The current versions of ffmpeg seem to have removed the mp=eq2 filter and replaced it with plain eq= now. In addition the parameters seem to be rearranged as contrast, brightness, saturation, gamma, red gamma, green gamma, blue gamma and weight. All default levels seem to be the same at 1 except for brightness which is defaulted at 0.
This is noted at site https://wjwoodrow.wordpress.com/2015/07/12/more-ffmpeg-hell/
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indeed - they changing syntax more frequently than adding new important features or fixing serious limitations...