CCExtractor's main program is console based. There's a GUI for Windows, as well as provisions so other programs can easily interface with CCExtractor, but the heavy lefting is done by a command line program (that can be called by scripts so integration with larger processes is straightforward).

Running CCExtractor without any parameter will display a help screen with all the options. As of version 0.81 the help screen is as follows:

CCExtractor 0.81, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
Originally based on McPoodle's tools. Check his page for lots of information
on closed captions technical details.
(http://www.theneitherworld.com/mcpoodle/SCC_TOOLS/DOCS/SCC_TOOLS.HTML)

This tool home page:
http://www.ccextractor.org
  Extracts closed captions and teletext subtitles from video streams.
    (DVB, .TS, ReplayTV 4000 and 5000, dvr-ms, bttv, Tivo, Dish Network,
     .mp4, HDHomeRun are known to work).

  Syntax:
  ccextractor [options] inputfile1 [inputfile2...] [-o outputfilename]

To see This Help Message: -h or --help

File name related options:
            inputfile: file(s) to process
    -o outputfilename: Use -o parameters to define output filename if you don't
                       like the default ones (same as infile plus _1 or _2 when
                       needed and file extension, e.g. .srt).
                           -o or -o1 -> Name of the first (maybe only) output
                                        file.
                           -o2       -> Name of the second output file, when
                                        it applies.
         -cf filename: Write 'clean' data to a file. Cleans means the ES
                       without TS or PES headers.
              -stdout: Write output to stdout (console) instead of file. If
                       stdout is used, then -o, -o1 and -o2 can't be used. Also
                       -stdout will redirect all messages to stderr (error).

               -stdin: Reads input from stdin (console) instead of file.
You can pass as many input files as you need. They will be processed in order.
If a file name is suffixed by +, ccextractor will try to follow a numerical
sequence. For example, DVD001.VOB+ means DVD001.VOB, DVD002.VOB and so on
until there are no more files.
Output will be one single file (either raw or srt). Use this if you made your
recording in several cuts (to skip commercials for example) but you want one
subtitle file with contiguous timing.

Effect output files
    -outinterval x output in interval of x seconds
Network support:
            -udp port: Read the input via UDP (listening in the specified port)
                       instead of reading a file.

            -udp [host:]port: Read the input via UDP (listening in the specified
                              port) instead of reading a file. Host can be a
                              hostname or IPv4 address. If host is not specified
                              then listens on the local host.

            -sendto host[:port]: Sends data in BIN format to the server according
                                 to the CCExtractor's protocol over TCP. For IPv6
                                 use [addres]:port
            -tcp port: Reads the input data in BIN format according to CCExtractor's
                       protocol, listening specified port on the local host
            -tcppassword password: Sets server password for new connections to tcp server
            -tcpdesc description: Sends to the server short description about captions e.g.
                                  channel name or file name
Options that affect what will be processed:
          -1, -2, -12: Output Field 1 data, Field 2 data, or both
                       (DEFAULT is -1)
Use --append to prevent overwriting of existing files. The output will be appended instead.
-cc2: When in srt/sami mode, process captions in channel 2
                       instead of channel 1.
-svc --service N1[cs1],N2[cs2]...:
                       Enable CEA-708 (DTVCC) captions processing for the listed
                       services. The parameter is a comma delimited list
                       of services numbers, such as "1,2" to process the
                       primary and secondary language services.
                       Pass "all" to process all services found.

                       If captions in a service are stored in 16-bit encoding, you can
                       specify what charset or encoding was used. Pass its name after
                       service number (e.g. "1[EUC-KR],3" or "all[EUC-KR]") and it will
                       encode specified charset to UTF-8 using iconv. See iconv documentation
                       to check if required encoding/charset is supported.

In general, if you want English subtitles you don't need to use these options
as they are broadcast in field 1, channel 1. If you want the second language
(usually Spanish) you may need to try -2, or -cc2, or both.

