when a try to launch kdenlive and after wizard I receive this message:

"Unknown media type in type 'unknown/mime-type'

kdenlive: symbol lookup error: kdenlive: undefined symbol: _ZN3Mlt8ConsumerC1ERNS_7ProfileEPcS3_ "

Can somebody help me?

TKS

Somebody can help me ....or not ??

When installing from the Wizard, you need to start Kdenlive using the command:

kdenlive_start

Also, you may try to delete the file $HOME/.kde/share/config/kdenliverc
if you had a previous Kdenlive version installed somewhere else...

I tried with that command but...no way...I still have the same prob's.

Looks very similar to http://www.kdenlive.org/mantis/view.php?id=772 with possible solution
You don't write which version of Kdenlive you are using. If it's 0.74 maybee it should be mlt 0.4 and libmlt++(2) 0.4 ?