The descriptors for detecting Dolby AC-4 in and MPEG-2 transport stream are defined in Specification for Service Information (SI) in DVB systems,ETSI EN 300 468 v1.15.1 (2016-3).


In professional application where Dolby AC-4 can be carried over SDI, the SMPTE ST-337 data type, as defined in SMPTE ST-338:2016 for Dolby AC-4 is 24.