Having trouble importing avi's (H264) in Vegas 12 64bits

Hi,

I'm running Sony Vegas Pro 12 64-bit. K-lite mega 32 bits is installed on my system as well as avisynth and Vdub 32 bits

First, I have tried to, directly import, the avi result's of a job of compression in Vdub with x264vfw. It failed.
Then, after some google searches, I installed ffdshow _tryouts 64 bits and ticked VFW option, as a 64 bit editors (like sony vegas) needs 64 bit codecs.

Great ! I was finally able to open my avi files.

Now I have a strange trouble; have a look at my screencast will be easier than explain the distortion of image and the colour shift to black&white (sorry for my bad english) :



Here you can compare both very close media info file's, corresponding to the capture picture:

http://cjoint.com/?CAAqlVQajit
http://cjoint.com/?CAAqNPp0xyE

Help, what's happening with this file ? (and all the clips, I'm now compressing with vdub) ?

THX

EDIT : hum, before compression, avi was a flv file ...



Even the avi result's of flv vdub compression cannot be properly "render" through avspmod :


I just can't understand how mpc-hc is able to play such a bad "damaged" video ...

Vegas is not responsible for my trouble