When AIFF to WAV, ReplayGain is not extracted as Side data.
ReplayGain is correctly extracted as Side data when Flac to WAV or Apple
Lossless (m4a) to WAV.

    Side data:
      replaygain: track gain - -10.880000, track peak - 0.000023, album
gain - -10.880000, album peak - 0.000023,



How can I extract ReplayGain as Side data when using AIFF to WAV?

AIFF, Flac, Apple Lossless (m4a), I attach the logs when converted each to
WAV.
$ ffmpeg -i 01\ Hello.aiff aiff_output.wav
ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.1 --enable-shared 
--enable-pthreads --enable-version3 --enable-hardcoded-tables 
--enable-avresample --cc=clang 
--host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include
 
-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include/darwin'
 --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom 
--enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband 
--enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis 
--enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid 
--enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r 
--enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb 
--enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox 
--disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  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
  libavresample   4.  0.  0 /  4.  0.  0
  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 : stereo
Input #0, aiff, from '01 Hello.aiff':
  Metadata:
    REPLAYGAIN_TRACK_GAIN: -10.88 dB
    REPLAYGAIN_TRACK_PEAK: 0.998840
    Dynamic Range (R128): 17.064826
    Dynamic Range (DR): 5
    REPLAYGAIN_ALBUM_GAIN: -10.88 dB
    REPLAYGAIN_ALBUM_PEAK: 0.998840
    Album Dynamic Range (R128): 17.097127
    Album Dynamic Range (DR): 5
    TOTALTRACKS     : 14
    ALBUMARTIST     : Adele
    TOTALDISCS      : 1
    TSO2            : Adele
    comment         : 
C70E1D0E+271166+14+150+22312+39043+65190+87008+105415+123447+140354+161800+178830+199215+218092+232969+253249
    composer        : Greg Kurstin
    album           : 25
    title           : Hello_AIFF
    artist          : Adele
    genre           : Pop
    date            : 2015
    track           : 1/14
    album_artist    : Adele
    disc            : 1/1
    album-sort      : 25
  Duration: 00:04:55.49, start: 0.000000, bitrate: 1416 kb/s
    Stream #0:0: Audio: pcm_s16be, 44100 Hz, stereo, s16, 1411 kb/s
    Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1240x1240 
[SAR 1:1 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
    Metadata:
      comment         : Cover (front)
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16be (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, wav, to 'aiff_output.wav':
  Metadata:
    REPLAYGAIN_TRACK_GAIN: -10.88 dB
    REPLAYGAIN_TRACK_PEAK: 0.998840
    Dynamic Range (R128): 17.064826
    Dynamic Range (DR): 5
    REPLAYGAIN_ALBUM_GAIN: -10.88 dB
    REPLAYGAIN_ALBUM_PEAK: 0.998840
    Album Dynamic Range (R128): 17.097127
    Album Dynamic Range (DR): 5
    TOTALTRACKS     : 14
    ALBUMARTIST     : Adele
    TOTALDISCS      : 1
    TSO2            : Adele
    ICMT            : 
C70E1D0E+271166+14+150+22312+39043+65190+87008+105415+123447+140354+161800+178830+199215+218092+232969+253249
    composer        : Greg Kurstin
    IPRD            : 25
    INAM            : Hello_AIFF
    IART            : Adele
    IGNR            : Pop
    ICRD            : 2015
    IPRT            : 1/14
    album_artist    : Adele
    disc            : 1/1
    album-sort      : 25
    ISFT            : Lavf58.20.100
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, 
s16, 1411 kb/s
    Metadata:
      encoder         : Lavc58.35.100 pcm_s16le
size=   50904kB time=00:04:55.49 bitrate=1411.2kbits/s speed= 542x    
video:0kB audio:50903kB subtitle:0kB other streams:0kB global headers:0kB 
muxing overhead: 0.000541%

$ ffmpeg -i 01\ Hello.flac flac_output.wav
ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.1 --enable-shared 
--enable-pthreads --enable-version3 --enable-hardcoded-tables 
--enable-avresample --cc=clang 
--host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include
 
-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include/darwin'
 --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom 
--enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband 
--enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis 
--enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid 
--enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r 
--enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb 
--enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox 
--disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  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
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, flac, from '01 Hello.flac':
  Metadata:
    ALBUM           : 25
    ALBUM DYNAMIC RANGE (DR): 5
    ALBUM DYNAMIC RANGE (R128): 17.097127
    album_artist    : Adele
    ALBUMARTISTSORT : Adele
    ALBUMSORT       : 25
    ARTIST          : Adele
    COMPOSER        : Greg Kurstin
    DATE            : 2015
    disc            : 1
    DISCTOTAL       : 1
    DYNAMIC RANGE (DR): 5
    DYNAMIC RANGE (R128): 17.064826
    ENCODER         : X Lossless Decoder 20181001
    GENRE           : Pop
    ITUNES_CDDB_1   : 
C70E1D0E+271166+14+150+22312+39043+65190+87008+105415+123447+140354+161800+178830+199215+218092+232969+253249
    REPLAYGAIN_ALBUM_GAIN: -10.88 dB
    REPLAYGAIN_ALBUM_PEAK: 0.998840
    REPLAYGAIN_TRACK_GAIN: -10.88 dB
    REPLAYGAIN_TRACK_PEAK: 0.998840
    TITLE           : Hello_FLAC
    track           : 1
    TRACKTOTAL      : 14
  Duration: 00:04:55.49, start: 0.000000, bitrate: 799 kb/s
    Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
    Side data:
      replaygain: track gain - -10.880000, track peak - 0.000023, album gain - 
-10.880000, album peak - 0.000023, 
    Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1240x1240 
[SAR 1:1 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
    Metadata:
      comment         : Cover (front)
Stream mapping:
  Stream #0:0 -> #0:0 (flac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, wav, to 'flac_output.wav':
  Metadata:
    IPRD            : 25
    ALBUM DYNAMIC RANGE (DR): 5
    ALBUM DYNAMIC RANGE (R128): 17.097127
    album_artist    : Adele
    ALBUMARTISTSORT : Adele
    ALBUMSORT       : 25
    IART            : Adele
    COMPOSER        : Greg Kurstin
    ICRD            : 2015
    disc            : 1
    DISCTOTAL       : 1
    DYNAMIC RANGE (DR): 5
    DYNAMIC RANGE (R128): 17.064826
    TRACKTOTAL      : 14
    IGNR            : Pop
    ITUNES_CDDB_1   : 
C70E1D0E+271166+14+150+22312+39043+65190+87008+105415+123447+140354+161800+178830+199215+218092+232969+253249
    REPLAYGAIN_ALBUM_GAIN: -10.88 dB
    REPLAYGAIN_ALBUM_PEAK: 0.998840
    REPLAYGAIN_TRACK_GAIN: -10.88 dB
    REPLAYGAIN_TRACK_PEAK: 0.998840
    INAM            : Hello_FLAC
    IPRT            : 1
    ISFT            : Lavf58.20.100
    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, 
s16, 1411 kb/s
    Metadata:
      encoder         : Lavc58.35.100 pcm_s16le
    Side data:
      replaygain: track gain - -10.880000, track peak - 0.000023, album gain - 
-10.880000, album peak - 0.000023, 
size=   50904kB time=00:04:55.49 bitrate=1411.2kbits/s speed= 647x    
video:0kB audio:50903kB subtitle:0kB other streams:0kB global headers:0kB 
muxing overhead: 0.000307%

$ ffmpeg -i 01\ Hello.m4a m4a_output.wav
ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.1 --enable-shared 
--enable-pthreads --enable-version3 --enable-hardcoded-tables 
--enable-avresample --cc=clang 
--host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include
 
-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include/darwin'
 --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom 
--enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband 
--enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis 
--enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid 
--enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r 
--enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb 
--enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox 
--disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  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
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd932800000] stream 0, timescale not set
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '01 Hello.m4a':
  Metadata:
    major_brand     : M4A 
    minor_version   : 0
    compatible_brands: M4A mp42isom
    creation_time   : 1974-08-18T10:22:12.000000Z
    Album Dynamic Range (DR): 5
    Album Dynamic Range (R128): 17.097127
    Dynamic Range (DR): 5
    Dynamic Range (R128): 17.064826
    replaygain_album_gain: -10.88 dB
    replaygain_album_peak: 0.998840
    replaygain_track_gain: -10.88 dB
    replaygain_track_peak: 0.998840
    soaa            : Adele
    soal            : 25
    album_artist    : Adele
    disc            : 1/1
    sort_album_artist: Adele
    sort_album      : 25
    track           : 1/14
    artist          : Adele
    album           : 25
    comment         : 
    date            : 2015
    genre           : Pop
    title           : Hello_ALAC
    encoder         : X Lossless Decoder 20161007, QuickTime 7.7.3
    composer        : Greg Kurstin
  Duration: 00:04:55.49, start: 0.000000, bitrate: 813 kb/s
    Stream #0:0(eng): Audio: alac (alac / 0x63616C61), 44100 Hz, stereo, s16p, 
807 kb/s (default)
    Metadata:
      creation_time   : 1974-08-18T10:22:12.000000Z
    Side data:
      replaygain: track gain - -10.880000, track peak - 0.000023, album gain - 
-10.880000, album peak - 0.000023, 
    Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1240x1240 
[SAR 1:1 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (alac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, wav, to 'm4a_output.wav':
  Metadata:
    major_brand     : M4A 
    minor_version   : 0
    compatible_brands: M4A mp42isom
    composer        : Greg Kurstin
    Album Dynamic Range (DR): 5
    Album Dynamic Range (R128): 17.097127
    Dynamic Range (DR): 5
    Dynamic Range (R128): 17.064826
    replaygain_album_gain: -10.88 dB
    replaygain_album_peak: 0.998840
    replaygain_track_gain: -10.88 dB
    replaygain_track_peak: 0.998840
    soaa            : Adele
    soal            : 25
    album_artist    : Adele
    disc            : 1/1
    sort_album_artist: Adele
    sort_album      : 25
    IPRT            : 1/14
    IART            : Adele
    IPRD            : 25
    ICMT            : 
    ICRD            : 2015
    IGNR            : Pop
    INAM            : Hello_ALAC
    ISFT            : Lavf58.20.100
    Stream #0:0(eng): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 
stereo, s16, 1411 kb/s (default)
    Metadata:
      creation_time   : 1974-08-18T10:22:12.000000Z
      encoder         : Lavc58.35.100 pcm_s16le
    Side data:
      replaygain: track gain - -10.880000, track peak - 0.000023, album gain - 
-10.880000, album peak - 0.000023, 
size=   50904kB time=00:04:55.49 bitrate=1411.2kbits/s speed= 255x    
video:0kB audio:50903kB subtitle:0kB other streams:0kB global headers:0kB 
muxing overhead: 0.000315%

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