Deinterlacing of mencoder-encoded mpeg4 videos not working?

Hi there, 

I'm currently archiving the videos taken from my Sony DCR-SR200E video camera 
(MPEG2, interlaced, anamorphic: 720x576 -> 1024x576). I am converting them to 
mpeg4 to save space, while keeping the interlacing.

I can play the original mpeg2 videos in Xine player without any problem, 
turning on de-interlacing gives me gorgeous display. However, although Xine 
player plays my converted mpeg4 video fine too, the deinterlacing does not 
work, even if I enable it.

I use mencoder to convert my video (2 passes) as below:
# vopt="aspect=16/9:vbitrate=1600000:mbd=2:v4mv:ilme:ildct"
# 
# mencoder -oac mp3lame -lameopts abr:br=160 -ovc lavc -lavcopts 
vcodec=mpeg4:vpass=1:turbo:$vopt -passlogfile mpeg4_2pass.log -o 
test_me_mpeg4_p1.avi m2u00045.mpg
# 
# mencoder -oac mp3lame -lameopts abr:br=160 -ovc lavc -lavcopts 
vcodec=mpeg4:vpass=2:$vopt -passlogfile mpeg4_2pass.log -o 
test_me_mpeg4_p2.avi m2u00045.mpg


Is this a problem with mencoder or with the Xine de-interlace filter? Is there 
a solution for it?

Below are my config details:
running gentoo
xine-ui: 0.99.5
xine-lib: 1.1.7
mencoder: 1.0_rc1_p20070622-r4

Note: Using mplayer with the yadif de-interlace filter lets me play both the 
original mpeg2 and the encoded mpeg4 deinterlaced.


Thanks!
Tim.

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