ffmpeg -i right.webm -t 00:00:10 -filter_complex '[0]setpts=PTS-STARTPTS; [0]silencedetect=d=0.01' -v 32 -f null /dev/null
ffmpeg version 2.7.2 Copyright (c) 2000-2015 the FFmpeg developers
  built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.7.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-libtheora --enable-libvorbis --enable-libvpx --enable-vda
  libavutil      54. 27.100 / 54. 27.100
  libavcodec     56. 41.100 / 56. 41.100
  libavformat    56. 36.100 / 56. 36.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 16.101 /  5. 16.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.100 /  1.  2.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, matroska,webm, from 'right.webm':
  Metadata:
    encoder         : libwebm-0.2.1.0
    creation_time   : 2015-12-01 17:32:45
  Duration: 00:00:20.96, start: 0.000000, bitrate: 602 kb/s
    Stream #0:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)
    Stream #0:1(eng): Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 1k tbr, 1k tbn, 1k tbc (default)
Output #0, null, to '/dev/null':
  Metadata:
    encoder         : Lavf56.36.100
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 1k fps, 1k tbn, 1k tbc (default)
    Metadata:
      encoder         : Lavc56.41.100 rawvideo
    Stream #0:1: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s (default)
    Metadata:
      encoder         : Lavc56.41.100 pcm_s16le
Stream mapping:
  Stream #0:0 (opus) -> silencedetect
  Stream #0:1 (vp8) -> setpts
  setpts -> Stream #0:0 (rawvideo)
  silencedetect -> Stream #0:1 (pcm_s16le)
Press [q] to stop, [?] for help
[null @ 0x7f8e1c000c00] Encoder did not produce proper pts, making some up.
##################### I WANT TO GRAB THIS LINE RIGHT HERE
[silencedetect @ 0x7f8e19f016c0] silence_start: 3.687
[silencedetect @ 0x7f8e19f016c0] silence_end: 3.717 | silence_duration: 0.03
[silencedetect @ 0x7f8e19f016c0] silence_start: 3.707
[silencedetect @ 0x7f8e19f016c0] silence_end: 3.797 | silence_duration: 0.09
[silencedetect @ 0x7f8e19f016c0] silence_start: 3.807
[silencedetect @ 0x7f8e19f016c0] silence_end: 3.837 | silence_duration: 0.03
[silencedetect @ 0x7f8e19f016c0] silence_start: 7.147
[silencedetect @ 0x7f8e19f016c0] silence_end: 7.177 | silence_duration: 0.03
[silencedetect @ 0x7f8e19f016c0] silence_start: 7.187
[silencedetect @ 0x7f8e19f016c0] silence_end: 7.197 | silence_duration: 0.01
[silencedetect @ 0x7f8e19f016c0] silence_start: 7.207
[silencedetect @ 0x7f8e19f016c0] silence_end: 7.217 | silence_duration: 0.01
[silencedetect @ 0x7f8e19f016c0] silence_start: 7.227
[silencedetect @ 0x7f8e19f016c0] silence_end: 7.277 | silence_duration: 0.05
[silencedetect @ 0x7f8e19f016c0] silence_start: 10.407
[silencedetect @ 0x7f8e19f016c0] silence_end: 10.437 | silence_duration: 0.03
[silencedetect @ 0x7f8e19f016c0] silence_start: 10.447
[silencedetect @ 0x7f8e19f016c0] silence_end: 10.457 | silence_duration: 0.01
[silencedetect @ 0x7f8e19f016c0] silence_start: 10.467
[silencedetect @ 0x7f8e19f016c0] silence_end: 10.497 | silence_duration: 0.03
[silencedetect @ 0x7f8e19f016c0] silence_start: 10.487
[silencedetect @ 0x7f8e19f016c0] silence_end: 10.517 | silence_duration: 0.03
[silencedetect @ 0x7f8e19f016c0] silence_start: 10.527
[silencedetect @ 0x7f8e19f016c0] silence_end: 10.557 | silence_duration: 0.03
[silencedetect @ 0x7f8e19f016c0] silence_start: 10.567
[silencedetect @ 0x7f8e19f016c0] silence_end: 10.617 | silence_duration: 0.05
[silencedetect @ 0x7f8e19f016c0] silence_start: 10.607
[silencedetect @ 0x7f8e19f016c0] silence_end: 10.637 | silence_duration: 0.03
[silencedetect @ 0x7f8e19f016c0] silence_start: 10.647
[silencedetect @ 0x7f8e19f016c0] silence_end: 10.657 | silence_duration: 0.01
[silencedetect @ 0x7f8e19f016c0] silence_start: 10.647
[silencedetect @ 0x7f8e19f016c0] silence_end: 11.317 | silence_duration: 0.67
[silencedetect @ 0x7f8e19f016c0] silence_start: 11.307
[silencedetect @ 0x7f8e19f016c0] silence_end: 11.537 | silence_duration: 0.23
frame=  300 fps=0.0 q=0.0 Lsize=N/A time=00:00:10.01 bitrate=N/A
video:28kB audio:602kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown