[MPlayer-users] Encoding with libx264

[bugzzzz]

Hello,

I am new to this mailing list.
And as there is no forum or other place to look for issues already posted, here is my problem :

I have just compiled mplayer-checkout-2017-10-17 to test libx264 codec.
http://www.mplayerhq.hu/DOCS/HTML/en/MPlayer.html#menc-feat-x264 recommend for example the following options for high quality encoding :
subq=5:8x8dct:frameref=2:bframes=3:b_pyramid=normal:weight_b

But when I run the 1st pass encoding process, I get the following result :
/usr/local/mplayer-checkout-2017-10-17/bin/mencoder //home/azor/tmp/t1c1  -nosound -ovc lavc -lavcopts vcodec=libx264:vbitrate=1000:subq=5:8x8dct:frameref=2:bframes=3:b_pyramid=normal:weight_b:turbo:vpass=1 -vf pp=,scale=-1 -o /dev/null

MEncoder UNKNOWN-4.9.2 (C) 2000-2017 MPlayer Team
Option lavcopts: Unknown suboption 8x8dct
Error parsing option on the command line: -lavcopts

Exiting... (error parsing command line)

It seems that "8x8dct" option is not recognized by mencoder whereas it is documented in http://www.mplayerhq.hu and mplayer/mencoder man pages.

Could you tell me more about this option ?

Thanks a lot.