A video includes a sequence of pictures, each including one or more slices. A bitstream is parsed to obtain a value of a first flag. Whether the value of the first flag indicates that a set of header extension parameters is present is determined. In response to the value of the first flag indicating that the set of header extension parameters is present, the bitstream is parsed to obtain a value of a second flag. Whether the value of the second flag indicates that a first parameter in the set of header extension parameters is enabled for the sequence is determined. In response to the value of the second flag indicating that the first parameter is enabled, the bitstream is parsed to obtain a value of the first parameter for one of the slices in the sequence. The slice is decoded based on the value of the first parameter.