How to fix the bad resolution of Sanyo Xacti videos

Vlc 0.8.6c version displays video recorded with my Sanyo Xacti C4 with a 320X240 resolution, instead of the correct 640X480.
The older versions of Vlc have not this problem that is related to a wrong information in the file. This information is used by the new version of Vlc, and not by the older versions.
To fix the problem I found some instructions here:
http://www.gnurou.org/blog/gnurou/2007/01/13/how_fix_bad_resolution_sanyo_xacti_videos
http://forum.videolan.org/viewtopic.php?f=2&t=33196

the better solution for me is:
Settings
Preferences
Input/Codecs
Demuxers
Tick the Advanced Options checkbox
Select FFmpeg demuxer in the dropdown

I had also another problem with the audio not working using the RPM packet in mandriva repository, I solved it using the packet in the PLF repository.