Text capture: Difference between revisions
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The PAL standard uses teletext, while the NTSC standard uses closed captioning. |
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The various television capture chips implement these technologies in different ways. |
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* [[alevtv]] |
* [[alevtv]] |
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* [[ntsc-cc]] |
* [[ntsc-cc]] |
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* tvtime |
* [[tvtime]] |
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** [[teletext]] |
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* [[zvbi]] |
* [[zvbi]] |
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===ntsc-cc=== |
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The application ntsc-cc handles closed captioning on bttv cards. For ntsc-cc to work, you typically need to be running an application for viewing or recording television, such as xawtv and mencoder. If no such application is running, ntsc-cc tends to produce garbled output. |
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tvtime has built-in support for closed captioning for bttv and saa7134 cards (also other?). |
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In early 2004, Kevin Ko wrote a [http://www.princeton.edu/~kko/tvtime/vbi_lock_0.2.patch patch with useful comments] to tvtime's vbidata.c; see [http://www.princeton.edu/~kko/tvtime/ his detailed account]. |
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===Unsupported cards=== |
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There is currently no code supporting closed captioning on cx88 cards. |
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Revision as of 06:45, 22 April 2005
The PAL standard uses teletext, while the NTSC standard uses closed captioning. The various television capture chips implement these technologies in different ways.
Applications
ntsc-cc
The application ntsc-cc handles closed captioning on bttv cards. For ntsc-cc to work, you typically need to be running an application for viewing or recording television, such as xawtv and mencoder. If no such application is running, ntsc-cc tends to produce garbled output.
tvtime support for closed captioning
tvtime has built-in support for closed captioning for bttv and saa7134 cards (also other?).
In early 2004, Kevin Ko wrote a patch with useful comments to tvtime's vbidata.c; see his detailed account.
Unsupported cards
There is currently no code supporting closed captioning on cx88 cards.