Geometric conversion for 360-degree video coding

A device comprising:

• a processor configured to:
• obtain a 360-degree video content, wherein the 360-degree video content is associated with an equirectangular a projection format, wherein the 360-degree video content comprises a chroma component associated with the equirectangular projection format and a luma component associated with the equirectangular projection format, and wherein the chroma component associated with the equirectangular projection format is unaligned with the luma component associated with the equirectangular projection format;
• determine a first chroma sample scheme associated with the obtained 360-degree video content, wherein the first chroma sample scheme indicates unalignment information between the chroma component associated with the equirectangular projection format and the luma component associated with the equirectangular projection format;
• based on the first chroma sample scheme, align the unaligned chroma component to the luma component for a projection format conversion, wherein the projection format conversion comprises converting the equirectangular projection format to a cubemap-based projection format, wherein aligning the unaligned chroma component to the luma component comprises aligning the unaligned chroma component to the luma component in a sampling grid based on the unalignment information associated with the first chroma sample scheme, wherein the sampling grid comprises aligned chroma and luma components, and wherein the aligned chroma component in the sampling grid is associated with a second chroma sampling scheme;
• and
• convert the aligned chroma and luma components in the sampling grid associated with the equirectangular projection format to the cubemap-based projection format.