Update app.py

app.py

@@ -144,7 +144,7 @@ def infer(video_in):
                '--original_args', 'ckpt/vta-ldm-clip4clip-v-large/summary.jsonl', 
                '--model', 'ckpt/vta-ldm-clip4clip-v-large/pytorch_model_2.bin', 
                '--data_path', folder_path,
-               '--max_duration', video_duration
+               '--max_duration', f"{video_duration}"
               ]
     process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, bufsize=1)