Can't get audio use -a ALAW

[centurion2021]

Describe the bug
I can run procss with -a ALAW -A 8000 without any error but no audio found in RTSP. if I remove audio options, then I can get audio in default format S16_BE successfully.

To Reproduce
Steps to reproduce the behavior:
hardware: Pi zero 2 W + ReSpeaker 2-Mics Pi HAT + raspberry camera v2
os: Raspberry OS lite(buster)
command: v4l2rtspserver -a ALAW -A 8000 -u unicast -P 554 -W 1920 -H 1080 -F 30 /dev/video0,plughw:CARD=seeed2micvoicec

Expected behavior
Get video along with audio(A-LAW)

Screenshots
root@raspberrypi:/dev/snd# v4l2rtspserver -a ALAW -A 8000 -u unicast -P 554 -W 1920 -H 1080 -F 30 /dev/video0,plughw:CARD=seeed2micvoicec
log level:500
[NOTICE] /root/install/v4l2rtspserver/main.cpp:294
Version: 0.2.4-8-g79a13bd live555 version:2021.12.18
[NOTICE] /root/install/v4l2rtspserver/src/V4l2RTSPServer.cpp:37
Create V4L2 Source.../dev/video0
[NOTICE] /root/install/v4l2rtspserver/v4l2wrapper/src/V4l2Device.cpp:133
driver:bm2835 mmal capabilities:85200005 mandatory:4000001
[NOTICE] /root/install/v4l2rtspserver/v4l2wrapper/src/V4l2Device.cpp:136
/dev/video0 support capture
[NOTICE] /root/install/v4l2rtspserver/v4l2wrapper/src/V4l2Device.cpp:138
/dev/video0 support read/write
[NOTICE] /root/install/v4l2rtspserver/v4l2wrapper/src/V4l2Device.cpp:139
/dev/video0 support streaming
[NOTICE] /root/install/v4l2rtspserver/v4l2wrapper/src/V4l2Device.cpp:225
/dev/video0:H264 size:1920x1080 bufferSize:2088960
[NOTICE] /root/install/v4l2rtspserver/v4l2wrapper/src/V4l2Device.cpp:246
fps:1/30
[NOTICE] /root/install/v4l2rtspserver/v4l2wrapper/src/V4l2Device.cpp:247
nbBuffer:1
[NOTICE] /root/install/v4l2rtspserver/v4l2wrapper/src/V4l2MmapDevice.cpp:49
Device /dev/video0
[NOTICE] /root/install/v4l2rtspserver/v4l2wrapper/src/V4l2MmapDevice.cpp:73
Device /dev/video0 nb buffer:10
[NOTICE] /root/install/v4l2rtspserver/src/V4l2RTSPServer.cpp:62
Create Source .../dev/video0
[NOTICE] /root/install/v4l2rtspserver/src/V4L2DeviceSource.cpp:96
begin thread
[NOTICE] /root/install/v4l2rtspserver/src/V4l2RTSPServer.cpp:184
Create ALSA Source...plughw:CARD=seeed2micvoicec
[NOTICE] /root/install/v4l2rtspserver/src/ALSACapture.cpp:49
Open ALSA device: "plughw:CARD=seeed2micvoicec"
[NOTICE] /root/install/v4l2rtspserver/src/ALSACapture.cpp:117
set sample format device: plughw:CARD=seeed2micvoicec to:21 ok
[NOTICE] /root/install/v4l2rtspserver/src/ALSACapture.cpp:104
ALSA device: "plughw:CARD=seeed2micvoicec" buffer_size:131072 period_size:64 rate:8000
[NOTICE] /root/install/v4l2rtspserver/src/V4L2DeviceSource.cpp:96
begin thread
[NOTICE] /root/install/v4l2rtspserver/inc/BaseServerMediaSubsession.h:49
format:video/H264
[NOTICE] /root/install/v4l2rtspserver/inc/BaseServerMediaSubsession.h:49
format:audio/PCMA/8000/2
[NOTICE] /root/install/v4l2rtspserver/inc/V4l2RTSPServer.h:80

root@raspberrypi:/dev/snd# arecord -L
null
Discard all samples (playback) or generate zero samples (capture)
jack
JACK Audio Connection Kit
pulse
PulseAudio Sound Server
default
playback
capture
dmixed
array
sysdefault:CARD=seeed2micvoicec
seeed-2mic-voicecard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0
Default Audio Device
dmix:CARD=seeed2micvoicec,DEV=0
seeed-2mic-voicecard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0
Direct sample mixing device
dsnoop:CARD=seeed2micvoicec,DEV=0
seeed-2mic-voicecard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0
Direct sample snooping device
hw:CARD=seeed2micvoicec,DEV=0
seeed-2mic-voicecard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0
Direct hardware device without any conversions
plughw:CARD=seeed2micvoicec,DEV=0
seeed-2mic-voicecard, bcm2835-i2s-wm8960-hifi wm8960-hifi-0
Hardware device with all software conversions
usbstream:CARD=seeed2micvoicec
seeed-2mic-voicecard
USB Stream Output

root@raspberrypi:/dev/snd# arecord -v -D plughw:CARD=seeed2micvoicec -t raw -f A_LAW -r 8000 -c 2 test_alaw.raw
Recording raw data 'test_alaw.raw' : A-Law, Rate 8000 Hz, Stereo
Plug PCM: A-Law conversion PCM (S16_LE)
Its setup is:
stream : CAPTURE
access : RW_INTERLEAVED
format : A_LAW
subformat : STD
channels : 2
rate : 8000
exact rate : 8000 (8000/1)
msbits : 8
buffer_size : 4000
period_size : 1000
period_time : 125000
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min : 1000
period_event : 0
start_threshold : 1
stop_threshold : 4000
silence_threshold: 0
silence_size : 0
boundary : 2097152000
Slave: Hardware PCM card 0 'seeed-2mic-voicecard' device 0 subdevice 0
Its setup is:
stream : CAPTURE
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 8000
exact rate : 8000 (8000/1)
msbits : 16
buffer_size : 4000
period_size : 1000
period_time : 125000
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min : 1000
period_event : 0
start_threshold : 1
stop_threshold : 4000
silence_threshold: 0
silence_size : 0
boundary : 2097152000
appl_ptr : 0
hw_ptr : 0

[TheAsuraSlayer]

Im having the same issue. Default codec is working fine. but not able to change it