Embodiments of the present disclosure provide a solution for visual data processing. A method for visual data processing is proposed. The method comprises: performing a conversion between visual data and a bitstream of the visual data with a neural network (NN)-based model, wherein a first format for coding the visual data and a second format of output visual data from the conversion are indicated with different indications, the first format indicates a first relationship between a size of a first component of the coded visual data and a size of a second component of the coded visual data, and the second format indicates a second relationship between a size of a first component of the output visual data and a size of a second component of the output visual data.