[FFmpeg-user] Reading Tempo/BPM information from audio files

[Adam Harries]

> Instead of the metadata file please provide ffmpeg -i output,
I find it easier to read.

I've attached two new ffmpeg results, formatted using ffmpeg -i.

> Please do not top-post here

I'm afraid that I'm not familiar with top-posting, or whether I'm doing it
or not. Sorry! I've only just subscribed...

Thanks,
Adam
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ffmpeg version 3.4.2-2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu2)
  configuration: --prefix=/usr --extra-version=2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, ffmetadata, from 'ffmpeg_m4a_metadata.txt':
  Metadata:
    major_brand     : M4A 
    minor_version   : 0
    compatible_brands: M4A mp42isom
    account_id      : harries.adam at gmail.com
    iTunSMPB        :  00000000 00000840 00000250 000000000068F970 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
    iTunNORM        :  0000022F 00000236 0000215E 000031B2 00015CD8 00015CD8 000062DD 0000552D 0001E2D0 0001C4CA
    title           : Airmail Special
    artist          : Michael Gamble & The Rhythm Serenaders
    album_artist    : Michael Gamble
    album           : Michael Gamble & the Rhythm Serenaders
    comment         :  [ed#{"algs"#{"ffmpeg-naive"#249}}#de]
    genre           : Jazz
    date            : 2016-08-12T07:00:00Z
    track           : 19/23
    compilation     : 0
    copyright       : ℗ 2016 Organic Records
    purchase_date   : 2017-10-14 16:31:54
    media_type      : 1
    rating          : 0
    gapless_playback: 0
    encoder         : Lavf57.83.100
  Duration: N/A, start: 0.000000, bitrate: N/A
At least one output file must be specified
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ffmpeg version 3.4.2-2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu2)
  configuration: --prefix=/usr --extra-version=2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, ffmetadata, from 'ffmpeg_mp3_metadata.txt':
  Metadata:
    album           : Jumpin' at the Woodside
    title           : Jumpin' at the Woodside
    TLEN            : 196.48
    artist          : Count Basie And His Orchestra;Count Basie
    track           : 01
    comment         :  [ed#{"algs"#{"ffmpeg-naive"#240}}#de]
    TBPM            : 2
    encoder         : Lavf57.83.100
  Duration: N/A, start: 0.000000, bitrate: N/A
At least one output file must be specified