[MEncoder-users] videos contain black squares on Ipod touch

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I've got some x264 videos that I encoded a while ago, and when I put them
onto my ipod, there are random oblongs moving about, like one gets when
there's a missing p frame or something. They're fine on Quicktinme on the
PC, but not on the itouch. I've followed the guidance in the mencoder
quicktime section. Here's a sample command line:


MENCODER "infile"  -o "outfile.avi" -ovc x264  -x264encopts
 pass=1:bitrate=200:bframes=0:trellis=1:partitions=all:me=umh:direct=auto:no-8x8dct:ref=5:mixed_refs:fps=16
 -vf hqdn3d=2:1:2,scale=368:208,harddup -oac mp3lame -lameopts br=128 -ofps
16

(I encode the audio separately into aac, and mux it with mp4box)

Amongst many other attempts, I can remember doing the following to try and
eradicate the problem:

remove the mixed_refs and refs=5 options
used nocabac
kept the video at the original 25 fps without scaling
Removed the partitions=all option
Encoded without hqdn3d

Can anyone help me please??