The description tells techniques for coding of transform coefficients for one block of data of video. Of agreement with these techniques one of video encoder divides an unit of level of sheet of data of video is one of plurality of subsets of transformed coefficients. The of video encoder generates for one subset of the plurality of subsets of coefficients of transformed one of syntax element that indicates whether the subset includes or not anyone of the coefficients not null. In some examples the encoder of video may determine selectively whether of generated element of the syntax for each subset. One decoder may read one of encoded bit stream by which includes the entropy of syntax element and determining if the decoded based in the subset of syntax element.

This disclosure describes techniques for coding transform coefficients for a block of video data. According to these techniques a video encoder divides a leaf-level unit of video data into a plurality of transform coefficient sub-sets. The video encoder generates for a sub-set of the plurality of transform coefficient sub-sets a syntax element that indicates whether or not the sub-set includes any non-zero coefficients. In some examples the video encoder may selectively determine whether to generate the syntax element for each sub-set. A decoder may read an entropy encoded bit stream that includes the syntax element and determine whether to decode the sub-set based on the syntax element.