Imou Versa IPC-C22FP-C - no audio

[piotr-go]

Hello,
I managed to build the firmware for this camera, and everything seems to be working except for the audio.
The MPV receives the audio stream, but there's no sound.
Any ideas...?

root@openipc-ssc335:~# lsmod
Module                  Size  Used by    Tainted: P  
sensor_sc2336_mipi      5621  0 
mi_venc               159334  0 
mi_vpe                132610  0 
mi_vif                 39235  0 
mi_divp                48536  0 
mi_shadow              34375  0 
mi_sensor              21952  0 
mi_ao                  72914  0 
mi_ai                 194338  0 
mi_rgn                 74250  2 mi_vpe,mi_divp
mi_sys                415223  9 mi_venc,mi_vpe,mi_vif,mi_divp,mi_shadow,mi_sensor,mi_ao,mi_ai,mi_rgn
mi_common               5818 24 mi_venc,mi_vpe,mi_vif,mi_divp,mi_shadow,mi_sensor,mi_ao,mi_ai,mi_rgn,mi_sys
mhal                 1479105 10 sensor_sc2336_mipi,mi_venc,mi_vpe,mi_vif,mi_divp,mi_sensor,mi_ao,mi_ai,mi_rgn,mi_sys
ccm                     6577  2 
ssv6155               317642  0 
mac80211              261795  1 ssv6155
exfat                  48587  0

Camera Info:
SOC: SigmaStar SSC335
Sensor: SC2336
WiFi: SV6155P

GPIO:
46 - wifi
76,77 - IR filter
44 - IR LED
47 - White LED
61 - Green LED negated
79 - Red LED negated
80 - Speaker enable

UART:
Unpopulated header close to SSC335.
From the edge of the PCB: RX, TX, GND, 3V3

The commands don't work in the original bootloader, so I replaced the flash with one programmed with a new image.