Fix Number values and update return objects to stabilize startup

app.py

@@ -847,8 +847,8 @@ with gr.Blocks() as iface:
             )
         
         with gr.Row():
-            start_time = gr.Number(label="Start Time (seconds)", value=None, minimum=0)
-            end_time = gr.Number(label="End Time (seconds)", value=None, minimum=0)
+            start_time = gr.Number(label="Start Time (seconds)", value=0, minimum=0)
+            end_time = gr.Number(label="End Time (seconds)", value=0, minimum=0)
             verbose = gr.Checkbox(label="Verbose Output", value=False)
             include_timecodes = gr.Checkbox(label="Include timecodes in transcription", value=False)
 
@@ -871,9 +871,9 @@ with gr.Blocks() as iface:
             model_choices = get_model_options(pipeline_type)
             logging.info(f"Model choices for {pipeline_type}: {model_choices}")
             if model_choices:
-                return gr.update(choices=model_choices, value=model_choices[0], visible=True)
+                return gr.Dropdown(choices=model_choices, value=model_choices[0], visible=True)
             else:
-                return gr.update(choices=["No models available"], value=None, visible=False)
+                return gr.Dropdown(choices=["No models available"], value=None, visible=False)
         except Exception as e:
             logging.error(f"Error in update_model_dropdown: {str(e)}")
             return gr.update(choices=["Error"], value="Error", visible=True)