fmpeg -i Puncture.mkv -c:v copy -c:a:1 libfaac -c:a:2 ac3 -map 0 output.mkv                                           (10:04)
ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jun 18 2012 15:10:40 with llvm_gcc 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.9.00)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/0.11.1 --enable-shared --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-libfreetype --cc=/usr/bin/llvm-gcc --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-aacenc --disable-ffplay
  libavutil      51. 54.100 / 51. 54.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.100 / 54.  6.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     2. 77.100 /  2. 77.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, matroska,webm, from 'Puncture.mkv':
  Metadata:
    creation_time   : 2011-11-15 15:39:28
  Duration: 01:39:44.02, start: 0.000000, bitrate: 5793 kb/s
    Stream #0:0(eng): Video: h264 (High), yuv420p, 1920x800 [SAR 1:1 DAR 12:5], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Stream #0:1(ger): Audio: dts (DTS), 48000 Hz, 5.1(side), s16, 1536 kb/s (default)
    Stream #0:2(eng): Audio: dts (DTS), 48000 Hz, 5.1(side), s16, 1536 kb/s
    Stream #0:3(ger): Subtitle: text (default)
File 'output.mkv' already exists. Overwrite ? [y/N] y
auto-inserting filter 'auto-inserted resampler 0' between the filter 'src' and the filter 'aformat'
[aresample @ 0x7fa7e0c19600] chl:5.1(side) fmt:s16 r:48000Hz -> chl:5.1(side) fmt:flt r:48000Hz
[aformat @ 0x7fa7e0c19d80] auto-inserting filter 'auto-inserted resampler 0' between the filter 'src' and the filter 'aformat'
[aresample @ 0x7fa7e0c1a320] chl:5.1(side) fmt:s16 r:48000Hz -> chl:3.0 fmt:s16 r:48000Hz
Output #0, matroska, to 'output.mkv':
  Metadata:
    creation_time   : 2011-11-15 15:39:28
    Stream #0:0(eng): Video: h264, yuv420p, 1920x800 [SAR 1:1 DAR 12:5], q=2-31, 23.98 fps, 90k tbn, 1k tbc (default)
    Stream #0:1(ger): Audio: vorbis, 48000 Hz, 5.1(side), flt (default)
    Stream #0:2(eng): Audio: aac, 48000 Hz, 3.0, s16, 128 kb/s
    Stream #0:3(ger): Subtitle: ssa (default)
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (dca -> libvorbis)
  Stream #0:2 -> #0:2 (dca -> libfaac)
  Stream #0:3 -> #0:3 (? -> ass)
Decoder (codec text) not found for input stream #0:3