Muxing AAC Creates Empty mov_text Stream

[Ryan Lucia]

FFmpeg version: N-79585-g268b5ae

Summary of the bug:

When remuxing the audio file, it creates an empty mov_text stream that wasn't present in the original file. The issue persists when muxed into an mp4 file, and I've tried nothing else.

How to reproduce:

Mux the audio file (​https://www.datafilehost.com/d/f857df5c) back into a new m4a file or mp4 file. Below is my sample, remuxing to m4a. Not sure if it's useful, but that audio file was generated by re-encoding a flac file I had handy using foobar2000's free encoder pack.

ffmpeg -i .\testaudio.m4a -map 0:a -codec copy testout.m4a

ffmpeg version N-79585-g268b5ae Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfi
g --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmfx --enable-libmp3l
ame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enabl
e-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-
libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx
264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  libavutil      55. 22.101 / 55. 22.101
  libavcodec     57. 38.100 / 57. 38.100
  libavformat    57. 34.103 / 57. 34.103
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 44.100 /  6. 44.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\testaudio.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 0
    compatible_brands: M4A mp42isom
    creation_time   : 2016-04-22 19:58:30
    track           : 1/3
    genre           : Vocal
    album           : 闖ｯ蜚
    album_artist    : ABSOLUTE CASTAWAY
    artist          : 荳ｭ諱ｵ蜈牙沁
    CATALOG_NUMBER  : ACCD-0010
    DISCID          : 22046303
    Encoding Params : vers
    iTunSMPB        :  00000000 00000840 00000348 0000000000CF1878 00000000 00000000 00000000 00000000 00000000 00000000
 00000000 00000000
    title           : 繧ｫ繧ｬ繝､
    encoder         : qaac 2.55, CoreAudioToolbox 7.10.5.0, AAC-LC Encoder, CBR 192kbps, Quality 96
    date            : 2009.08.15
  Duration: 00:05:07.83, start: 0.047891, bitrate: 193 kb/s
    Chapter #0:0: start 0.047891, end 307.874830
    Metadata:
      title           : 繧ｫ繧ｬ繝､
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 192 kb/s (default)
    Metadata:
      creation_time   : 2016-04-22 19:58:30
File 'testout.m4a' already exists. Overwrite ? [y/N] y
[ipod @ 04e1e840] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
Output #0, ipod, to 'testout.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 0
    compatible_brands: M4A mp42isom
    date            : 2009.08.15
    track           : 1/3
    genre           : Vocal
    album           : 闖ｯ蜚
    album_artist    : ABSOLUTE CASTAWAY
    artist          : 荳ｭ諱ｵ蜈牙沁
    CATALOG_NUMBER  : ACCD-0010
    DISCID          : 22046303
    Encoding Params : vers
    iTunSMPB        :  00000000 00000840 00000348 0000000000CF1878 00000000 00000000 00000000 00000000 00000000 00000000
 00000000 00000000
    title           : 繧ｫ繧ｬ繝､
    encoder         : Lavf57.34.103
    Chapter #0:0: start 0.000000, end 307.826939
    Metadata:
      title           : 繧ｫ繧ｬ繝､
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, 192 kb/s (default)
    Metadata:
      creation_time   : 2016-04-22 19:58:30
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=    7268kB time=00:05:07.77 bitrate= 193.5kbits/s speed=1.97e+003x
video:0kB audio:7215kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.739564%

ffmpeg -i testout.m4a

ffmpeg version N-79585-g268b5ae Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfi
g --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmfx --enable-libmp3l
ame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enabl
e-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-
libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx
264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  libavutil      55. 22.101 / 55. 22.101
  libavcodec     57. 38.100 / 57. 38.100
  libavformat    57. 34.103 / 57. 34.103
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 44.100 /  6. 44.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testout.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 512
    compatible_brands: isomiso2
    title           : 繧ｫ繧ｬ繝､
    artist          : 荳ｭ諱ｵ蜈牙沁
    album_artist    : ABSOLUTE CASTAWAY
    album           : 闖ｯ蜚
    date            : 2009.08.15
    encoder         : Lavf57.34.103
    genre           : Vocal
    track           : 1/3
  Duration: 00:05:07.83, start: 0.000000, bitrate: 193 kb/s
    Chapter #0:0: start 0.000000, end 307.827000
    Metadata:
      title           : 繧ｫ繧ｬ繝､
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 192 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
    Stream #0:1(eng): Subtitle: mov_text (text / 0x74786574)
    Metadata:
      handler_name    : SubtitleHandler
At least one output file must be specified

[Carl Eugen Hoyos]

Looks like a duplicate of ticket #3668.

[Carl Eugen Hoyos]

Mostly fixed by Roger Combs in 697400ea