J'ai trouvé !!! Après de laborieuses recherches et des essais dans tous les sens, ça fonctionne parfaitement. Comme je suis sûr que je ne suis pas le seul, voici mes deux fichiers !
Bonne journée à tous.
Julien

BOOT/CONFIG.TXT

uncomment if you get no picture on HDMI for a default "safe" mode

#hdmi_safe=1

disable_overscan=1

uncomment to force a specific HDMI mode (this will force VGA)

#hdmi_group=1
#hdmi_mode=1

Sound output. Set to 0 or comment for autodetect, 1 for DVI, 2 to force HDMI.

#hdmi_drive=2

Using /etc/modules is deprecated and no longer supported on 4.4 kernel So manually enable audio

dtparam=audio=on

config_hdmi_boost=11

force hdmi while the tv can take time before sending the signal on the hdmi output

hdmi_force_hotplug=1

uncomment for composite PAL

#sdtv_mode=2

uncomment for lirc-rpi

#dtoverlay=lirc-rpi

if you plug your tv at the same time as your rpi and that the rpi switches from the hdmi or give a

boot_delay=3

uncomment if you don't want the rainbow at startup

disable_splash=1

default CEC name

cec_osd_name=recalbox

Overclock

gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=512

uncomment for composite PAL

#sdtv_mode=2

uncomment for lirc-rpi

#dtoverlay=lirc-rpi

if you plug your tv at the same time as your rpi and that the rpi switches from the hdmi or give a

boot_delay=3

uncomment if you don't want the rainbow at startup

disable_splash=1

default CEC name

cec_osd_name=recalbox

Overclock

gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=512

avoid_safe_mode=1

kernel=zImage
overscan_scale=0

RECALBOX.CONF

System Variable You can configure your recalbox from here To set a variable, remove the first ; on the line ------------ A - System Options ----------- Uncomment the system.power.switch you use

;system.power.switch=ATX_RASPI_R2_6 # http://lowpowerlab.com/atxraspi/#installation
;system.power.switch=MAUSBERRY # http://mausberry-circuits.myshopify.com/pages/setup
;system.power.switch=REMOTEPIBOARD_2003 # http://www.msldigital.com/pages/support-for-remotepi-board-2013
;system.power.switch=REMOTEPIBOARD_2005 # http://www.msldigital.com/pages/support-for-remotepi-board-plus-2015
;system.power.switch=WITTYPI # http://www.uugear.com/witty-pi-realtime-clock-power-management-for-raspberry-pi
;system.power.switch=PIN56ONOFF # https://github.com/recalbox/recalbox-os/wiki/Add-a-start-stop-button-to-your-recalbox-(EN)
;system.power.switch=PIN56PUSH # https://github.com/recalbox/recalbox-os/wiki/Add-a-start-stop-button-to-your-recalbox-(EN)
;system.power.switch=PIN356ONOFFRESET # https://github.com/recalbox/recalbox-os/wiki/Add-a-start-stop-button-to-your-recalbox-(EN)
;system.power.switch=PIN356PUSHRESET # https://github.com/recalbox/recalbox-os/wiki/Add-a-start-stop-button-to-your-recalbox-(EN)

fbcp FrameBuffer Copy Program For small TFT screen on GPIO and SPI See https://github.com/recalbox/recalbox-os/wiki/Utility---Use-of-fbcp-for-small-TFT-screen-(EN) for details Needed for Waveshare 3.2" 3.5" TFT screen, 2.8" Adafruit screen See https://github.com/recalbox/recalbox-os/wiki/TFT-Screen-SPI-Bus-(EN) for support and configuration details needed by /boot/config.txt

system.fbcp.enabled=0

Recalbox Manager (http manager)

system.manager.enabled=1

1 or 2, depending on the manager version you wish

system.manager.version=2

Recalbox security enforce security samba password required disable virtual gamepads

system.security.enabled=0

Recalbox API (REST)

system.api.enabled=0

Allow a specific resolution for ES only from the command : tvservice -m [MODE] Leave commented for the default usual behaviour

system.es.videomode=CEA 4 HDMI

EmulationStation menu style default -> default all options menu none -> no menu except the game search menu bartop -> less menu, only needed for bartops

emulationstation.menu=default

Select a system to show on boot (use rom directory name) (string)

emulationstation.selectedsystem=favorites

Show the gamelist of the first or selected system on boot (0,1)

emulationstation.bootongamelist=0

Disable system view ES will boot and show ONLY the first or selected system (0,1)

