[FFmpeg-user] Problem with a lot a images to .avi

[Lautaro]

Hi list, I have this command to create a movie.avi from a lot (40)
images.jpg

$ffmpeg -r 0.25 -f image2 -i "imagen%d.jpg" -target pal-dvd -threads 4
-y alerces-01.mpg

The video resultate in an error, but I cannot say how... This is a link
from vid:
http://www.mediafire.com/?kklf48863bkr3lz
(38mb)

I hope any help, what's wrong with my command?
The video have 'vibrations' for talk any way.
Cheers.
Lautaro