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Questions about switch SC output port and & DIS input port

use the latest SDK  02_0_0_09:

my software switch SC output port and DIS input port between OMX_CommandPortEnable and  OMX_CommandPortDisable as quickly as possible( According to the documentation says Dynamic modify port rule ).

at first ,it can work without any  err,but After tens of seconds,it can't  work,can't get the disable envent at the callback function. what's wrong?how can i do? 

thanx