Temporal signalling for video coding technology

A method of encoding an input video into a plurality of encoded streams, such that the encoded streams may be combined to reconstruct the input video, the method comprising:

• receiving an input video comprising respective frames, each frame of the respective frames being divided into a plurality of tiles and each tile of the plurality of tiles being divided into a plurality of blocks;
• generating a base encoded stream using a base encoder;
• determining a temporal mode for one or more further encoded enhancement streams for use in reconstructing the input video together with the base encoded stream, the one or more further encoded enhancement streams being generated using an enhancement encoder, wherein the temporal mode is one of a first temporal mode that does not apply non-zero values from a temporal buffer for generating the one or more further encoded enhancement streams and a second temporal mode that does apply non-zero values from the temporal buffer for generating the one or more further encoded enhancement streams;
• generating the one or more further encoded enhancement streams based on data derived from the base encoded stream and the input video according to the determined temporal mode, wherein generating the one or more further encoded enhancement streams comprises applying a transform to each of a series of blocks of the plurality of blocks, and wherein the temporal mode is determined for one or more of a frame, tile, or block of the input video;
• determining the temporal mode for a second frame of the input video, subsequent to a first frame;
• and
• omitting a quantized value of a transformed block of the first frame from the one or more further encoded enhancement streams based on the temporal mode determined for the second frame, wherein the encoder is configured to use the temporal mode determined for the second frame to control a comparison between the quantized value and one or more thresholds to determine whether the quantized value is to be omitted.

A non-transitory computer-readable medium having stored therein computer executable instructions that when executed by a processor of a computing system cause the computing system to encode an input video into a plurality of encoded streams, such that the encoded streams may be combined to reconstruct the input video, the computing system caused to:

• receive an input video comprising respective frames, each frame of the respective frames being divided into a plurality of tiles and each tile of the plurality of tiles being divided into a plurality of blocks;
• generate a base encoded stream using a base encoder;
• determine a temporal mode for one or more further encoded enhancement streams for use in reconstructing the input video together with the base encoded stream, the one or more further encoded enhancement streams being generated using an enhancement encoder, wherein the temporal mode is one of a first temporal mode that does not apply non-zero values from a temporal buffer for generating the one or more further encoded enhancement streams and a second temporal mode that does apply non-zero values from the temporal buffer for generating the one or more further encoded enhancement streams;
• generate the one or more further encoded enhancement streams based on data derived from the base encoded stream and the input video according to the determined temporal mode, wherein generating the one or more further encoded enhancement streams comprises applying a transform to each of a series of blocks of the plurality of blocks, and wherein the temporal mode is determined for one or more of a frame, tile, or block of the input video;
• determining the temporal mode for a second frame of the input video, subsequent to a first frame;
• and
• omitting a quantized value of a transformed block of the first frame from the one or more further encoded enhancement streams based on the temporal mode determined for the second frame, wherein the encoder is configured to use the temporal mode determined for the second frame to control a comparison between the quantized value and one or more thresholds to determine whether the quantized value is to be omitted.