Selection of multiple reference frames for weighted averaging probability model

A method of video encoding performed at a computing system having memory and one or more processors, the method comprising:

• receiving video data comprising a plurality of frames;
• identifying a set of reference frames for a current frame of the plurality of frames;
• selecting a primary reference frame from the set of reference frames, wherein the primary reference frame is a derived primary reference frame or is to be signaled;
• selecting a secondary reference frame from the set of reference frames, wherein selection of the secondary reference frame is based on whether the primary reference frame is to be signaled;
• obtaining respective contexts for the primary reference frame and the secondary reference frame;
• initializing a current frame context for the current frame by performing a weighted average of the respective contexts;
• and
• entropy encoding one or more parameters for the current frame using the current frame context.

A non-transitory computer-readable storage medium storing a video bitstream that is generated by a video encoding method, the video encoding method comprising:

• receiving video data comprising a plurality of frames;
• identifying a set of reference frames for a current frame of the plurality of frames;
• selecting a primary reference frame from the set of reference frames, wherein the primary reference frame is a derived primary reference frame or a signaled primary reference frame;
• selecting a secondary reference frame from the set of reference frames;
• obtaining respective contexts for the primary reference frame and the secondary reference frame;
• initializing a current frame context for the current frame by performing a weighted average of the respective contexts;
• and
• entropy encoding one or more parameters for the current frame using the current frame context;
• and
• wherein the video bitstream comprises the entropy-encoded parameters and encoded information for the current frame.