Windows 10 ffmpeg

C:\ffmpeg\bin>ffmpeg -loglevel verbose -i input.mp3 -vn -c:a aac -b:a 160k -ac 2 -ar 44100 output.mp4
ffmpeg version N-89674-g57d0c24132 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7.2.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-amf --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  libavutil      56.  7.100 / 56.  7.100
  libavcodec     58.  9.100 / 58.  9.100
  libavformat    58.  3.100 / 58.  3.100
  libavdevice    58.  0.100 / 58.  0.100
  libavfilter     7.  8.100 /  7.  8.100
  libswscale      5.  0.101 /  5.  0.101
  libswresample   3.  0.101 /  3.  0.101
  libpostproc    55.  0.100 / 55.  0.100
[mp3 @ 000002c705a39500] Skipping 0 bytes of junk at 5967.
Input #0, mp3, from 'input.mp3':
  Metadata:
    title           : We're Invincible
    artist          : C├ÿDE feat. Joseph Feinstein
    album           : [non-album tracks]
    encoder         : Lavf58.7.100
    major_brand     : isom
    minor_version   : 512
    artist-sort     : C├ÿDE feat. Joseph Feinstein
    Artists         : C├ÿDE/Joseph Feinstein
    compatible_brands: isomiso2avc1mp41
    Acoustid Id     : 051145ac-3491-40b3-ad82-d5ff214573a5
    MusicBrainz Artist Id: 5da06669-d475-4d98-a5a0-a9f003a24ff7/1553e529-a391-4634-a97e-23c0961a2048
  Duration: 00:03:24.09, start: 0.025057, bitrate: 148 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 148 kb/s
    Metadata:
      encoder         : Lavc58.9.
File 'output.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (mp3 (native) -> aac (native))
Press [q] to stop, [?] for help
[graph_0_in_0_0 @ 000002c705aed940] tb:1/44100 samplefmt:s16p samplerate:44100 chlayout:0x3
[format_out_0_0 @ 000002c705aee480] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_0'
[auto_resampler_0 @ 000002c705aede00] ch:2 chl:stereo fmt:s16p r:44100Hz -> ch:2 chl:stereo fmt:fltp r:44100Hz
Output #0, mp4, to 'output.mp4':
  Metadata:
    title           : We're Invincible
    artist          : C├ÿDE feat. Joseph Feinstein
    album           : [non-album tracks]
    MusicBrainz Artist Id: 5da06669-d475-4d98-a5a0-a9f003a24ff7/1553e529-a391-4634-a97e-23c0961a2048
    major_brand     : isom
    minor_version   : 512
    artist-sort     : C├ÿDE feat. Joseph Feinstein
    Artists         : C├ÿDE/Joseph Feinstein
    compatible_brands: isomiso2avc1mp41
    Acoustid Id     : 051145ac-3491-40b3-ad82-d5ff214573a5
    encoder         : Lavf58.3.100
    Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, delay 1024, 160 kb/s
    Metadata:
      encoder         : Lavc58.9.100 aac
No more output streams to write to, finishing.7kbits/s speed=37.7x
size=    4062kB time=00:03:24.05 bitrate= 163.1kbits/s speed=37.7x
video:0kB audio:4027kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.876344%
Input file #0 (input.mp3):
  Input stream #0:0 (audio): 7813 packets read (3790642 bytes); 7813 frames decoded (8998912 samples);
  Total: 7813 packets (3790642 bytes) demuxed
Output file #0 (output.mp4):
  Output stream #0:0 (audio): 8788 frames encoded (8998912 samples); 8789 packets muxed (4123497 bytes);
  Total: 8789 packets (4123497 bytes) muxed
[aac @ 000002c705a3cbc0] Qavg: 574.583