COMMAND:
--------
ffmpeg -v verbose -i "demo-1080-movie-weird-subtext.mkv"  -i "demo-anime.id1.aac" -map 0:1  -strict -2  -map 0:v -c:v libx264   -ac 2 -c:a aac   -map 0:4   -metadata description='Encoded by VHS (Video Handler Script 1.0.5), using ffmpeg 2.1.5' -f mp4 "demo-1080-movie-weird-subtext.2.mp4"

OUTPUT:
-------
ffmpeg version 2.1.5 Copyright (c) 2000-2014 the FFmpeg developers
  built on Jul  8 2014 20:44:17 with gcc 4.8.3 (GCC) 20140624 (Red Hat 4.8.3-1)
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-libass --enable-libcdio --enable-libcelt --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  libavutil      52. 48.101 / 52. 48.101
  libavcodec     55. 39.101 / 55. 39.101
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.100 /  3. 90.100
  libavresample   1.  1.  0 /  1.  1.  0
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
[matroska,webm @ 0x1e8a3c0] max_analyze_duration 5000000 reached at 5005000 microseconds
[matroska,webm @ 0x1e8a3c0] Could not find codec parameters for stream 2 (Subtitle: hdmv_pgs_subtitle): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, matroska,webm, from 'demo-1080-movie-weird-subtext.mkv':
  Metadata:
    COMPOSER        : Encoded by VHS (Video Handler Script 0.9.1), using ffmpeg 2.1.5
    DESCRIPTION     : Encoded by VHS (Video Handler Script 0.9.1), using ffmpeg 2.1.5
    ENCODER         : Lavf55.19.104
  Duration: 00:01:00.10, start: 0.078000, bitrate: 4085 kb/s
    Chapter #0.0: start 0.000000, end 60.000000
    Metadata:
      title           : 00:00:00.000
    Stream #0:0(eng): Video: h264 (High), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Stream #0:1(eng): Subtitle: hdmv_pgs_subtitle, 1920x1080
    Stream #0:2(eng): Subtitle: hdmv_pgs_subtitle
    Stream #0:3(ger): Subtitle: hdmv_pgs_subtitle, 1920x1080
    Stream #0:4(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s (default)
[aac @ 0x2184c40] max_analyze_duration 5000000 reached at 5013333 microseconds
[aac @ 0x2184c40] Estimating duration from bitrate, this may be inaccurate
Input #1, aac, from 'demo-anime.id1.aac':
  Duration: 00:01:02.17, bitrate: 126 kb/s
    Stream #1:0: Audio: aac, 48000 Hz, stereo, fltp, 126 kb/s
Output #0, mp4, to 'demo-1080-movie-weird-subtext.2.mp4':
  Metadata:
    COMPOSER        : Encoded by VHS (Video Handler Script 0.9.1), using ffmpeg 2.1.5
    ENCODER         : Lavf55.19.104
    description     : Encoded by VHS (Video Handler Script 1.0.5), using ffmpeg 2.1.5
    Chapter #0.0: start 0.000000, end 59.922000
    Metadata:
      title           : 00:00:00.000
    Stream #0:0(eng): Subtitle: none, 128 kb/s
    Stream #0:1(eng): Video: h264, q=-1--1, 90k tbn
    Stream #0:2(eng): Audio: aac, 2 channels, 128 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (pgssub -> ?)
  Stream #0:0 -> #0:1 (h264 -> libx264)
  Stream #0:4 -> #0:2 (ac3 -> aac)
Encoder (codec none) not found for output stream #0:0