(Sorry for English language; i'm French

I have installed Mumble (1.2.2 in a first time) from the repository "Core Release", and after, i updated Mumble (1.2.3) from "Core Update Testing", but I have a problem with the Sound.
The message send by Mumble is : "Cannot find CELT codecs corresponding to other users. You will not be able to talk to other users."
On the web, they advise to use CELT 0.7.1 with Mumble 1.2.3, but in the repository Mageia, it's CELT 0.10.0.
When I talk on Mumble, my "mouth" is "red" and when I stop talk, my "mouth" is "gray"; but, the others can not hear me.
I can not hear others speak too.
I configured Mumble the same way as Windows but .. no sound.
However, the audio test works perfectly, I get to speak, and hear the synthesized voice speaking to me.
I think it's a problem with CELT plugin.
Does someone have the same problem?
For information, Teamspeak and Skype work without worries.
Thanks For your help !