fmpeg -y -hide_banner -nostats -thread_queue_size 1024 -i /tmp/inpipe -osr 48000 -c:a libtwolame -b:a 160k -minrate 160k -maxrate 160k -bufsize 160k -mode stereo -mpegts_transport_stream_id 1 -mpegts_original_network_id 1 -mpegts_service_id 1 -mpegts_service_type digital_radio -pcr_period 20 -metadata service_name="-" -metadata service_provider="-" -mpegts_start_pid 769 -mpegts_pmt_start_pid 257 -muxrate 256k -mpegts_flags 'system_b' -mpegts_flags 'nit' -f mpegts pipe:1 | cat > /dev/spidev4.0
Launch Arecord
Detaching from process 1153
Detaching from process 1154
Recording WAVE 'stdin' : Signed 32 bit Little Endian, Rate 48000 Hz, Stereo
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from '/tmp/inpipe':
  Duration: N/A, bitrate: 3072 kb/s
  Stream #0:0: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s32, 3072 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s32le (native) -> mp2 (libtwolame))
Press [q] to stop, [?] for help
Output #0, mpegts, to 'pipe:1':
  Metadata:
    service_name    : -
    service_provider: -
    encoder         : Lavf59.16.100
  Stream #0:0: Audio: mp2, 48000 Hz, stereo, flt, 160 kb/s
    Metadata:
      encoder         : Lavc59.18.100 libtwolame
size=  174763kB time=01:33:12.39 bitrate= 256.0kbits/s speed=   1x
video:0kB audio:109227kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 59.999962%