tmnxVdoGrpSrcVqmUnrefPidErrSecs 1.3.6.1.4.1.6527.3.1.2.61.1.18.1.21

The value of tmnxVdoGrpSrcVqmUnrefPidErrSecs indicates the total number of unreferenced PID error seconds for the stream on this multicast channel.