enable random seed

app.py

@@ -64,7 +64,10 @@ def video_to_audio(video: gr.Video, prompt: str, negative_prompt: str, seed: int
                    cfg_strength: float, duration: float):
 
     rng = torch.Generator(device=device)
-    rng.manual_seed(seed)
+    if seed >= 0:
+        rng.manual_seed(seed)
+    else:
+        rng.seed()
     fm = FlowMatching(min_sigma=0, inference_mode='euler', num_steps=num_steps)
 
     video_info = load_video(video, duration)
@@ -101,7 +104,10 @@ def text_to_audio(prompt: str, negative_prompt: str, seed: int, num_steps: int,
                   duration: float):
 
     rng = torch.Generator(device=device)
-    rng.manual_seed(seed)
+    if seed >= 0:
+        rng.manual_seed(seed)
+    else:
+        rng.seed()
     fm = FlowMatching(min_sigma=0, inference_mode='euler', num_steps=num_steps)
 
     clip_frames = sync_frames = None
@@ -137,7 +143,7 @@ video_to_audio_tab = gr.Interface(
         gr.Video(),
         gr.Text(label='Prompt'),
         gr.Text(label='Negative prompt', value='music'),
-        gr.Number(label='Seed', value=0, precision=0, minimum=0),
+        gr.Number(label='Seed (-1: random)', value=-1, precision=0, minimum=-1),
         gr.Number(label='Num steps', value=25, precision=0, minimum=1),
         gr.Number(label='Guidance Strength', value=4.5, minimum=1),
         gr.Number(label='Duration (sec)', value=8, minimum=1),