Récupération de la première image d'un fichier AVI

Bonjour,

J'ai r=E9ussi =E0 convertir un fichier .mov en .avi par les commandes suiva=
ntes :

mencoder toto.mov -ovc lavc -lavcopts vcodec=3Dmpeg4:vpass=3D1 -oac
mp3lame -lameopts br=3D128:cbr:vol=3D0:mode=3D0 -o toto.avi
mencoder toto.mov -ovc lavc -lavcopts vcodec=3Dmpeg4:vpass=3D2 -oac
mp3lame -lameopts br=3D128:cbr:vol=3D0:mode=3D0 -o toto.avi

(j'ai trouv=E9 cela sur le web ;) ).

J'aimerais extraire la premi=E8re image du fichier pour faire un menu
sur un dvd avec kino par exemple (=E0 moins que nous ne me conseilliez
d'autres outils).
Je ne parviens pas =E0 utiliser transcode pour le faire.

J'ai essay=E9 :

transcode -a 0 -c 1 -x dv -i toto.avi -y jpg -o toto.jpg

J'obtiens ceci :

transcode v1.0.2 (C) 2001-2003 Thomas Oestreich, 2003-2004 T. Bitterberg
[transcode] (probe) suggested AV correction -D 0 (0 ms) | AV 0 ms | 0 ms
[transcode] auto-probing source toto.avi (ok)
[transcode] V: import format | unknown RIFF data, AVI (V=3Ddv|A=3D(null)=
)
[transcode] V: import frame | 320x240 1.33:1
[transcode] V: bits/pixel | 1.170
[transcode] V: decoding fps,frc | 20.033,0
[transcode] V: Y'CbCr | YV12/I420
[transcode] A: import format | 0x55 MPEG layer-3 [16000,16,2] 128 kb=
ps
[transcode] A: export format | 0x55 MPEG layer-3 [16000,16,2] 128 kb=
ps
[transcode] V: encoding fps,frc | 20.033,0
[transcode] A: bytes per frame | 3196 (3194.666667)
[transcode] A: adjustment | -1332@1000
[transcode] V: IA32/AMD64 accel | sse (sse 3dnowext 3dnow mmxext mmx asm C)
tc_memcpy: using sse for memcpy
[transcode] V: video buffer | 10 @ 320x240
[import_dv.so] v0.3.1 (2003-10-14) (video) DV | (audio) PCM
[export_jpg.so] v0.2.1 (2003-08-06) (video) *
[import_dv.so] tcextract -x dv -i "toto.avi" -d 0 | tcdecode -x dv -y pcm -=
d 0
[import_dv.so] tcextract -x dv -i "toto.avi" -d 0 | tcdecode -x dv -y
yv12 -d 0 -Q 5
tc_memcpy: using sse for memcpy
tc_memcpy: using sse for memcpy
sh: line 1: 4720 Relais bris=E9 (pipe) tcextract -x dv -i "toto.avi" -=
d 0
4721 Erreur de segmentation | tcdecode -x dv -y yv12 -d 0 -Q 5
# no audio
# no audio
# no audio
# no audio

clean up | frame threads | unload modules | cancel signal | internal
threads | done
[transcode] encoded 0 frames (0 dropped, 0 cloned), clip length 0.00 s

si j'essaye l'option -x avi, j'obtiens :
transcode v1.0.2 (C) 2001-2003 Thomas Oestreich, 2003-2004 T. Bitterberg
[transcode] (probe) suggested AV correction -D 0 (0 ms) | AV 0 ms | 0 ms
[transcode] auto-probing source toto.avi (ok)
[transcode] V: import format | unknown RIFF data, AVI (V=3Davi|A=3D(null=
))
[transcode] V: import frame | 320x240 1.33:1
[transcode] V: bits/pixel | 1.170
[transcode] V: decoding fps,frc | 20.033,0
[transcode] V: Y'CbCr | YV12/I420
[transcode] A: import format | 0x55 MPEG layer-3 [16000,16,2] 128 kb=
ps
[transcode] A: export format | 0x55 MPEG layer-3 [16000,16,2] 128 kb=
ps
[transcode] V: encoding fps,frc | 20.033,0
[transcode] A: bytes per frame | 3196 (3194.666667)
[transcode] A: adjustment | -1332@1000
[transcode] V: IA32/AMD64 accel | sse (sse 3dnowext 3dnow mmxext mmx asm C)
tc_memcpy: using sse for memcpy
[transcode] V: video buffer | 10 @ 320x240
[import_avi.so] v0.4.2 (2002-05-24) (video) * | (audio) *
Video format not supported by import module
Please try --uyvy or --use_rgb
[transcode] failed to init import modules
[transcode] critical: plug-in initialization failed


Qu'ai je omis ?

Merci.
Patrice.