Extracting closed captions and teletext using directshow

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Hi,

I'm trying to write a c# program that extracts and dumps (not decode) teletext and closed caption data from a video stream into a hex file.

I came across this - apparently directshow has support for teletext and closed captions.

http://msdn.microsoft.com/en-us/library/windows/desktop/dd374627(v=vs.85).aspx[^]

but I can't seem to figure out how to write a simple app that "extracts" the data and dumps it into a hex file.

Anyone can help me with a sample code to get started?

Thanks,

Posted 4-Nov-13 3:19am

RBoy

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Sergey Alexandrovich Kryukov 4-Nov-13 9:45am

At this moment, your links shows "not found" response, please check it up.
—SA

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Maxim Kartavenkov · Answer 1 · 2013-11-07T00:10:00

Hello,

The closed captions can be stored as separate stream in the media file container, or embedded into video stream.
In case of separate stream it can be the well known format for the stream (example "text"), or user defined. All that things is described in the container format. (examples: MPEG4, MPEG-TS)
Closed captions embedded into video stream mostly have documented format, and can easy extracted (example H264, MPEG2).

The documentation you should look:
ISO 13818-1/ITU-T rec H.222
ISO 13818-2/ITU-T rec H.262
ISO 14496-10/ITU-T rec H.264

The Tools you may use:
CCExtractor - an open source C++ Closed Captions Extractor.
MPEG-2 TS Analizer - you can determine the streams in a file their PID's and other data.

Regards,
Maxim.