Input formats:
       With the exception of McPoodle's raw format, which is just the closed
       caption data with no other info, CCExtractor can usually detect the
       input format correctly. To force a specific format:

                  -in=format

       where format is one of these:
                       ts   -> For Transport Streams.
                       ps   -> For Program Streams.
                       es   -> For Elementary Streams.
                       asf  -> ASF container (such as DVR-MS).
                       wtv  -> Windows Television (WTV)
                       bin  -> CCExtractor's own binary format.
                       raw  -> For McPoodle's raw files.
                       mp4  -> MP4/MOV/M4V and similar.
       -ts, -ps, -es, -mp4, -wtv and -asf (or --dvr-ms) can be used as shorts.

Output formats:

                 -out=format

       where format is one of these:
                      srt     -> SubRip (default, so not actually needed).
                      ass/ssa -> SubStation Alpha.
                      webvtt  -> WebVTT format
                      sami    -> MS Synchronized Accesible Media Interface.
                      bin     -> CC data in CCExtractor's own binary format.
                      raw     -> CC data in McPoodle's Broadcast format.
                      dvdraw  -> CC data in McPoodle's DVD format.
                      txt     -> Transcript (no time codes, no roll-up
                                 captions, just the plain transcription.
                      ttxt    -> Timed Transcript (transcription with time
                                 info)
                      smptett -> SMPTE Timed Text (W3C TTML) format.
                      spupng  -> Set of .xml and .png files for use with
                                 dvdauthor's spumux.
                                 See "Notes on spupng output format"
                      null    -> Don't produce any file output
                      report  -> Prints to stdout information about captions
                                 in specified input. Don't produce any file
                                 output

Options that affect how input files will be processed.
        -gt --goptime: Use GOP for timing instead of PTS. This only applies
                       to Program or Transport Streams with MPEG2 data and
                       overrides the default PTS timing.
                       GOP timing is always used for Elementary Streams.
    -nogt --nogoptime: Never use GOP timing (use PTS), even if ccextractor
                       detects GOP timing is the reasonable choice.
     -fp --fixpadding: Fix padding - some cards (or providers, or whatever)
                       seem to send 0000 as CC padding instead of 8080. If you
                       get bad timing, this might solve it.
               -90090: Use 90090 (instead of 90000) as MPEG clock frequency.
                       (reported to be needed at least by Panasonic DMR-ES15
                       DVD Recorder)
    -ve --videoedited: By default, ccextractor will process input files in
                       sequence as if they were all one large file (i.e.
                       split by a generic, non video-aware tool. If you
                       are processing video hat was split with a editing
                       tool, use -ve so ccextractor doesn't try to rebuild
                       the original timing.
   -s --stream [secs]: Consider the file as a continuous stream that is
                       growing as ccextractor processes it, so don't try
                       to figure out its size and don't terminate processing
                       when reaching the current end (i.e. wait for more
                       data to arrive). If the optional parameter secs is
                       present, it means the number of seconds without any
                       new data after which ccextractor should exit. Use
                       this parameter if you want to process a live stream
                       but not kill ccextractor externally.
                       Note: If -s is used then only one input file is
                       allowed.
  -poc  --usepicorder: Use the pic_order_cnt_lsb in AVC/H.264 data streams
                       to order the CC information.  The default way is to
                       use the PTS information.  Use this switch only when
                       needed.
                -myth: Force MythTV code branch.
              -nomyth: Disable MythTV code branch.
                       The MythTV branch is needed for analog captures where
                       the closed caption data is stored in the VBI, such as
                       those with bttv cards (Hauppage 250 for example). This
                       is detected automatically so you don't need to worry
                       about this unless autodetection doesn't work for you.
       -wtvconvertfix: This switch works around a bug in Windows 7's built in
                       software to convert *.wtv to *.dvr-ms. For analog NTSC
                       recordings the CC information is marked as digital
                       captions. Use this switch only when needed.
            -wtvmpeg2: Read the captions from the MPEG2 video stream rather
                       than the captions stream in WTV files
 -pn --program-number: In TS mode, specifically select a program to process.
                       Not needed if the TS only has one. If this parameter
                       is not specified and CCExtractor detects more than one
                       program in the input, it will list the programs found
                       and terminate without doing anything, unless
                       -autoprogram (see below) is used.
         -autoprogram: If there's more than one program in the stream, just use
                       the first one we find that contains a suitable stream.
             -datapid: Don't try to find out the stream for caption/teletext
                       data, just use this one instead.
      -datastreamtype: Instead of selecting the stream by its PID, select it
                       by its type (pick the stream that has this type in
                       the PMT)
          -streamtype: Assume the data is of this type, don't autodetect. This
                       parameter may be needed if -datapid or -datastreamtype
                       is used and CCExtractor cannot determine how to process
                       the stream. The value will usually be 2 (MPEG video) or
                       6 (MPEG private data).
    -haup --hauppauge: If the video was recorder using a Hauppauge card, it
                       might need special processing. This parameter will
                       force the special treatment.
         -mp4vidtrack: In MP4 files the closed caption data can be embedded in
                       the video track or in a dedicated CC track. If a
                       dedicated track is detected it will be processed instead
                       of the video track. If you need to force the video track
                       to be processed instead use this option.
       -noautotimeref: Some streams come with broadcast date information. When
                       such data is available, CCExtractor will set its time
                       reference to the received data. Use this parameter if
                       you prefer your own reference. Note: Current this only
                       affects Teletext in timed transcript with -datets.
           --noscte20: Ignore SCTE-20 data if present.

Options that affect what kind of output will be produced:
                 -bom: Append a BOM (Byte Order Mark) to output files.
                       Note that most text processing tools in linux will not
                       like BOM.
                       This is the default in Windows builds.
               -nobom: Do not append a BOM (Byte Order Mark) to output files.
                       Note that this may break files when using Windows.
                       This is the default in non-Windows builds.
             -unicode: Encode subtitles in Unicode instead of Latin-1.
                -utf8: Encode subtitles in UTF-8 (no longer needed.
                       because UTF-8 is now the default).
              -latin1: Encode subtitles in Latin-1
  -nofc --nofontcolor: For .srt/.sami/.vtt, don't add font color tags.
  --nohtmlescape: For .srt/.sami/.vtt, don't covert html unsafe character
-nots --notypesetting: For .srt/.sami/.vtt, don't add typesetting tags.
                -trim: Trim lines.
   -dc --defaultcolor: Select a different default color (instead of
                       white). This causes all output in .srt/.smi/.vtt
                       files to have a font tag, which makes the files
                       larger. Add the color you want in RGB, such as
                       -dc #FF0000 for red.
    -sc --sentencecap: Sentence capitalization. Use if you hate
                       ALL CAPS in subtitles.
  --capfile -caf file: Add the contents of 'file' to the list of words
                       that must be capitalized. For example, if file
                       is a plain text file that contains

                       Tony
                       Alan

                       Whenever those words are found they will be written
                       exactly as they appear in the file.
                       Use one line per word. Lines starting with # are
                       considered comments and discarded.

          -unixts REF: For timed transcripts that have an absolute date
                       instead of a timestamp relative to the file start), use
                       this time reference (UNIX timestamp). 0 => Use current
                       system time.
                       ccextractor will automatically switch to transport
                       stream UTC timestamps when available.
              -datets: In transcripts, write time as YYYYMMDDHHMMss,ms.
               -sects: In transcripts, write time as ss,ms
                -UCLA: Transcripts are generated with a specific format
                       that is convenient for a specific project, feel
                       free to play with it but be aware that this format
                       is really live - don't rely on its output format
                       not changing between versions.
                  -lf: Use LF (UNIX) instead of CRLF (DOS, Windows) as line
                       terminator.
            -autodash: Based on position on screen, attempt to determine
                       the different speakers and a dash (-) when each
                       of them talks (.srt/.vtt only, -trim required).
          -xmltv mode: produce an XMLTV file containing the EPG data from
                       the source TS file. Mode: 1 = full output
                       2 = live output. 3 = both
                 -sem: Create a .sem file for each output file that is open
                       and delete it on file close.

