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If you want to replace the audio after you export the music video… Video software (using the Premire) to re-export troublesome, I finally found to examine the ffmpeg!

FFmpeg-I *. MP4-I *. wav-c:v copy-c:a AAC-Strict experimental-map 0: v-map 1: a Output.mp4

The video is copied and the audio is AAC encoded, and the processing ends soon!

I was allowed to reference

Guide to video editing with FFmpeg-Moriyoshi Diary

Supplement

Until we reach the top way…

Separate and join

Extract only the video from the original video and then combine another voice… .

Ffmpe-I Track40.mp4-an-vcodec copy Mov.mp4
FFmpeg-I mov.mp4-I Track41.wav test.mp4

It takes time that the video is encoded by this method of joining.
I tried to find a way to combine it with copy, so I got an error.

Error 1

-Vcodec copy-acodec copy

FFmpeg-I Mov.mp4-vcodec copy-i Track40.wav-acodec copy Test2.mp4

Error

FFmpeg version git-2014-08-29-be3d807 Copyright (c) 2000-2014 the FFmpeg developers
  Built on Aug 29 2014 20:10:37 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4 svn)
  Configuration:--prefix =/users/username--Libdir =/users/username/lib--Incdir =/users/username/include-- ENABLE-LIBFAAC--enable-libx264--enable-libxvid--enable-nonfree--ENABLE-GPL--enable-libmp3lame--Enable-pthreads --ENABLE-LIBVPX--enable-libvorbis--disable-mmx--enable-shared--Enable-libtheora--pkg-config-pkg-config-- Enable-version3--enable-pic--extra-cflags =-I/users/username/include--extra-ldflags =-L/Users/username/lib
  Libavutil 54.  7.100/54.  7.100
  Libavcodec 56.  1.100/56.  1.100
  Libavformat 56.  3.100/56.  3.100
  Libavdevice 56.  0.100/56.  0.100
  Libavfilter 5.  0.103/5.  0.103
  Libswscale 3.  0.100/3.  0.100
  Libswresample one.  1.100/1.  1.100
  Libpostproc 53.  0.100/53.  0.100
Input #0, MOV, MP4, M4A, 3GP, 3g2, mj2, from ' Track42.mp4 ':
  Metadata
    Major_brand: mp42
    Minor_version: 0
    Compatible_brands: mp42mp41
    Creation_time: 2018-12-12 18:36:52
  Duration: 00:04:42.77, Start: 0.000000, bitrate: 16329 kb/s
    Stream #0:0 (Eng): Video: H264 (High) (AVC1/0x31637661), yuv420p (TV, bt709), 1280x720[SAR 1:1 DAR 16:9], 16009 kb/s, 29.97 fps, 29.97 TBR, 30k TBN, 59.94 TBC (default)
    Metadata
      Creation_time: 2018-12-12 18:36:52
      Handler_name: Alias Data Handler
      Encoder: AVC Coding
    Stream #0:1 (Eng): Audio: AAC (MP4A/0x6134706d), 44100 Hz, stereo, FLTP, 317 kb/s (default)
    Metadata
      Creation_time: 2018-12-12 18:36:52
      Handler_name: Alias Data Handler
Unknown decoder ' copy '

Error 2

Another way of examining

FFmpeg-I Track42.mp4-i Track42.wav-c:v copy-c:a AAC-map 0: v:0-map 1: a:0 output2.mp4

A little different error

FFmpeg version git-2014-08-29-be3d807 Copyright (c) 2000-2014 the FFmpeg developers
  Built on Aug 29 2014 20:10:37 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4 svn)
  Configuration:--prefix =/users/username--Libdir =/users/username/lib--Incdir =/users/username/include-- ENABLE-LIBFAAC--enable-libx264--enable-libxvid--enable-nonfree--ENABLE-GPL--enable-libmp3lame--Enable-pthreads --ENABLE-LIBVPX--enable-libvorbis--disable-mmx--enable-shared--Enable-libtheora--pkg-config-pkg-config-- Enable-version3--enable-pic--extra-cflags =-I/users/username/include--extra-ldflags =-L/Users/username/lib
  Libavutil 54.  7.100/54.  7.100
  Libavcodec 56.  1.100/56.  1.100
  Libavformat 56.  3.100/56.  3.100
  Libavdevice 56.  0.100/56.  0.100
  Libavfilter 5.  0.103/5.  0.103
  Libswscale 3.  0.100/3.  0.100
  Libswresample one.  1.100/1.  1.100
  Libpostproc 53.  0.100/53.  0.100
Input #0, MOV, MP4, M4A, 3GP, 3g2, mj2, from ' Track42.mp4 ':
  Metadata
    Major_brand: mp42
    Minor_version: 0
    Compatible_brands: mp42mp41
    Creation_time: 2018-12-12 18:36:52
  Duration: 00:04:42.77, Start: 0.000000, bitrate: 16329 kb/s
    Stream #0:0 (Eng): Video: H264 (High) (AVC1/0x31637661), yuv420p (TV, bt709), 1280x720[SAR 1:1 DAR 16:9], 16009 kb/s, 29.97 fps, 29.97 TBR, 30k TBN, 59.94 TBC (default)
    Metadata
      Creation_time: 2018-12-12 18:36:52
      Handler_name: Alias Data Handler
      Encoder: AVC Coding
    Stream #0:1 (Eng): Audio: AAC (MP4A/0x6134706d), 44100 Hz, stereo, FLTP, 317 kb/s (default)
    Metadata
      Creation_time: 2018-12-12 18:36:52
      Handler_name: Alias Data Handler
Guessed Channel Layout for Input Stream #1 .0: Stereo
Input #1, WAV, from ' Track42.wav ':
  Duration: 00:04:44.38, bitrate: 1411 kb/s
    Stream #1:0: Audio: Pcm_s16le [1][0][0][0](/0x0001), 44100 Hz, 2 channels, S16, 1411 kb/s
File ' Output2.mp4 ' already exists. Overwrite?[y/N] Y
[aac @ 0x7fe28985da00] The encoder ' AAC ' is experimental but experimental codecs are not enabled, add '-strict-2 ' If you want to use it.
[aac @ 0x7fe28985da00] Alternatively use the non experimental encoder ' LIBFAAC '.