Update app.py

app.py

@@ -46,7 +46,20 @@ with gr.Blocks() as app:
         results = model.predict(frame)
         render = render_result(model=model, image=frame, result=results[0])
         return render
-   
+    def fw_fn(cur,last):
+        if not int(cur)+1 > int(last):
+            next = int(cur)+1
+        else:
+            next = last
+            pass
+        return next
+    def bk_fn(cur):
+        if not int(cur)-1 < 0:
+            next = int(cur)-1
+        else:
+            next = 0
+            pass
+        return next
      
 
     with gr.Row():
@@ -65,6 +78,8 @@ with gr.Blocks() as app:
                 pl = gr.Button("Play")
                 fw = gr.Button(">")
             det_win = gr.Image(source="webcam", streaming=True)
+    bk.click(bk_fn,[cur_frame],cur_frame)
+    fw.click(fw_fn,[cur_frame,total_frames],cur_frame)
     load_button.click(load,youtube_url,[output_win,cur_frame,total_frames,fps_frames])
     run_button.click(vid_play, [output_win,cur_frame], det_win)