[FFmpeg-user] problem with trying maths in a filter

[Julian Gardner]

tried a few versions on varying machines but cant get this work, so can 
someone help me as to why these filters dont work

this
overlay=x=32+(mod(t/30,1)*448):y=32+(mod(t/60,1)*206)

or this
overlay=x=32+mul(mod(t/30,1),448):y=32+mul(mod(t/60,1),206)

I get this error

[AVFilterGraph @ 0x2c3a880] No such filter: '1)*448):y'

-- 
BR

Joolz