try loop

app.py

@@ -868,8 +868,8 @@ with gr.Blocks() as demo:
             
             generate_button = gr.Button("Load sample echocardiogram and generate result")
             with gr.Row():
-                video =  gr.PlayableVideo(autoplay=True) # gr.HTML() # 
-                plot =  gr.PlayableVideo(autoplay=True) # gr.HTML() # 
+                video =  gr.Video(loop='true') # gr.HTML() # 
+                plot =  gr.Video(loop='true') # gr.HTML() # 
             
             with gr.Row():
                 Rm = gr.Number(label="Mitral valve circuit resistance (Rm) mmHg*s/ml:")