[fatal] Unknown input format: 'alsa' / [Logitech-C525] FFmpeg exited with code: 1 and signal: null (Error)
Hello,

i want to use my Logitech c525 in HomeKit. 
config of my camera:
{
            "name": "Camera FFmpeg",
            "cameras": [
                {
                    "name": "Logitech-C525",
                    "videoConfig": {
                        "source": "-f alsa -ac 1 -ar 44100 -thread_queue_size 2048 -i plughw:CARD=C525,DEV=0 -re -f video4linux2 -i /dev/video0 -vsync 0 -af aresample=async=1",
                        "stillImageSource": "-s 1280x720 -f video4linux2 -i /dev/video0",
                        "maxStreams": 2,
                        "maxWidth": 1280,
                        "maxHeight": 720,
                        "maxFPS": 30,
                        "packetSize": 188,
                        "mapvideo": "1",
                        "mapaudio": "0",
                        "audio": true,
                        "debug": true
                    }
                }
            ],
            "platform": "Camera-ffmpeg"
        }

I can see the device in HomeKit, but I can't see the stream. in Homebridge I get the log with error:

Error in line 40 - 43

[10/24/2020, 7:19:59 PM] Homebridge is running on port 51073.
[10/24/2020, 7:19:59 PM] [Config] Homebridge Config UI X v4.30.0 is listening on :: port 8581
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] Video stream requested: 1920 x 1080, 30 fps, 802 kbps
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] Starting video stream: 1280 x 720, 30 fps, 802 kbps
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] Stream command: /usr/local/lib/node_modules/homebridge-camera-ffmpeg/node_modules/ffmpeg-for-homebridge/ffmpeg -f alsa -ac 1 -ar 44100 -thread_queue_size 2048 -i plughw:CARD=C525,DEV=0 -re -f video4linux2 -i /dev/video0 -vsync 0 -af aresample=async=1 -map 1 -codec:v libx264 -pix_fmt yuv420p -color_range mpeg -r 30 -f rawvideo -preset ultrafast -tune zerolatency -filter:v scale='min(1280,iw)':'min(720,ih)':force_original_aspect_ratio=decrease,scale=trunc(iw/2)*2:trunc(ih/2)*2 -b:v 802k -payload_type 99 -ssrc 8235796 -f rtp -srtp_out_suite AES_CM_128_HMAC_SHA1_80 -srtp_out_params +8FT021qbuVUVqUWPs6mAk3QoUsZLypnwWwn5eeL srtp://192.168.192.128:53241?rtcpport=53241&pkt_size=188 -map 0 -codec:a libfdk_aac -profile:a aac_eld -flags +global_header -f null -ar 16k -b:a 24k -ac 1 -payload_type 110 -ssrc 133161 -f rtp -srtp_out_suite AES_CM_128_HMAC_SHA1_80 -srtp_out_params 2TMzDPX7m1PoJIYovzniaiJTSg5AQiaunODCoT56 srtp://192.168.192.128:59013?rtcpport=59013&pkt_size=188 -loglevel level+verbose
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] [info] ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] [info]   built with Apple clang version 11.0.3 (clang-1103.0.32.62)
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] 
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] [info]   configuration: --enable-videotoolbox --pkgconfigdir=/Users/runner/work/ffmpeg-for-homebridge/ffmpeg-for-homebridge/build/workspace/lib/pkgconfig --prefix=/Users/runner/work/ffmpeg-for-homebridge/ffmpeg-for-homebridge/build/workspace --pkg-config-flags=--static --extra-cflags=-I/Users/runner/work/ffmpeg-for-homebridge/ffmpeg-for-homebridge/build/workspace/include --extra-ldflags=-L/Users/runner/work/ffmpeg-for-homebridge/ffmpeg-for-homebridge/build/workspace/lib --extra-libs='-lpthread -lm' --enable-static --disable-debug --disable-shared --disable-ffplay --disable-doc --enable-openssl --enable-gpl --enable-version3 --enable-nonfree --enable-pthreads --enable-libvpx --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libx264 --enable-runtime-cpudetect --enable-libfdk-aac --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-decoder=h264 --enable-network --enable-protocol=tcp --enable-libspeex --enable-demuxer=rtsp
