add error msg

vpu/vpu_live4.py

@@ -932,6 +932,9 @@ def loop_videoplayer():
                     ok = 1
             except Exception as e:
                 cprint("EXCEPTION loop_videoplayer ",e,color="red")
+                cprint(traceback.format_exc(),color="red")
+                cprint(sys.exc_info()[2],color="red")
+                cprint()
 
         if ok == 0:
             time.sleep(0.1)