/usr/bin/ffmpeg -i F.mkv -threads 2 -vcodec mpeg2video -qscale 1 -r 25 -f yuv420p -vf pad=720:576:0:40:black -acodec mp2 -ac 2 -ab 192k -async 1 -scodec dvbsub -slang eng -f mpegts -y 00001.ts

FFmpeg version UNKNOWN, Copyright (c) 2000-2011 the FFmpeg developers
  built on Feb  3 2011 23:29:19 with gcc 4.5.0 20100604 [gcc-4_5-branch revision 160292]
  configuration: --prefix=/usr --mandir=/usr/share/man --libdir=/usr/lib64 --shlibdir=/usr/lib64 --enable-pthreads --enable-shared --enable-avfilter --disable-static --enable-libmp3lame --enable-libxvid --enable-libx264 --enable-postproc --enable-shared --enable-libdc1394 --enable-libtheora --enable-libschroedinger --enable-libvpx --enable-gpl --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-version3
  libavutil    50. 36. 0 / 50. 36. 0
  libavcore     0. 16. 1 /  0. 16. 1
  libavcodec   52.108. 0 / 52.108. 0
  libavformat  52. 94. 0 / 52. 94. 0
  libavdevice  52.  2. 3 / 52.  2. 3
  libavfilter   1. 74. 0 /  1. 74. 0
  libswscale    0. 12. 0 /  0. 12. 0
  libpostproc  51.  2. 0 / 51.  2. 0
[matroska,webm @ 0x625510] Estimating duration from bitrate, this may be inaccurate
Input #0, matroska,webm, from 'F.mkv':
  Duration: 00:45:58.79, start: 0.000000, bitrate: 448 kb/s
    Chapter #0.0: start 0.000000, end 53.678622
    Metadata:
      title           : Chapter 1
    Chapter #0.1: start 53.678622, end 367.367000
    Metadata:
      title           : Chapter 2
    Chapter #0.2: start 367.367000, end 907.239667
    Metadata:
      title           : Chapter 3
    Chapter #0.3: start 907.239667, end 1274.064456
    Metadata:
      title           : Chapter 4
    Chapter #0.4: start 1274.064456, end 1804.219078
    Metadata:
      title           : Chapter 5
    Chapter #0.5: start 1804.219078, end 2411.075333
    Metadata:
      title           : Chapter 6
    Chapter #0.6: start 2411.075333, end 2758.798000
    Metadata:
      title           : Chapter 7
    Stream #0.0(eng): Video: h264, yuv420p, 720x496 [PAR 863:720 DAR 863:496], PAR 175:146 DAR 7875:4526, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc
    Stream #0.1(eng): Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    Stream #0.2(eng): Subtitle: [0][0][0][0] / 0x0000
    Metadata:
      title           : English
[buffer @ 0x6881b0] w:720 h:496 pixfmt:yuv420p
[pad @ 0x683290] w:720 h:496 -> w:720 h:576 x:0 y:40 color:0x108080FF[yuva]
Output #0, mpegts, to 'Farscape-s04e05.Promises.ts':
    Stream #0.0(eng): Video: mpeg2video, yuv420p, 720x576 [PAR 175:146 DAR 875:584], q=2-31, 200 kb/s, 90k tbn, 25 tbc
    Stream #0.1(eng): Audio: mp2, 48000 Hz, 2 channels, s16, 192 kb/s
    Stream #0.2(eng): Subtitle: dvbsub
    Metadata:
      title           : English
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
  Stream #0.2 -> #0.2
Decoder (codec id 94210) not found for input stream #0.2