A solution is proposed for encoding/multiplexing programs of national television channels and at at least one group of regional channels. A plurality of encoders works in variable bit rate (each is called national or regional depending on whether it receives programs from a national or regional television channel). An aggregator device generates at least one piece of common information from the information coming from the regional encoders. A statistical allocator receives it along with information coming from national encoders and gives a dedicated set of encoding parameters to each national encoder and a common set of encoding parameters to the regional encoders. For each region, a multiplexer generates a multiplexed signal from output signals of the national encoders and from the output signal of the encoder associated with the regional channel of this region.