$ ffmpeg -i data/original_input.mp4 -af "volume='if(gt(t,3)*lt(t,6)+gt(t,8)*lt(t,10),0,1)'" -c:a libfdk_aac -strict -2 output.mp4
ffmpeg version 2.6.3 Copyright (c) 2000-2015 the FFmpeg developers
  built with Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.6.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-libfdk-aac --enable-nonfree --enable-vda
  libavutil      54. 20.100 / 54. 20.100
  libavcodec     56. 26.100 / 56. 26.100
  libavformat    56. 25.101 / 56. 25.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 11.102 /  5. 11.102
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'data/original_input.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    creation_time   : 1970-01-01 00:00:00
    encoder         : Lavf53.24.2
  Duration: 00:00:30.38, start: 0.000000, bitrate: 1380 kb/s
    Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x368 [SAR 1:1 DAR 40:23], 993 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : SoundHandler
File 'output.mp4' already exists. Overwrite ? [y/N] y
[libx264 @ 0x7fe281816a00] using SAR=1/1
[libx264 @ 0x7fe281816a00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x7fe281816a00] profile High, level 3.0
[libx264 @ 0x7fe281816a00] 264 - core 144 r2533 c8a773e - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf56.25.101
    Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x368 [SAR 1:1 DAR 40:23], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : VideoHandler
      encoder         : Lavc56.26.100 libx264
    Stream #0:1(und): Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 48000 Hz, 5.1, s16, 488 kb/s (default)
    Metadata:
      creation_time   : 1970-01-01 00:00:00
      handler_name    : SoundHandler
      encoder         : Lavc56.26.100 libfdk_aac
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
frame=  759 fps=165 q=-1.0 Lsize=    3664kB time=00:00:30.37 bitrate= 987.9kbits/s
video:1827kB audio:1816kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.577803%
[libx264 @ 0x7fe281816a00] frame I:8     Avg QP:18.06  size: 28226
[libx264 @ 0x7fe281816a00] frame P:501   Avg QP:23.19  size:  3079
[libx264 @ 0x7fe281816a00] frame B:250   Avg QP:28.88  size:   408
[libx264 @ 0x7fe281816a00] consecutive B-frames: 54.0%  5.3%  2.8% 37.9%
[libx264 @ 0x7fe281816a00] mb I  I16..4: 17.6% 74.7%  7.7%
[libx264 @ 0x7fe281816a00] mb P  I16..4:  0.5%  1.9%  0.2%  P16..4: 32.0% 12.8%  7.4%  0.0%  0.0%    skip:45.2%
[libx264 @ 0x7fe281816a00] mb B  I16..4:  0.1%  0.2%  0.0%  B16..8: 14.8%  1.2%  0.3%  direct: 0.4%  skip:83.0%  L0:42.6% L1:50.4% BI: 7.0%
[libx264 @ 0x7fe281816a00] 8x8 transform intra:74.4% inter:74.5%
[libx264 @ 0x7fe281816a00] coded y,uvDC,uvAC intra: 70.2% 83.7% 40.0% inter: 13.6% 15.7% 1.3%
[libx264 @ 0x7fe281816a00] i16 v,h,dc,p: 14% 39%  7% 40%
[libx264 @ 0x7fe281816a00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 19% 19%  6%  7%  7%  7%  8%  8%
[libx264 @ 0x7fe281816a00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 23% 14%  6% 10%  8%  9%  7%  7%
[libx264 @ 0x7fe281816a00] i8c dc,h,v,p: 40% 25% 23% 12%
[libx264 @ 0x7fe281816a00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7fe281816a00] ref P L0: 72.6% 17.9%  7.4%  2.1%
[libx264 @ 0x7fe281816a00] ref B L0: 87.7%  9.7%  2.5%
[libx264 @ 0x7fe281816a00] ref B L1: 96.8%  3.2%
[libx264 @ 0x7fe281816a00] kb/s:492.81