Options that affect how ccextractor reads and writes (buffering):
    -bi --bufferinput: Forces input buffering.
 -nobi -nobufferinput: Disables input buffering.
 -bs --buffersize val: Specify a size for reading, in bytes (suffix with K or
                       or M for kilobytes and megabytes). Default is 16M.
                 -koc: keep-output-close. If used then CCExtractor will close
                       the output file after writing each subtitle frame and
                       attempt to create it again when needed.
     -ff --forceflush: Flush the file buffer whenever content is written.

Options that affect the built-in closed caption decoder:
                 -dru: Direct Roll-Up. When in roll-up mode, write character by
                       character instead of line by line. Note that this
                       produces (much) larger files.
     -noru --norollup: If you hate the repeated lines caused by the roll-up
                       emulation, you can have ccextractor write only one
                       line at a time, getting rid of these repeated lines.
     -ru1 / ru2 / ru3: roll-up captions can consist of 2, 3 or 4 visible
                       lines at any time (the number of lines is part of
                       the transmission). If having 3 or 4 lines annoys
                       you you can use -ru to force the decoder to always
                       use 1, 2 or 3 lines. Note that 1 line is not
                       a real mode rollup mode, so CCExtractor does what
                       it can.
                       In -ru1 the start timestamp is actually the timestamp
                       of the first character received which is possibly more
                       accurate.

Options that affect timing:
            -delay ms: For srt/sami/webvtt, add this number of milliseconds to
                       all times. For example, -delay 400 makes subtitles
                       appear 400ms late. You can also use negative numbers
                       to make subs appear early.
Notes on times: -startat and -endat times are used first, then -delay.
So if you use -srt -startat 3:00 -endat 5:00 -delay 120000, ccextractor will
generate a .srt file, with only data from 3:00 to 5:00 in the input file(s)
and then add that (huge) delay, which would make the final file start at
5:00 and end at 7:00.

Options that affect what segment of the input file(s) to process:
        -startat time: Only write caption information that starts after the
                       given time.
                       Time can be seconds, MM:SS or HH:MM:SS.
                       For example, -startat 3:00 means 'start writing from
                       minute 3.
          -endat time: Stop processing after the given time (same format as
                       -startat).
                       The -startat and -endat options are honored in all
                       output formats.  In all formats with timing information
                       the times are unchanged.
-scr --screenfuls num: Write 'num' screenfuls and terminate processing.

Options that affect which codec is to be used have to be searched in input
  If codec type is not selected then first elementary stream suitable for
  subtitle is selected, please consider -teletext -noteletext override this
  option.
      -codec dvbsub    select the dvb subtitle from all elementary stream,
                        if stream of dvb subtitle type is not found then
                        nothing is selected and no subtitle is generated
      -nocodec dvbsub   ignore dvb subtitle and follow default behaviour
      -codec teletext   select the teletext subtitle from elementary stream
      -nocodec teletext ignore teletext subtitle
  NOTE: option given in form -foo=bar ,-foo = bar and --foo=bar are invalid
        valid option are only in form -foo bar
        nocodec and codec parameter must not be same if found to be same
        then parameter of nocodec is ignored, this flag should be passed
        once, more then one are not supported yet and last parameter would
        taken in consideration
Adding start and end credits:
  CCExtractor can _try_ to add a custom message (for credits for example) at
  the start and end of the file, looking for a window where there are no
  captions. If there is no such window, then no text will be added.
  The start window must be between the times given and must have enough time
  to display the message for at least the specified time.
        --startcreditstext txt: Write this text as start credits. If there are
                                several lines, separate them with the
                                characters \n, for example Line1\nLine 2.
  --startcreditsnotbefore time: Don't display the start credits before this
                                time (S, or MM:SS). Default: 0
   --startcreditsnotafter time: Don't display the start credits after this
                                time (S, or MM:SS). Default: 5:00
 --startcreditsforatleast time: Start credits need to be displayed for at least
                                this time (S, or MM:SS). Default: 2
  --startcreditsforatmost time: Start credits should be displayed for at most
                                this time (S, or MM:SS). Default: 5
          --endcreditstext txt: Write this text as end credits. If there are
                                several lines, separate them with the
                                characters \n, for example Line1\nLine 2.
   --endcreditsforatleast time: End credits need to be displayed for at least
                                this time (S, or MM:SS). Default: 2
    --endcreditsforatmost time: End credits should be displayed for at most
                                this time (S, or MM:SS). Default: 5

