temporal noise reducer
                     1. <= 2. <= 3.            larger -> stronger filtering
fq     forceQuant      <quantizer>             force quantizer
Usage:
<filterName>[:<option>[:<option>...]][[,|/][-]<filterName>[:<option>...]]...
long form example:
vdeblock:autoq/hdeblock:autoq/linblenddeint    default,-vdeblock
short form example:
vb:a/hb:a/lb                                   de,-vb
more examples:
tn:64:128:256