problem to mix several remote sources with adder or mixer

[Jack]

Hello,

I am trying to mix several remote sources using uridecodebin (with uri
as http://) with either adder or audiomixer but it is not working if i
use more than 2 sources.
It is weird because if i try to use 3 audiofiles sources (with uri as
file:///), i can mix these 3 sources without problem.
I am sure that i missed something here, but what ?
Thanks for your help.

My configuration :
Ubuntu 18.04
GStreamer 1.14.1

++

Jack