gistfile1.txt

ffmpeg -i basic_delay_shelf65hz_vrear6-2.wav -af loudnorm=print_format=summary -sample_fmt pcm_f32le test.wav
ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 8.3.0 (Rev2, Built by MSYS2 project)
  configuration: --prefix=/mingw64 --target-os=mingw32 --arch=x86_64 --disable-debug --disable-static --enable-dxva2 --enable-d3d11va --enable-fontconfig --enable-gnutls --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libcaca --enable-libcelt --enable-libfreetype --enable-libgsm --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libspeex --enable-libsrt --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libx265 --enable-libxvid --enable-libvpx --enable-libwebp --enable-openal --enable-libwavpack --enable-pic --enable-postproc --enable-runtime-cpudetect --enable-shared --enable-static --enable-swresample --enable-version3 --enable-zlib --disable-doc
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Guessed Channel Layout for Input Stream #0.0 : 6.1
Input #0, wav, from 'basic_delay_shelf65hz_vrear6-2.wav':
  Duration: 00:00:00.34, bitrate: 10753 kb/s
    Stream #0:0: Audio: pcm_f32le ([3][0][0][0] / 0x0003), 48000 Hz, 6.1, flt, 10752 kb/s
Invalid sample format 'pcm_f32le'