A forward error correction (FEC) data generator comprises an input for at least two datastreams for which FEC data shall be generated in a joint manner, each datastream comprising a plurality of symbols. A FEC data symbol is based on a FEC source block possibly comprising a subset of symbols of the at least two data streams. The FEC data generator further comprises a signaling information generator configured to generate signaling information for the FEC data symbol regarding which symbols within the at least two datastreams belong to the corresponding source block by determining pointers to start symbols within a first and a second datastream, respectively, of the at least two datastreams and a number of symbols within the first datastream and second datastreams, respectively, that belong to the corresponding source block.