ffmpeg -ss 1024 -i input.mkv -c:v mpeg2video -g 1 -q:v 1 -qmin 2 -c:a ac3 -bufsize 7000000 -maxrate 54000000 output.mpeg
ffmpeg version N-42547-g7543fd8 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jul 15 2012 21:36:07 with gcc 4.7.1
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --e
nable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc
 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      51. 65.100 / 51. 65.100
  libavcodec     54. 40.100 / 54. 40.100
  libavformat    54. 16.104 / 54. 16.104
  libavdevice    54.  1.100 / 54.  1.100
  libavfilter     3.  2.100 /  3.  2.100
  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 'input.mkv':
  Metadata:
    creation_time   : 2012-06-13 04:28:04
  Duration: 00:43:25.50, start: 0.000000, bitrate: 3880 kb/s
    Stream #0:0(eng): Video: h264 (High), yuv420p, 1280x720, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
    Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), s16, 384 kb/s (default)
Output #0, mpeg, to 'output.mpeg':
  Metadata:
    encoder         : Lavf54.16.104
    Stream #0:0(eng): Video: mpeg2video, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 29.97 tbc (default)
    Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), flt, 448 kb/s (default)
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> mpeg2video)
  Stream #0:1 -> #0:1 (ac3 -> ac3)
Press [q] to stop, [?] for help
DTS -2479, next:-733 st:0 invalid dropping
PTS -2413, next:-733 invalid dropping st:0
DTS -2446, next:32267 st:0 invalid dropping
PTS -2446, next:32267 invalid dropping st:0
DTS -2413, next:65267 st:0 invalid dropping
PTS -2379, next:65267 invalid dropping st:0
DTS -2379, next:98267 st:0 invalid dropping
PTS -2213, next:98267 invalid dropping st:0
DTS -2346, next:131267 st:0 invalid dropping
PTS -2279, next:131267 invalid dropping st:0
DTS -2313, next:164267 st:0 invalid dropping
PTS -2313, next:164267 invalid dropping st:0
DTS -2279, next:197267 st:0 invalid dropping
PTS -2246, next:197267 invalid dropping st:0
DTS -2246, next:230267 st:0 invalid dropping
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DTS -2213, next:263267 st:0 invalid dropping
PTS -2146, next:263267 invalid dropping st:0
DTS -2146, next:-2146000 st:0 invalid dropping
PTS -2112, next:-2146000 invalid dropping st:0
DTS -2112, next:-2113000 st:0 invalid dropping
PTS -1946, next:-2113000 invalid dropping st:0
DTS -2079, next:-2080000 st:0 invalid dropping
PTS -2012, next:-2080000 invalid dropping st:0
DTS -2012, next:-2013000 st:0 invalid dropping
PTS -1979, next:-2013000 invalid dropping st:0
DTS -1979, next:-1980000 st:0 invalid dropping
PTS -1846, next:-1980000 invalid dropping st:0
DTS -1946, next:-1947000 st:0 invalid dropping
PTS -1879, next:-1947000 invalid dropping st:0
DTS -1912, next:-1914000 st:0 invalid dropping
PTS -1912, next:-1914000 invalid dropping st:0
frame=17755 fps=301 q=1.0 Lsize= 1914694kB time=00:09:52.39 bitrate=26477.7kbits/s dup=2 drop=74
video:1874973kB audio:32536kB subtitle:0 global headers:0kB muxing overhead 0.376668%