1. A method of processing an MPEG-2 transport stream for carriage of multi-layer video data, the method comprising: obtaining, from a first descriptor for a program comprising one or more elementary streams, a plurality of profile, tier, level (PTL) syntax element sets, each respective PTL syntax element set of the plurality of PTL syntax element sets comprising syntax elements specifying respective PTL information; obtaining, from the first descriptor or a second descriptor for the program, a plurality of operation point syntax element sets, wherein the first descriptor and the second descriptor are in a program map table of the MPEG-2 transport stream and each respective operation point syntax element set of the plurality of operation point syntax element sets specifies a respective operation point of a plurality of operation points; and for each respective operation point syntax element set of the plurality of operation point syntax element sets, determining, for each respective layer of the respective operation point specified by the respective operation point syntax element set, based on a respective syntax element for the respective layer, which of the PTL syntax element sets specifies the PTL information assigned to the respective layer of the respective operation point, the respective syntax element being in the respective operation point syntax element set, the respective operation point having a plurality of layers.