fec of the low priority stream is NONE if hierarchy is disabled
the replaced values are either AUTO, 1/2 (that's due to EN300468 signalling)
or are the same as the fec of the high priority stream
fec of the low priority stream is NONE if hierarchy is disabled
the replaced values are either AUTO, 1/2 (that's due to EN300468 signalling)
or are the same as the fec of the high priority stream