New submission from Michael <zenithanimati...@gmail.com>:

ffmpeg -v 9 -loglevel 99 -i together.wma -ab 320k -map_meta_data 
together.m4a:together.wma together.m4a
FFmpeg version SVN-r23926, Copyright (c) 2000-2010 the FFmpeg developers
  built on Jul  1 2010 04:29:33 with gcc 4.4.2
  configuration: --enable-gpl --enable-version3 --enable-libgsm --
enable-pthread
s --enable-libvorbis --enable-libtheora --enable-libspeex --enable-
libmp3lame --
enable-libopenjpeg --enable-libschroedinger --enable-libopencore_amrwb -
-enable-
libopencore_amrnb --enable-libvpx --arch=x86 --enable-runtime-cpudetect 
--enable
-libxvid --enable-libx264 --extra-libs='-lx264 -lpthread' --enable-
librtmp --ext
ra-libs='-lrtmp -lpolarssl -lws2_32 -lwinmm' --target-os=mingw32 --
enable-avisyn
th --cross-prefix=i686-mingw32- --cc='ccache i686-mingw32-gcc' --enable-
memalign
-hack
  libavutil     50.19. 0 / 50.19. 0
  libavcodec    52.78. 0 / 52.78. 0
  libavformat   52.71. 0 / 52.71. 0
  libavdevice   52. 2. 0 / 52. 2. 0
  libavfilter    1.20. 1 /  1.20. 1
  libswscale     0.11. 0 /  0.11. 0
[NULL @ 0188bf90] Probed with size=2048 and score=100
[asf @ 0188bf90] Unsupported value type 1 in tag WM/MCDI.
[asf @ 0188bf90] gpos mismatch our pos=24, end=26
[asf @ 0188bf90] gpos mismatch our pos=24, end=34
[asf @ 0188bf90] gpos mismatch our pos=24, end=374
[asf @ 0188bf90] gpos mismatch our pos=24, end=3121
[asf @ 0188bf90] gpos mismatch our pos=24, end=174
[asf @ 0188bf90] All info found
Input #0, asf, from 'together.wma':
  Metadata:
    title           : Come Together
    author          : The Beatles
    copyright       :
    comment         :
    WM/Genre        : Rock
    WM/AlbumTitle   : Abbey Road
    WM/Track        : 0
    WM/TrackNumber  : 1
    WM/Year         : 1969
    WM/Composer     : John Lennon; Paul McCartney
    WM/AlbumArtist  : The Beatles
    WM/Lyrics       :
    WM/MediaPrimaryClassID: {D1607DBC-E323-4BE2-86A1-48A42A28441E}
    WMFSDKVersion   : 12.0.7600.16385
    WMFSDKNeeded    : 0.0.0.0000
    PeakValue       : 313
    AverageLevel    : 601
    WM/EncodingTime : 6361699
    WM/Provider     : AMG
    WM/Publisher    : Toshiba EMI
    WM/UniqueFileIdentifier: AMGa_id=R     1525;AMGp_id=P     
3644;AMGt_id=T   7
20900
    WM/ProviderRating: 8
    WM/ProviderStyle: Pop/Rock
    IsVBR           : 0
    MediaFoundationVersion: 2.112
  Duration: 00:04:19.96, start: 1.579000, bitrate: 128 kb/s
    Stream #0.0, 1, 1/1000: Audio: wmav2, 44100 Hz, 2 channels, s16, 128 
kb/s
File 'together.m4a' already exists. Overwrite ? [y/N] y
Output #0, ipod, to 'together.m4a':
  Metadata:
    title           : Come Together
    artist          : The Beatles
    copyright       :
    comment         :
    genre           : Rock
    album           : Abbey Road
    track           : 1
    WM/Year         : 1969
    composer        : John Lennon; Paul McCartney
    album_artist    : The Beatles
    WM/Lyrics       :
    WM/MediaPrimaryClassID: {D1607DBC-E323-4BE2-86A1-48A42A28441E}
    WMFSDKVersion   : 12.0.7600.16385
    WMFSDKNeeded    : 0.0.0.0000
    PeakValue       : 313
    AverageLevel    : 601
    WM/EncodingTime : 6361699
    WM/Provider     : AMG
    publisher       : Toshiba EMI
    WM/UniqueFileIdentifier: AMGa_id=R     1525;AMGp_id=P     
3644;AMGt_id=T   7
20900
    WM/ProviderRating: 8
    WM/ProviderStyle: Pop/Rock
    IsVBR           : 0
    MediaFoundationVersion: 2.112
    encoder         : Lavf52.71.0
    Stream #0.0, 0, 1/44100: Audio: aac, 44100 Hz, 2 channels, s16, 320 
kb/s
Stream mapping:
  Stream #0.0 -> #0.0
Press [q] to stop encoding
size=    9401kB time=260.02 bitrate= 296.2kbits/s
video:0kB audio:9313kB global headers:0kB muxing overhead 0.949192%


The output m4a files have easily noticeable audio artifacts that seem to 
be coming exclusively from the left ear (channel). A sample of the 
original and coverted file is attached.
File 'together.m4a' not attached - you can download it from 
https://roundup.ffmpeg.org/file964.

----------
files: together.m4a
messages: 11057
priority: normal
status: new
substatus: new
title: Creating m4a (aac) file produces artifacts in output
topic: ffmpeg
type: bug

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FFmpeg issue tracker <iss...@roundup.ffmpeg.org>
<https://roundup.ffmpeg.org/issue2065>
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