A method of encoding a video frame into a bitstream is described including: applying a downsampling scheme to an original video frame of a first resolution for determining a first low-resolution, LR, original frame and one or more second original LR frames, the first LR original frame and the one or more second LR original frames being of a second resolution that is lower than the first resolution; partitioning the first LR original frame into first original blocks and partitioning the one or more second LR frames into second original blocks; using a prediction method for determining first predicted blocks, the first predicted blocks defining predictions for the first original blocks of the first LR original frame; determining first residual blocks based on the first predicted blocks and the first original blocks and, subsequently, determining first reconstructed blocks based on the first residual blocks and the first predicted blocks; determining second predicted blocks based on the first reconstructed blocks, the second predicted blocks defining predictions for the second original blocks of the one or more second LR original frames; determining second residual blocks based on the second predicted blocks and the second original blocks; and, transforming the first residual blocks and second residual blocks into a bitstream, the bitstream including metadata for signalling a decoder apparatus that during the encoding a downsampling scheme was used for downsampling the video frame.