Hello,
I have found the solution.
Today I have found this article : https://learn.adafruit.com/neo…ry-pi/raspberry-pi-wiring
My problem was i had not connected a shifter between my PSU and the ledstrip.
I have connected a diode 1N4007 between VCC of my ledstrips and PSU and it works.
For other user that use the same hardware this how i connected all of my setup :
RPI 4 B connected with ledstrip
Pin 14 (GND) -- GND
Pin 32 (GPIO12) -- DIN
PSU - Ledstrip
VCC from both sides -- Diode 1N4007 -- V+ of PSU
GND from both sides -- V- of PSU
In the web configurator :
Led material : WS281X - number of yours leds - GPIO12
On SD card:
In config.txt : I have change dtparam=audio from "on" to "off"
I have change the extention of "config" and "cmdline" files from .txt to .conf
With this my ambilight works correctly. I must just do some ajustment for colors but that works.
Thank a lot for your help