Parallel video effects, mix trees, and related methods

A method of mixing video data inputs, the method comprising:

• mixing video data inputs in parallel according to mix parameter signals associated with one of the video data inputs, to provide a parallel mixed video data output;
• further mixing the parallel mixed video data output with a further video data input according to a composite mix parameter signal, the composite mix parameter signal corresponding to a product of mix parameter signals that are based on mix parameter signals respectively associated with multiple video data inputs.

An apparatus comprising:

• a plurality of video data mixing modules to mix video data inputs in parallel at one or more levels of a multi-level mix tree, the video data mixing modules comprising one or more video data mixing modules at each of the one or more levels to further mix parallel mixed video data outputs at the one or more levels with other video data inputs according to a respective composite mix parameter signal for each of the one or more video data mixing modules;
• a respective first truncation module coupled to each of the one or more video data mixing modules, to truncate the respective composite mix parameter signal for each of the one or more video data mixing modules based on a number of levels in the multi-level mix tree and an error tolerance and to provide a respective truncated composite mix parameter signal to each of the one or more video data mixing modules;
• a respective second truncation module coupled to each of the one or more video data mixing modules, to truncate respective video data output signals from each of the one or more video data mixing modules.

A method comprising:

• mixing video data inputs in parallel at one or more levels of a multi-level mix tree, the mixing comprising further mixing parallel mixed video data outputs at the one or more levels with other video data inputs according to one or more respective composite mix parameter signals;
• truncating the one or more respective composite mix parameter signals based on a number of levels in the multi-level mix tree and an error tolerance to generate one or more respective truncated composite mix parameter signals for the further mixing, the further mixing comprising further mixing the parallel mixed video data outputs at the one or more levels with the other video data inputs according to the one or more respective truncated composite mix parameter signals;
• truncating one or more respective video data output signals from the further mixing to a fractional precision based on the number of levels in the multi-level mix tree and the error tolerance.