[MEncoder-users] divx hardware player cannot seek or fast forward

[alee]

Hi, does anyone have any problem encoding using mencoder for divx files 
and the divx file cannot seek or fast forward in a hardware divx 
player?  I have a toshiba sd-k860.  Some files are able to seek and fast 
forward but some files cannot.  I use the same command line for everyone 
of them except the vbitrate and crop which I change as needed:

mencoder dvd://1 -ofps 24000/1001 -oac copy -vf \
filmdint,crop=704:448:8:14 -ovc lavc -lavcopts \
vcodec=mpeg4:vbitrate=1800:v4mv:mbd=1:autoaspect:vpass=1 -aid 128 \
-ffourcc DX50 -o output.avi

Do I need to add any other options?
Thanks.