emulationstation.hidesystemview=0

Pa**e Gamelists only. Show only games listed in gamelist.xml files (0,1)

emulationstation.gamelistonly=0

Force basicgameList view to be displayed, even if your game systems are scraped (0,1)

emulationstation.forcebasicgamelistview=0

Emulator special keys default -> default all special keys nomenu -> cannot popup the emulator menu none -> no special keys in emulators

system.emulators.specialkeys=default

Show or hide kodi in emulationstation (0,1)

kodi.enabled=1

Start kodi at launch (0,1)

kodi.atstartup=0

set x button shortcut (0,1)

kodi.xbutton=1

Allow a specific resolution for Kodi only from the command : tvservice -m [MODE] By default is using the default resolution of your screen

kodi.videomode=default

Kodi can wait for a network component before starting waithost is the ip or hostname that must answer to a ping to validate the availability waittime is the maximum time waited when kodi boots if waitmode is required, kodi will not start if the component is not available if waitmode is wish, kodi will start if the component is not available if waitmode is not set or has another value, kodi will start immediately

;kodi.network.waitmode=required
;kodi.network.waittime=10
;kodi.network.waithost=192.168.0.50

Hyperion Hyperion allows you to use an ambilight like led system on your recalbox Use hypercon to create your configuration file, and copy it in /recalbox/share/system/configs/hyperion/hyperion.config.json

hyperion.enabled=0

------------ B - Network ------------ Set system hostname

system.hostname=RECALBOX

Activate wifi (0,1)

wifi.enabled=0

Wifi SSID (string)

wifi.ssid=neoricki2

Wifi KEY (string) after rebooting the recalbox, the "new key" is replace by a hidden value "enc:xxxxx" you can edit the "enc:xxxxx" value to replace by a clear value, it will be updated again at the following reboot Escape your special chars (# ; $) with a backslash : $ => $

wifi.key=enc:U2FsdGVkX1+VflNSMv1PfJtV+8jLF/mRvQs/XWD7RNcvXgWgYi/6JOCswlxjYFjt

secondary wifi (not configurable via the user interface)

wifi2.ssid=NEORICKI2
wifi2.key=enc:U2FsdGVkX199inwMVOzuy/edABLpJYeHZuGtItiaqj87ceIFGMG/rksg9p12lW4s

third wifi (not configurable via the user interface)

;wifi3.ssid=new ssid
;wifi3.key=new key

Samba share

system.samba.enabled=1

Virtual Gamepads

system.virtual-gamepads.enabled=1

SSH

system.ssh.enabled=1

------------ C - Audio ------------ Set the audio device (auto, hdmi, jack)

audio.device=

Set system volume (0..100)

audio.volume=80

Enable or disable system sounds in ES (0,1)

audio.bgmusic=1

-------------- D - Controllers ----------------- Enable support for standard bluetooth controllers

controllers.bluetooth.enabled=1

Please enable only one of these -------------- D1 - PS3 Controllers ------------

##Enable PS3 controllers support
controllers.ps3.enabled=1

Choose a driver between bluez, official and shanwan bluez -> bluez 5 + kernel drivers, support official and shanwan sisaxis official -> sixad drivers, support official and gasia sisaxis shanwan -> shanwan drivers, support official and shanwan sisaxis

controllers.ps3.driver=bluez

------------ D2 - GPIO Controllers ------------ GPIO Controllers enable controllers on GPIO with mk_arcarde_joystick_rpi (0,1)

controllers.gpio.enabled=0

mk_gpio arguments, map=1 for one controller, map=1,2 for 2 (map=1,map=1,2)

controllers.gpio.args=map=1,2

------------ D3 - Steam Controllers ------------ Enable steam controller service

controllers.steam.enabled=0

DB9 Controllers Enable DB9 drivers for atari, megadrive, amiga controllers (0,1)

controllers.db9.enabled=0

db9 arguments

controllers.db9.args=map=1

Gamecon controllers Enable gamecon controllers, for nes, snes psx (0,1)

controllers.gamecon.enabled=0

gamecon_args

controllers.gamecon.args=map=1

XGaming's XArcade Tankstik and other compatible devices

controllers.xarcade.enabled=1

------------ F - Language and keyboard ------------ Set the language of the system (fr_FR,en_US,en_GB,de_DE,pt_BR,es_ES,it_IT,eu_ES,tr_TR,zh_CN)

system.language=fr_FR

set the keyboard layout (fr,en,de,us,es)

system.kblayout=us

Set you local time Select your timezone from : ls /usr/share/zoneinfo/ (string)

