[dvd::rip] dvd::rip - error message

Hello,

I run dvd::rip on a 64 bits Ubuntu system. When I hit "transcode" button, I always get an error message. I tried many configurations but nothing changes...
Here is the error message :

Job 'Transcode video - title #1, pass 1' failed with error message:
Command exits with failure code:
Command: mkdir -m 0775 -p '/home/iorek/Videos/johnny_ringo/tmp' && cd /home/iorek/Videos/johnny_ringo/tmp && mkdir -p /home/iorek/Videos/johnny_ringo/avi/001 && execflow -n 19 transcode -H 10 -a 0 -x vob -i \/home\/iorek\/Videos\/johnny_ringo\/vob\/001\/ -w 724,50 -b 128,0,2 -s 2.336 --a52_drc_off -f 30,4 -M 2 -j 0,0,110,0 -Y 4,30,4,10 -Z 632x472 -R 1 -y xvid4,null --psu_mode --nav_seek /home/iorek/Videos/johnny_ringo/tmp/johnny_ringo-001-nav.log --no_split -o /dev/null --print_status 25 && echo EXECFLOW_OK

Output: transcode v1.0.7 (C) 2001-2003 Thomas Oestreich, 2003-2004 T. Bitterberg, 2004-2008 Transcode Team
libdvdread: Using libdvdcss version 1.2.9 for DVD access
libdvdread: Couldn't find device name.
libdvdnav:DVDOpenFilePath:findDVDFile /VIDEO_TS/VIDEO_TS.IFO failed
libdvdnav:DVDOpenFilePath:findDVDFile /VIDEO_TS/VIDEO_TS.BUP failed
libdvdread: Can't open file VIDEO_TS.IFO.
[import_vob.so] v0.6.0 (2003-10-02) (video) MPEG-2 | (audio) MPEG/AC3/PCM | (subtitle)
[export_null.so] v0.1.2 (2001-08-17) (video) null | (audio) null
[export_xvid4.so] v0.0.6 (2007-08-11) (video) XviD 1.0.x series (aka API 4.0) | (audio) MPEG/AC3/PCM
[export_xvid4.so] Reading configuration from './xvid4.cfg'
[export_xvid4.so] Reading config section 'features' from './xvid4.cfg'
[export_xvid4.so] Reading config section 'quantizer' from './xvid4.cfg'
[export_xvid4.so] Reading config section 'cbr' from './xvid4.cfg'
[export_xvid4.so] Reading config section 'vbr' from './xvid4.cfg'
(demuxer.c) seeking to sequence 0:0 ...
[decode_mpeg2.c] libmpeg2 acceleration: none (plain C)(demuxer.c) seeking to sequence 0:0 ...
Illegal instruction
[decode_mpeg2.c] failed to write Y data of frame (len=0)
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I tried to install dozens of packages with no result... Please give me any clue.

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