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time mencoder input_file -ffourcc DX50 -forceidx -fps 25 -oac mp3lame -lameopts abr:br=160:aq=2 -ovc lavc -lavcopts vpass=1:turbo=1:threads=2:vcodec=mpeg4:vbitrate=1600:keyint=100:mbd=0:v4mv=1:trell=1:aspect=16/9 -vf scale=480:384 -sws 10 -o /dev/null

time mencoder input_file -ffourcc DX50 -forceidx -fps 25 -oac mp3lame -lameopts abr:br=160:aq=2 -ovc lavc -lavcopts vpass=2:turbo=0:threads=2:vcodec=mpeg4:vbitrate=1600:keyint=100:mbd=0:v4mv=1:trell=1:aspect=16/9 -vf scale=480:384 -sws 10 -o /tmp/out.avi

SwScaler: Bicubic spline scaler, from yuv420p to yuv420p using MMX2
SwScaler: using n-tap MMX scaler for horizontal luminance scaling
SwScaler: using n-tap MMX scaler for horizontal chrominance scaling
SwScaler: using n-tap MMX scaler for vertical scaling (YV12 like)
SwScaler: 720x576 -> 480x384
videocodec: libavcodec (480x384 fourcc=30355844 [DX50])
[mpeg4 @ 0x87316b8][lavc rc] Using all of requested bitrate is not necessary for this video with these parameters.