macos – iPhone 14 just isn’t taking part in this audio, used ffmpeg to extend quantity in audio

I recorded an audio utilizing Audacity, then elevated its quantity 10 occasions utilizing ffmpeg. When I’m sending this audio as attachment to my pals to check, then folks with older iPhones are capable of hear it high quality (quantity remains to be low although), however folks on iPhone 14 and better should not listening to my voice within the mp3 in any respect.

Really, on iPhone 14 and better, my voice is there in audio, however its so low in quantity that it is nearly inaudible, unattainable to listen to. I can hear it if I pressure actually actually so much. Different issues on the telephone are taking part in high quality, audio settings are displaying full.

If I add a background music to the audio utilizing ffmpeg, then folks on iPhone 14 and better are solely listening to the music, not my voice.
What is going on right here?

Edit: That is definitely a ffmpeg difficulty. I elevated quantity in enter file utilizing audacity and tried taking part in the brand new file on iPhone 14, it has considerably larger quantity, can hear myself somewhat however nonetheless not a lot. In any case, no matter Audacity did to extend quantity, that labored, and no matter ffmpeg is doing with my beneath command, it is not working in any respect.

My query is: Do I want to regulate some frequency and so on choices/settings within the enter when utilizing ffmpeg to extend the quantity? What ffmpeg command can I take advantage of to repair the problem, in order that quantity elevated recordsdata play on all gadgets?
Thanks

Right here is the ffmpeg command I’m utilizing to extend quantity in my recorded audio. Output mp3 file from beneath command is uploaded right here:
https://tbrjar.com/audio_test/z1.mp3

and this is the unique enter file as recorded by audacity:
https://tbrjar.com/audio_test/enter.mp3

% ffmpeg -ss 00:00:00 -i enter.mp3 -to 00:00:05 -filter:a "quantity=10" -c:a libmp3lame z1.mp3
    
ffmpeg model 2024-03-04-git-e30369bc1c-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg builders
      constructed with gcc 13.2.0 (Rev5, Constructed by MSYS2 undertaking)
      configuration: --enable-gpl --enable-version3 --enable-static --pkg-config=pkg
    conf --disable-w32threads --disable-autodetect --enable-fontconfig --enable-icon
    v --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --e
    nable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh -
    -enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sd
    l2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdav
    s2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --en
    able-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvi
    d --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-
    mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-li
    bfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-l
    ibvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-
    ffnvcodec --enable-nvdec --enable-nvenc --enable-dxva2 --enable-d3d11va --enable
    -libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl
    --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enabl
    e-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --e
    nable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --e
    nable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --ena
    ble-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmys
    ofa --enable-librubberband --enable-libsoxr --enable-chromaprint
      libavutil      58. 40.100 / 58. 40.100
      libavcodec     60. 41.100 / 60. 41.100
      libavformat    60. 23.100 / 60. 23.100
      libavdevice    60.  4.100 / 60.  4.100
      libavfilter     9. 17.100 /  9. 17.100
      libswscale      7.  6.100 /  7.  6.100
      libswresample   4. 14.100 /  4. 14.100
      libpostproc    57.  4.100 / 57.  4.100
    Enter #0, mp3, from 'luck1.mp3':
      Length: 00:00:54.02, begin: 0.025057, bitrate: 133 kb/s
      Stream #0:0: Audio: mp3 (mp3float), 44100 Hz, stereo, fltp, 133 kb/s
          Metadata:
            encoder         : LAME3.100
    Stream mapping:
      Stream #0:0 -> #0:0 (mp3 (mp3float) -> mp3 (libmp3lame))
    Press [q] to cease, [?] for assist
    Output #0, mp3, to 'z1.mp3':
      Metadata:
        TSSE            : Lavf60.23.100
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp
          Metadata:
            encoder         : Lavc60.41.100 libmp3lame
    [out#0/mp3 @ 00000000001a7340] video:0KiB audio:79KiB subtitle:0KiB different stream
    s:0KiB international headers:0KiB muxing overhead: 0.313639%
    dimension=      79KiB time=00:00:05.00 bitrate= 129.5kbits/s pace=18.2x