Support SCTE-27 / Digicipher II (DCII) subtitles

[Carl Eugen Hoyos]

Samples are available from vlc:
​http://streams.videolan.org/streams/ts/SCTE-27/
​http://streams.videolan.org/issues/13514/

$ ffmpeg -probesize 2G -analyzeduration 2G -i SCTE-27\ Prueba\ 1\ SPTS.mpg
ffmpeg version N-71318-g4ec5762 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      54. 22.100 / 54. 22.100
  libavcodec     56. 34.100 / 56. 34.100
  libavformat    56. 29.100 / 56. 29.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 13.101 /  5. 13.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
[mpeg2video @ 0x2495320] Invalid frame dimensions 0x0.
    Last message repeated 13 times
[mpegts @ 0x2491400] PES packet size mismatch
[mpegts @ 0x2491400] DTS 1243762894 < 1245725354 out of order
[mpegts @ 0x2491400] PES packet size mismatch
[mpegts @ 0x2491400] DTS 1243762894 < 1245725354 out of order
[mpegts @ 0x2491400] PES packet size mismatch
[mpegts @ 0x2491400] DTS 1243762894 < 1245725354 out of order
[mpegts @ 0x2491400] PES packet size mismatch
[mpegts @ 0x2491400] DTS 1243762894 < 1245725354 out of order
[mpegts @ 0x2491400] PES packet size mismatch
[mpegts @ 0x2491400] DTS 1243762894 < 1245725354 out of order
[mpegts @ 0x2491400] PES packet size mismatch
    Last message repeated 1 times
[mpegts @ 0x2491400] Could not find codec parameters for stream 2 (Unknown: none ([130][0][0][0] / 0x0082)): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[mpegts @ 0x2491400] Could not find codec parameters for stream 3 (Unknown: none ([130][0][0][0] / 0x0082)): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mpegts, from 'SCTE-27 Prueba 1 SPTS.mpg':
  Duration: 00:00:04.16, start: 13830.538156, bitrate: 48083 kb/s
  Program 3
    Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv), 720x480 [SAR 32:27 DAR 16:9], max. 2007 kb/s, 29.97 fps, 59.94 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x34]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 384 kb/s
    Stream #0:2[0x15b](por): Unknown: none ([130][0][0][0] / 0x0082)
    Stream #0:3[0x15a](spa): Unknown: none ([130][0][0][0] / 0x0082)
At least one output file must be specified