$ ffprobe ./CxxxLog10toRec709_Legal.cube

ffprobe version N-94251-gf83b46e218 Copyright (c) 2007-2019 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  configuration: --prefix=/usr/local --enable-gpl --enable-nonfree --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libopus --enable-opencl --enable-libbluray --enable-libcaca --enable-libflite --enable-libfontconfig --enable-libfribidi --enable-libwebp --enable-version3
  libavutil      56. 30.100 / 56. 30.100
  libavcodec     58. 53.101 / 58. 53.101
  libavformat    58. 28.101 / 58. 28.101
  libavdevice    58.  7.100 / 58.  7.100
  libavfilter     7. 56.101 /  7. 56.101
  libswscale      5.  4.101 /  5.  4.101
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
[amrnb @ 0x7fff13803000] Estimating duration from bitrate, this may be inaccurate
Input #0, amrnb, from './CxxxLog10toRec709_Legal.cube':
  Duration: 00:11:20.63, bitrate: 10 kb/s
    Stream #0:0: Audio: amr_nb, 8000 Hz, mono, flt