Cannot get mencoder binary to work...

I've got an .mp4 file that I'm trying to convert to .avi with subtitles. When trying to encode to .mpeg avi (mencoder) I get the following error:

[h264 @ 0x878f8c]abs_diff_pic_num overflow
[h264 @ 0x878f8c]decode_slice_header error
[h264 @ 0x878f8c]illegal short term buffer state detected
[h264 @ 0x878f8c]concealing 1728 DC, 1728 AC, 1728 MV errors
h264.c:4128: failed assertion `h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count'

mencoder XviD gives me the same. mpeg4 ffmpeg gives me:

Encoding started on Fri Jan 11 15:46:05 PST 2013
FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
Mac OSX universal build for ffmpegX
libavutil version: 49.0.0
libavcodec version: 51.9.0
libavformat version: 50.4.0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Volumes/HOTARUBI/Movies/RUROUNI KENSHIN.2012.BDRip.576p.x264.AAC/Rurouni Kenshin Live Action - subtitles by Aeslis.mp4':
Duration: 02:14:27.1, start: 0.000000, bitrate: 1825 kb/s
Stream #0.0(und), 23.98 fps(r): Video: h264, yuv420p, 1024x428
Stream #0.1(jpn): Audio: aac, 48000 Hz, 5:1
Can't resample. Aborting.
Abort at ffmpeg.c:1628
/bin/sh: line 1: 84266 Abort trap

Any advice greatly appreciated!