Trying to get pulseaudio to work with module-echo-cancel
Hello,
I'm trying to get pulseaudio to work.
I can record audio with the following command.

ffmpeg -f pulse -i doorpisource -ac 1 recording4.m4a

My configuration looks like this.
`"videoConfig": {
                        "source": "-i rtsp://192.168.178.183:8554/eingang -f pulse -i doorpisource -ac 1",
                        "subSource": "-i rtsp://192.168.178.183:8554/eingang -f pulse -i doorpisource -ac 1",
                        "stillImageSource": "-i http://192.168.178.35:88/cgi-bin/CGIProxy.fcgi?cmd=snapPicture2&usr=skunz&pwd=E4ooK5MH6qK3&",
                        "rtspTransport": "tcp",
                        "analyzeDuration": 0,
                        "probeSize": 2000,
                        "returnAudioTarget": "-f pulse doorpisink",
                        "maxStreams": 2,
                        "maxWidth": 1280,
                        "maxHeight": 720,
                        "maxFPS": 20,
                        "maxBitrate": 299,
                        "vcodec": "copy",
                        "acodec": "libfdk_aac",
                        "packetSize": 564,
                        "mapvideo": "0:v",
                        "mapaudio": "1:a",
                        "audio": true,
                        "debug": true,
                        "debugReturn": true`

But I get the following error message when I try to open the camera.

`[01/05/2022, 10:15:59] [CameraUI] Eingang: Starting video stream: native
[01/05/2022, 10:15:59] [CameraUI] Eingang: Stream command: /home/pi/bin/ffmpeg -hide_banner -loglevel verbose -rtsp_transport tcp -analyzeduration 0 -probesize 2000 -i rtsp://192.168.178.183:8554/eingang -f pulse -i doorpisource -ac 1 -an -sn -dn -vcodec copy -pix_fmt yuv420p -color_range mpeg -f rawvideo -payload_type 99 -ssrc 11319235 -f rtp -srtp_out_suite AES_CM_128_HMAC_SHA1_80 -srtp_out_params wSSTp0mheAqOIzOqcxX2CosYk3HBz0usHKQzpOwy srtp://192.168.178.142:63282?rtcpport=63282&pkt_size=564 -vn -sn -dn -acodec libfdk_aac -profile:a aac_eld -flags +global_header -f null -ar 16k -b:a 24k -ac 1 -payload_type 110 -ssrc 3897043 -f rtp -srtp_out_suite AES_CM_128_HMAC_SHA1_80 -srtp_out_params ZWRjHikOP2sT33G8EjlrbZLEcMKv/xdaplYVB4nR srtp://192.168.178.142:57312?rtcpport=57312&pkt_size=188 -progress pipe:1
[01/05/2022, 10:15:59] [CameraUI] Eingang: Stream command: /home/pi/bin/ffmpeg -hide_banner -loglevel verbose -protocol_whitelist pipe,udp,rtp,file,crypto -f sdp -c:a libfdk_aac -i pipe: -f pulse doorpisink
[01/05/2022, 10:15:59] [CameraUI] Eingang: [tcp @ 0x25c45b0] Starting connection attempt to 192.168.178.183 port 8554
[01/05/2022, 10:15:59] [CameraUI] Eingang: [tcp @ 0x25c45b0] Successfully connected to 192.168.178.183 port 8554
[01/05/2022, 10:15:59] [CameraUI] Eingang: [rtsp @ 0x25c1b50] SDP:
[01/05/2022, 10:15:59] [CameraUI] Eingang: v=0
[01/05/2022, 10:15:59] [CameraUI] Eingang: o=- 0 0 IN IP4 127.0.0.1
[01/05/2022, 10:15:59] [CameraUI] Eingang: s=Stream
[01/05/2022, 10:15:59] [CameraUI] Eingang: c=IN IP4 0.0.0.0
[01/05/2022, 10:15:59] [CameraUI] Eingang: t=0 0
[01/05/2022, 10:15:59] [CameraUI] Eingang: m=video 0 RTP/AVP 96
[01/05/2022, 10:15:59] [CameraUI] Eingang: a=rtpmap:96 H264/90000
[01/05/2022, 10:15:59] [CameraUI] Eingang: a=fmtp:96 packetization-mode=1;profile-level-id=420029; sprop-parameter-sets=Z00AH5WoFAFuQA==,aO48gA==
[01/05/2022, 10:15:59] [CameraUI] Eingang: a=control:trackID=0
[01/05/2022, 10:15:59] [CameraUI] Eingang: m=audio 0 RTP/AVP 0
[01/05/2022, 10:15:59] [CameraUI] Eingang: a=rtpmap:0 PCMU/8000/1
[01/05/2022, 10:15:59] [CameraUI] Eingang: a=control:trackID=1
[01/05/2022, 10:15:59] [CameraUI] Eingang: 
[01/05/2022, 10:15:59] [CameraUI] Eingang: [rtsp @ 0x25c1b50] setting jitter buffer size to 0
[01/05/2022, 10:15:59] [CameraUI] Eingang: [udp @ 0x1e11f10] attempted to set receive buffer to size 393216 but it only ended up set as 360448
[01/05/2022, 10:15:59] [CameraUI] Eingang: [udp @ 0x1e22260] attempted to set receive buffer to size 393216 but it only ended up set as 360448
[01/05/2022, 10:15:59] [CameraUI] Eingang: [sdp @ 0x1dfb2c0] setting jitter buffer size to 500
[01/05/2022, 10:15:59] [CameraUI] Eingang:     Last message repeated 1 times
[01/05/2022, 10:15:59] [CameraUI] Eingang: [h264 @ 0x25c5da0] Reinit context to 1280x720, pix_fmt: yuv420p
[01/05/2022, 10:15:59] [CameraUI] Eingang: [rtsp @ 0x25c1b50] Stream #0: not enough frames to estimate rate; consider increasing probesize
[01/05/2022, 10:15:59] [CameraUI] Eingang: Input #0, rtsp, from 'rtsp://192.168.178.183:8554/eingang':
[01/05/2022, 10:15:59] [CameraUI] Eingang:   Metadata:
[01/05/2022, 10:15:59] [CameraUI] Eingang:     title           : Stream
[01/05/2022, 10:15:59] [CameraUI] Eingang:   Duration: N/A, start: -0.615625, bitrate: N/A
[01/05/2022, 10:15:59] [CameraUI] Eingang:   Stream #0:0: Video: h264 (Main), 1 reference frame, yuv420p(progressive), 1280x720, 90k tbr, 90k tbn
[01/05/2022, 10:15:59] [CameraUI] Eingang:   Stream #0:1: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
[01/05/2022, 10:15:59] [CameraUI] Eingang: doorpisource: No such process
[01/05/2022, 10:15:59] [CameraUI]  ERROR  Eingang: FFmpeg exited with code: 1 and signal: null
[01/05/2022, 10:15:59] [CameraUI] Eingang: Stopped video stream.
[01/05/2022, 10:15:59] [CameraUI] Eingang: FFmpeg exited with code: null and signal: SIGKILL (Expected)
`

Has somebody an idea what is the problem?