[dvd::rip] dvdrip : preview image in Crop/Zoom tab are is not displayed

Hi,

I installed dvd::rip 0.52.7 and was able to rip and encode a dvd with ffmpeg.

One thing does not work:
The Crop/Zoom tab is supposed to display images to preview the result of crop 
and zoom.

But nothing is displayed in the first and last slots, and a black rectangle is 
displayed in the center slot.

I found the reason by looking at the dvdrip logfile:


<log>
Mon Jun 12 19:21:33 2006 Tâche terminée correctement (1) : Capture de 
l'aperçu - titre n°3 ,image n°31894
Mon Jun 12 19:21:33 2006 Executing command: 
identify /home/jerry/dvdrip/tmp/003-preview-orig.jpg
Mon Jun 12 19:21:33 2006 Executing command: 
convert /home/jerry/dvdrip/tmp/003-preview-orig.jpg -crop 
2x1+0+0 /home/jerry/dvdrip/tmp/003-preview-clip1.jpg
Mon Jun 12 19:21:33 2006 Executing command: 
identify /home/jerry/dvdrip/tmp/003-preview-clip1.jpg
Mon Jun 12 19:21:33 2006 Executing command: 
convert /home/jerry/dvdrip/tmp/003-preview-clip1.jpg -geometry '640!x360!' 
/home/jerry/dvdrip/tmp/003-preview-zoom.jpg
Mon Jun 12 19:21:34 2006 Executing command: 
identify /home/jerry/dvdrip/tmp/003-preview-zoom.jpg
Mon Jun 12 19:21:34 2006 Executing command: 
convert /home/jerry/dvdrip/tmp/003-preview-zoom.jpg -crop 
2x-7+0+4 /home/jerry/dvdrip/tmp/003-preview-clip2.jpg
</log>

Image 003-preview-orig.jpg is ok (and if I click on the first rectangle in 
Crop/Zoom, then the correct image is displayed in a popup window).

But then, building the other preview images, dvdrip ask to crop to a size of 
2x1 pixels:


<log>
Mon Jun 12 19:21:33 2006 Executing command: 
convert /home/jerry/dvdrip/tmp/003-preview-orig.jpg -crop 
2x1+0+0 /home/jerry/dvdrip/tmp/003-preview-clip1.jpg
</log>

Then zoom it to 640x360:

<log>
Mon Jun 12 19:21:33 2006 Executing command: 
convert /home/jerry/dvdrip/tmp/003-preview-clip1.jpg -geometry '640!x360!' 
/home/jerry/dvdrip/tmp/003-preview-zoom.jpg
</log>

So of course, zooming a 2x1 pixel image back to 640x360 gives a uniform color  
rectangle.

So the problem is that dvdrip gives the wrong instructions to convert, and 
then I cannot preview the cropping and zooming.

My config:
Gentoo linux on PPC architecture (iBook G4)
Kernel 2.6.15-gentoo-r1

Can someone help me figure that out ?

thanx
Jerry