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] 
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] [info]   libavutil      56. 51.100 / 56. 51.100
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] [info]   libavcodec     58. 91.100 / 58. 91.100
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] [info]   libavformat    58. 45.100 / 58. 45.100
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] [info]   libavdevice    58. 10.100 / 58. 10.100
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] [info]   libavfilter     7. 85.100 /  7. 85.100
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] [info]   libswscale      5.  7.100 /  5.  7.100
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] [info]   libswresample   3.  7.100 /  3.  7.100
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] [info]   libpostproc    55.  7.100 / 55.  7.100
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] 
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] [fatal] Unknown input format: 'alsa'
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] 
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] FFmpeg exited with code: 1 and signal: null (Error)
[10/24/2020, 7:41:02 PM] [Camera FFmpeg] [Logitech-C525] Stopped video stream.
[10/24/2020, 7:41:07 PM] [Camera FFmpeg] [Logitech-C525] Video stream requested: 1920 x 1080, 30 fps, 802 kbps
[10/24/2020, 7:41:07 PM] [Camera FFmpeg] [Logitech-C525] Starting video stream: 1280 x 720, 30 fps, 802 kbps
[10/24/2020, 7:41:07 PM] [Camera FFmpeg] [Logitech-C525] Stream command: /usr/local/lib/node_modules/homebridge-camera-ffmpeg/node_modules/ffmpeg-for-homebridge/ffmpeg -f alsa -ac 1 -ar 44100 -thread_queue_size 2048 -i plughw:CARD=C525,DEV=0 -re -f video4linux2 -i /dev/video0 -vsync 0 -af aresample=async=1 -map 1 -codec:v libx264 -pix_fmt yuv420p -color_range mpeg -r 30 -f rawvideo -preset ultrafast -tune zerolatency -filter:v scale='min(1280,iw)':'min(720,ih)':force_original_aspect_ratio=decrease,scale=trunc(iw/2)*2:trunc(ih/2)*2 -b:v 802k -payload_type 99 -ssrc 9061732 -f rtp -srtp_out_suite AES_CM_128_HMAC_SHA1_80 -srtp_out_params nq06StWnJvjHfEQiY9FNwuCPzQrpqgN/r+RpJR/K srtp://192.168.192.128:60221?rtcpport=60221&pkt_size=188 -map 0 -codec:a libfdk_aac -profile:a aac_eld -flags +global_header -f null -ar 16k -b:a 24k -ac 1 -payload_type 110 -ssrc 5827949 -f rtp -srtp_out_suite AES_CM_128_HMAC_SHA1_80 -srtp_out_params YgdtCtJOK59vjDHVS2goJ+eIv7eRD4pFaU2M3XwW srtp://192.168.192.128:61334?rtcpport=61334&pkt_size=188 -loglevel level+verbose
[10/24/2020, 7:41:07 PM] [Camera FFmpeg] [Logitech-C525] [info] 
[10/24/2020, 7:41:07 PM] [Camera FFmpeg] [Logitech-C525] ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
[10/24/2020, 7:41:07 PM] [Camera FFmpeg] [Logitech-C525] [info]   built with Apple clang version 11.0.3 (clang-1103.0.32.62)
[10/24/2020, 7:41:07 PM] [Camera FFmpeg] [Logitech-C525] [info]   configuration: --enable-videotoolbox --pkgconfigdir=/Users/runner/work/ffmpeg-for-homebridge/ffmpeg-for-homebridge/build/workspace/lib/pkgconfig --prefix=/Users/runner/work/ffmpeg-for-homebridge/ffmpeg-for-homebridge/build/workspace --pkg-config-flags=--static --extra-cflags=-I/Users/runner/work/ffmpeg-for-homebridge/ffmpeg-for-homebridge/build/workspace/include --extra-ldflags=-L/Users/runner/work/ffmpeg-for-homebridge/ffmpeg-for-homebridge/build/workspace/lib --extra-libs='-lpthread -lm' --enable-static --disable-debug --disable-shared --disable-ffplay --disable-doc --enable-openssl --enable-gpl --enable-version3 --enable-nonfree --enable-pthreads --enable-libvpx --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libx264 --enable-runtime-cpudetect --enable-libfdk-aac --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-decoder=h264 --enable-network --enable-protocol=tcp --enable-libspeex --enable-demuxer=rtsp

Can somebody help me?

LG

Urs