1. A decoder for decoding a video from a data stream comprising syntax elements encoded therein, the decoder comprising: an entropy decoder configured to decode the syntax elements based on one or more of a plurality of contexts used in binary entropy decoding, wherein the entropy decoder is configured to initialize each of the plurality of contexts based on, for each context, a slope value and an offset value, wherein the slope value and the offset value are determined based on first and second four-bit parts of an 8-bit initialization value associated with the context; and a reconstructor configured to reconstruct the video based on the decoded syntax elements.
12. The decoder according to claim 1 , wherein the slope value is determined based on a first arithmetic operation that uses the first four-bit part of the 8-bit initialization value, and the offset value is determined based on a second arithmetic operation that uses the second four-bit part of the 8-bit initialization value.