Simple tutorial:
-Install the SilverSpoof.user.js Greasemonkey script form the 'scripts/'
-directory, then visit a page on the Rai.tv site which is using Smooth
-Streaming, look at the source page and search for the 'mediaUri' string, this
-is most likely the client Manifest, or the address of a playlist containing
-the client Manifest.
+The "manifest file" needed by smooth-dl can be retrieved in several ways:
+
+ - Install the SilverSpoof.user.js Greasemonkey script form the 'scripts/'
+ directory, then visit a page on the Rai.tv site which is using Smooth
+ Streaming, look at the source page and search for the 'mediaUri' string,
+ this is most likely the client Manifest, or the address of a playlist
+ containing the client Manifest.
+
+ - Alternatively you can install the "Direct Download Links" Greasemonkey
+ script from http://userscripts.org/scripts/show/108910 and you will get
+ a "Direct Link" to the *.csm file, just do "Copy Link Location" and use it
+ like in the smooth-dl lines below.
View the Manifest of some RAI content:
./smooth-dl.py -i "http://smoothreplay.rai.it/ReplayTV/manifests/38640.csm"