gistfile1.txt

$ ffmpeg -y -filter_complex 'amovie=/home/nurono/Desktop/kmvso.mp3, atrim=start=0:end=10, afade=t=in:st=0:d=2' n1.mp3

ffmpeg version N-40693-gf7bbe0f-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2000-2014 the FFmpeg developers
  built on Sep  9 2014 02:20:35 with gcc 4.8 (Debian 4.8.3-10)
  configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --disable-ffserver --enable-libass --enable-gnutls --cc=gcc-4.8
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  4.101 / 56.  4.101
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  1.100 /  5.  1.100
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Output #0, mp3, to 'n1.mp3':
  Metadata:
    TSSE            : Lavf56.4.101
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p (default)
    Metadata:
      encoder         : Lavc56.1.100 libmp3lame
Stream mapping:
  afade -> Stream #0:0 (libmp3lame)
Press [q] to stop, [?] for help
size=     157kB time=00:00:10.00 bitrate= 128.2kbits/s
video:0kB audio:156kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.141181%



$ ffmpeg -y -filter_complex 'amovie=/home/nurono/Desktop/kmvso.mp3, atrim=start=0:end=10, afade=t=in:st=0:d=2, afade=t=out:st=8:d=2' n2.mp3

ffmpeg version N-40693-gf7bbe0f-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2000-2014 the FFmpeg developers
  built on Sep  9 2014 02:20:35 with gcc 4.8 (Debian 4.8.3-10)
  configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --disable-ffserver --enable-libass --enable-gnutls --cc=gcc-4.8
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  4.101 / 56.  4.101
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  1.100 /  5.  1.100
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Output #0, mp3, to 'n2.mp3':
  Metadata:
    TSSE            : Lavf56.4.101
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p (default)
    Metadata:
      encoder         : Lavc56.1.100 libmp3lame
Stream mapping:
  afade -> Stream #0:0 (libmp3lame)
Press [q] to stop, [?] for help
size=     157kB time=00:00:10.00 bitrate= 128.2kbits/s
video:0kB audio:156kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.141181%



$ ffmpeg -y -i /home/nurono/Desktop/kmvso.mp3 -filter_complex 'atrim=start=0:end=10, afade=t=in:st=0:d=2, afade=t=out:st=8:d=2' n3.mp3

ffmpeg version N-40693-gf7bbe0f-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2000-2014 the FFmpeg developers
  built on Sep  9 2014 02:20:35 with gcc 4.8 (Debian 4.8.3-10)
  configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --disable-ffserver --enable-libass --enable-gnutls --cc=gcc-4.8
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  4.101 / 56.  4.101
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  1.100 /  5.  1.100
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Input #0, mp3, from '/home/nurono/Desktop/kmvso.mp3':
  Metadata:
    title           : Warrior Concerto
    artist          : The Glitch Mob
    track           : /
    album           : We Can Make The World Stop
    disc            : /
  Duration: 00:03:39.74, start: 0.025056, bitrate: 325 kb/s
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
    Metadata:
      encoder         : LAME3.98r
    Side data:
      replaygain: track gain - -10.300000, track peak - unknown, album gain - unknown, album peak - unknown,
    Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg), 600x600 [SAR 1:1 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
    Metadata:
      title           : Front cover
      comment         : Cover (front)
[swscaler @ 0x3cdc560] deprecated pixel format used, make sure you did set range correctly
[mp3 @ 0x3cf0940] Frame rate very high for a muxer not efficiently supporting it.
Please consider specifying a lower framerate, a different muxer or -vsync 2
Output #0, mp3, to 'n3.mp3':
  Metadata:
    TIT2            : Warrior Concerto
    TPE1            : The Glitch Mob
    TRCK            : /
    TALB            : We Can Make The World Stop
    TPOS            : /
    TSSE            : Lavf56.4.101
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p
    Metadata:
      encoder         : Lavc56.1.100 libmp3lame
    Stream #0:1: Video: png, rgb24, 600x600 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 90k fps, 90k tbn, 90k tbc
    Metadata:
      title           : Front cover
      comment         : Cover (front)
      encoder         : Lavc56.1.100 png
Stream mapping:
  Stream #0:0 (mp3) -> atrim (graph 0)
  afade (graph 0) -> Stream #0:0 (libmp3lame)
  Stream #0:1 -> #0:1 (mjpeg (native) -> png (native))
Press [q] to stop, [?] for help
frame=    1 fps=0.9 q=0.0 Lsize=     946kB time=00:00:10.00 bitrate= 774.3kbits/s
video:789kB audio:157kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.039045%


$ mplayer n1.mp3
$ # my comments: only atrim applied, no afade=t=in, sound is on and unchanged
$
$ mplayer n2.mp3
$ # atrim applied, sound is totally off
$
$ mplayer n3.mp3
$ # all the filters applied as expected