Video decoder chipset

A method of processing virtual reality video data at a virtual reality device, the virtual reality device comprising a video decoder chipset, the video decoder chipset comprising a video decoder function, an upscaler function, and a combiner function, the method comprising:

• decoding, at the video decoder function, encoded video data to generate decoded video data at a first level of quality, the encoded video data having been derived by an encoder using first video data at a second, higher level of quality;
• upscaling, at the upscaler function, data derived from the decoded video data to generate second video data at the second level of quality;
• and
• combining, at the combiner function, residual data with the second video data to generate enhanced video data, the residual data having been derived by an encoder by downscaling the first video data to obtain a downscaled version of the first video data, upscaling the downscaled version of the first video data to obtain a preliminary version of the first video data, and comparing the preliminary version of the first video data with the first video data at the second, higher level of quality,
• wherein the second video data is generated on a tile-by-tile basis, a tile corresponding to a group of pixels within an image of the video data.