In the example above the output is actually written by the filter, using the file name, given in the result= part (and then again in the input= part for the 2 nd-phase). The null is a ffmpeg-preserved phrase, for forced-format encoding, to essentially do not output anything from the encoder-phase, but to still run it, it is used in various filters that need to 'walk over' the video-frames, the output-file is usually handled by the filter, as one of its-given variables. ::- ::advance features (slower), in additional, the use of the 'unsharp' filter.
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