,
             seed=seed_value,