Use loop filter.
@item qscale
Use fixed qscale.
-@item gmc
-Use gmc.
-@item mv0
-Always try a mb with mv=<0,0>.
-@item input_preserved
-
@item pass1
Use internal 2pass ratecontrol in first pass mode.
@item pass2
Set error[?] variables during encoding.
@item truncated
-@item naq
-Normalize adaptive quantization.
@item ildct
Use interlaced DCT.
@item low_delay