ffmpeg -y -v verbose -hide_banner -nostats -i /tmp/inpipe -f pcm_s32le -ar 48000 -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 2352
Detaching from process 2353
Routing option mode to both codec and muxer layer
Recording WAVE 'stdin' : Signed 32 bit Little Endian, Rate 48000 Hz, Stereo
[wav @ 0x55555a4ea0] parser not found for codec pcm_s32le, packets or times may be invalid.
    Last message repeated 1 times
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
[graph_0_in_0_0 @ 0x55555e0c00] tb:1/48000 samplefmt:s32 samplerate:48000 chlayout:0x3
[format_out_0_0 @ 0x55555defa0] auto-inserting filter 'auto_aresample_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_0'
[auto_aresample_0 @ 0x55555b8ba0] ch:2 chl:stereo fmt:s32 r:48000Hz -> ch:2 chl:stereo fmt:flt r:48000Hz
[mpegts @ 0x55555abb00] service 1 using PCR in pid=769, pcr_period=20ms
[mpegts @ 0x55555abb00] muxrate 256000, sdt every 500 ms, pat/pmt every 100 ms, nit every 500 ms
Output #0, mpegts, to 'pipe:1':
  Metadata:
    service_name    : -
    service_provider: -
    encoder         : Lavf59.16.100
  Stream #0:0: Audio: mp2, 48000 Hz, stereo, flt, delay 481, 160 kb/s
    Metadata:
      encoder         : Lavc59.18.100 libtwolame
No more output streams to write to, finishing.
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%
Input file #0 (/tmp/inpipe):
  Input stream #0:0 (audio): 524288 packets read (2147483648 bytes); 524288 frames decoded (268435456 samples);
  Total: 524288 packets (2147483648 bytes) demuxed
Output file #0 (pipe:1):
  Output stream #0:0 (audio): 233017 frames encoded (268435456 samples); 233017 packets muxed (111848160 bytes);
  Total: 233017 packets (111848160 bytes) muxed
[AVIOContext @ 0x55555e0d70] Statistics: 178957012 bytes written, 0 seeks, 38837 writeouts
[AVIOContext @ 0x55555b53e0] Statistics: 2147483692 bytes read, 0 seeks