Options that affect debug data:
               -debug: Show lots of debugging output.
                 -608: Print debug traces from the EIA-608 decoder.
                       If you need to submit a bug report, please send
                       the output from this option.
                 -708: Print debug information from the (currently
                       in development) EIA-708 (DTV) decoder.
              -goppts: Enable lots of time stamp output.
            -xdsdebug: Enable XDS debug data (lots of it).
               -vides: Print debug info about the analysed elementary
                       video stream.
               -cbraw: Print debug trace with the raw 608/708 data with
                       time stamps.
              -nosync: Disable the syncing code.  Only useful for debugging
                       purposes.
             -fullbin: Disable the removal of trailing padding blocks
                       when exporting to bin format.  Only useful for
                       for debugging purposes.
          -parsedebug: Print debug info about the parsed container
                       file. (Only for TS/ASF files at the moment.)
            -parsePAT: Print Program Association Table dump.
            -parsePMT: Print Program Map Table dump.
              -dumpdef: Hex-dump defective TS packets.
 -investigate_packets: If no CC packets are detected based on the PMT, try
                       to find data in all packets by scanning.

Teletext related options:
          -tpage page: Use this page for subtitles (if this parameter
                       is not used, try to autodetect). In Spain the
                       page is always 888, may vary in other countries.
            -tverbose: Enable verbose mode in the teletext decoder.

            -teletext: Force teletext mode even if teletext is not detected.
                       If used, you should also pass -datapid to specify
                       the stream ID you want to process.
          -noteletext: Disable teletext processing. This might be needed
                       for video streams that have both teletext packets
                       and CEA-608/708 packets (if teletext is processed
                       then CEA-608/708 processing is disabled).

Transcript customizing options:
    -customtxt format: Use the passed format to customize the (Timed) Transcript
                       output. The format must be like this: 1100100 (7 digits).
                       These indicate whether the next things should be displayed
                       or not in the (timed) transcript. They represent (in order):
                           - Display start time
                           - Display end time
                           - Display caption mode
                           - Display caption channel
                           - Use a relative timestamp ( relative to the sample)
                           - Display XDS info
                           - Use colors
                       Examples:
                       0000101 is the default setting for transcripts
                       1110101 is the default for timed transcripts
                       1111001 is the default setting for -ucla
                       Make sure you use this parameter after others that might
                       affect these settings (-out, -ucla, -xds, -txt, -ttxt, ...)

Communication with other programs and console output:
   --gui_mode_reports: Report progress and interesting events to stderr
                       in a easy to parse format. This is intended to be
                       used by other programs. See docs directory for.
                       details.
    --no_progress_bar: Suppress the output of the progress bar
               -quiet: Don't write any message.

Notes on the CEA-708 decoder: While it is starting to be useful, it's
a work in progress. A number of things don't work yet in the decoder
itself, and many of the auxiliary tools (case conversion to name one)
won't do anything yet. Feel free to submit samples that cause problems
and feature requests.

Notes on spupng output format:
One .xml file is created per output field. A set of .png files are created in
a directory with the same base name as the corresponding .xml file(s), but with
a .d extension. Each .png file will contain an image representing one caption
and named subNNNN.png, starting with sub0000.png.
For example, the command:
    ccextractor -out=spupng input.mpg
will create the files:
    input.xml
    input.d/sub0000.png
    input.d/sub0001.png
    ...
The command:
    ccextractor -out=spupng -o /tmp/output -12 input.mpg
will create the files:
    /tmp/output_1.xml
    /tmp/output_1.d/sub0000.png
    /tmp/output_1.d/sub0001.png
    ...
    /tmp/output_2.xml
    /tmp/output_2.d/sub0000.png
    /tmp/output_2.d/sub0001.png
    ...
Error: (This help screen was shown because there were no input files)