Problème d'affichage/Résolution en sortie Composite.

[2Fumanas]

**Salut à tous.
Depuis 2,3 jours j'essaye de configurer ma Recalbox, tout allait bien jusqu ce petit problème très irritant : L'image est déformé et/ ou dépasse de l'écran.

Ma Recalbox tourne sur un Raspberri Pi 4 B+, connecter via un cables composite RCA sur un vieille ecran LCD à Tube Sony.

TV SONY KLV-20SR3S
Aspect (ratio) :4:3
Diagonale :51 cm (20")
Définition :640 x 480

J'ai tout paramétré, suivi les tutos pour brancher en composite 4/3, regardé les forums, mais rien à faire.
J'ai essayé d'activer l'overscan : aucun effets, pas de changements.
J'ai l'impression qu'il y a un conflit ou un bug dans la résolution ou le ratio.. Je ne comprend pas.

config.txt :

############################################################################
# Boot loader configuration                                                #
# Warning: do not edit this file as it will be overwritten when upgrading! #
############################################################################

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

# if you plug your tv at the same time as your rpi and that the rpi switches from the hdmi or
# give a low resolution because tv had no enough time to initialize it
boot_delay=3

# disable boot rainbow
disable_splash=1

# default CEC name
cec_osd_name=recalbox

avoid_safe_mode=1

kernel=boot/linux
initramfs boot/initrd.gz

# force hdmi while the tv can take time before sending the signal on the hdmi output
#hdmi_force_hotplug=1

# total amount of GPU memory
gpu_mem=128

# your settings can be set in /boot/recalbox-user-config.txt
include recalbox-user-config.txt

# overclocking settings are automatically managed in this file
# do not remove this line, nor edit the file
include recalbox-oc-config.txt

# Raise the first security limit up to 70° instead of 60° for pi3 and pi4
[pi3]
temp_soft_limit=70
dtoverlay=vc4-kms-v3d
include crt/recalbox-crt-config.txt

[pi4]
arm_64bit=1
temp_soft_limit=70
dtoverlay=vc4-kms-v3d-pi4,composite=1
include crt/recalbox-crt-config.txt

# disable 4k resolution
hdmi_pixel_freq_limit:0=200000000
hdmi_pixel_freq_limit:1=200000000

[board-type=0x12]
dtoverlay=vc4-kms-v3d
include crt/recalbox-crt-config.txt

# custom config
[all]

user config :

# Change to your needs

# 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

config_hdmi_boost=0

# uncomment for composite PAL
#sdtv_mode=2

# uncomment for lirc-rpi
#dtoverlay=lirc-rpi

# uncomment if you have chinese TV display and display is garbled or slow
#hdmi_ignore_edid=0xa5000080

[pi4]
dtoverlay=vc4-kms-v3d-pi4,composite=1

[all]
dtoverlay=gpio-fan,gpiopin=14,temp=70000

sdtv_mode=2
hdmi_ignore_hotplug=1
hdmi_force_hotplug=0
audio_pwm_mode=2
enable_tvout=1
disable_fw_kms_setup=1
sdtv_aspect=1
overscan_scale=0

```**