Update app.py

app.py

@@ -38,8 +38,12 @@ with gr.Blocks() as ui:
         ]
 
         
-        call(cmd)
-        return "results/output.mp4"
+        process = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    
+        if process.returncode == 0:
+            result.value = "results/output.mp4"
+        else:
+            result.value = "Error: Failed to generate video"
 
     generate_btn.click(
         generate,