system.timezone=Europe/Paris

------------ G - UPDATES ------------ Automatically check for updates at start (0,1)

updates.enabled=1

Update type : default to stable

updates.type=stable

------------ H - HERE IT IS - GLOBAL EMULATOR CONFIGURATION ------------ The global value will be used for all emulators, except if the value is redefined in the emulator Set game resolution for emulators select your mode from the command : tvservice -m [MODE] CEA 5 HDMI : 1920x1080 @ 60Hz 16:9, clock:74MHz interlaced CEA 4 HDMI : 1280x720 @ 60Hz 16:9, clock:74MHz progressive use 'default' for using the default resolution use 'auto' : switches to CEA 4 HDMI if supported, else keep the current resolution (string)

global.videomode=CEA 4 HDMI

Shader set Automatically select shaders for all systems

## (none, retro, scanlines)
global.shaderset=none

Once enabled, your screen will be cropped, and you will have a pixel perfect image (0,1)

global.integerscale=0

Set gpslp shader for all emulators (prefer shadersets above). Absolute path (string)

global.shaders=

Set ratio for all emulators (auto,4/3,16/9,16/10,custom)

global.ratio=auto

Set smooth for all emulators (0,1)

global.smooth=0

Set rewind for all emulators (0,1)

global.rewind=0

Set autosave/load savestate for all emulators (0,1)

global.autosave=0

Enable retroarchievements (0,1) Set your www.retroachievements.org username/password Escape your special chars (# ; $) with a backslash : $ => $

global.retroachievements=0
global.retroachievements.hardcore=0
global.retroachievements.username=
global.retroachievements.password=

Set retroarch input driver (auto, udev, sdl2) If you don't have issues with your controllers, let auto

global.inputdriver=auto

If you do not want recalboxOS to generate the configuration for all emulators (string)

;global.configfile=/path/to/my/configfile.cfg

------------ I - EMULATORS CHOICES ----------- You can override the global configuration here Here is the snes example

;snes.videomode=CEA 4 HDMI
snes.core=snes9x
;snes.shaders=/recalbox/share/shaders/shaders_glsl/mysnesshader.gplsp
;snes.ratio=16/9
;snes.smooth=0
;snes.rewind=1
;snes.autosave=0
snes.emulator=libretro
;snes.integerscale=0

If you do not want recalboxOS to generate the configuration for the emulator :

;snes.configfile=/path/to/my/configfile.cfg

Default cores for RPi3

snes.core=snes9x
gba.core=mgba
mame.core=mame078
nes.core=fceunext

NeoGeo emulator You can use pifba or a libretro core (fba2x,libretro)

neogeo.emulator=libretro

If you set libretro as neogeo.emulator, the line below sets the retroarch core (fba,imame4all)

neogeo.core=fba

N64 emulator is configured to display a screen with a 640x480 resolution (native n64 resolution) So you must use one of these video modes (DMT 4 HDMI,CEA 1 HDMI). If your screen is not compatible with one of these video modes, please check the recalbox's wiki.

##n64.videomode=CEA 1 HDMI
n64.videomode=CEA 4 HDMI

If you are using a CRT screen, please change the setting above with this one : n64.videomode=default Dreamcast emulator Like N64, such a CPU intensive emulator needs a small resolution Consider DMT 4 HDMI (640480) or DMT 9 HDMI (800600). If you have a black screen on dreamcast, try DMT 9 HDMI here

dreamcast.videomode=DMT 4 HDMI

Configurations generated by Recalbox

snes MSU-1.emulator=libretro
snes MSU-1.autosave=1
snes MSU-1.core=snes9x
n64.emulator=mupen64plus
n64.core=rice
n64.rewind=0
n64.smooth=0
n64.ratio=squarepixel

system.kblayout=us
system.timezone=Europe/Paris
wifi2.ssid=NEORICKI2
wifi2.key=enc:U2FsdGVkX199inwMVOzuy/edABLpJYeHZuGtItiaqj87ceIFGMG/rksg9p12lW4s

@oyyodams Merci de ta réponse, j'ai booté sur Libreelec et j'avais le même soucis.

Et au passage quand la résolution est en 720p ou 1020p max (je crois je me souviens plus) j'ai strictement aucunes coupures.

ça fait que je suppose que y'a pas assez de power dans l'adaptateur...

ça me saoule de devoir en racheter un autre alors que pourtant il arrive à transmettre du 1080p 😕

Ok très bien merci je vais le changer