1. A method comprising: receiving one or more frames of a higher-resolution chroma sampling format; packing the one or more frames of the higher-resolution chroma sampling format into one or more frames of a lower-resolution chroma sampling format, wherein the packing includes: performing band separation filtering on sample values of chroma components of the one or more frames of the higher-resolution chroma sampling format to produce sample values of plural bands; and assigning the sample values of the plural bands to parts of the one or more frames of the lower-resolution chroma sampling format; and signaling an indication of type of the band separation filtering, wherein the type of the band separation filtering is selected from multiple band separation filtering schemes.