Thanks Ism.
Canal savoir has better quality using:
http://stream2.canal.qc.ca/enOndes_haut_debit

That's right, all http channels works using mplayer however using mms i get smoother videos, i don't know if it is the case of others.

I collected some Arabic channels (actually most known) in the attached file (I don't know all their titles but i add most of them).

You can add these channels (or others) in:
/usr/share/applications/worldtv99/worldTV99.xml

You just have to copy the included file wherever you want in the xml file but outside any <group title=..> ... </group> section.