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| author | Marton Balint <cus@passwd.hu> | 2013-09-01 23:05:50 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2013-09-02 01:19:52 +0200 |
| commit | b339dccbba877eb00c4cac2b2761c07f9ba064e6 (patch) | |
| tree | aed52ecdc22cf3c04abe46c86251d8aecd305fb8 /doc/decoders.texi | |
| parent | cf942994489210c9509ae811cd4fc0515c872f09 (diff) | |
| download | ffmpeg-b339dccbba877eb00c4cac2b2761c07f9ba064e6.tar.gz | |
lavc: add teletext decoder using libzvbi
Based on a patch by Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>.
http://lists.ffmpeg.org/pipermail/ffmpeg-devel/2012-December/136677.html
The original patch was rebased by Tudor SUCIU <tudor.suciu@gmail.com>.
Lots of additional features and fixes are made by me.
Fixes ticket #2086.
Changes since last version:
- change default page to all pages
Signed-off-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'doc/decoders.texi')
| -rw-r--r-- | doc/decoders.texi | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/doc/decoders.texi b/doc/decoders.texi index aa82add080..9d9f298471 100644 --- a/doc/decoders.texi +++ b/doc/decoders.texi @@ -158,4 +158,45 @@ ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b, 0d617a, 7b7b7b, d1d1d1, 7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b}. @end table +@section libzvbi-teletext + +Libzvbi allows libavcodec to decode DVB teletext pages and DVB teletext +subtitles. Requires the presence of the libzvbi headers and library during +configuration. You need to explicitly configure the build with +@code{--enable-libzvbi}. + +@subsection Options + +@table @option +@item txt_page +List of teletext page numbers to decode. You may use the special * string to +match all pages. Pages that do not match the specified list are dropped. +Default value is *. +@item txt_chop_top +Discards the top teletext line. Default value is 1. +@item txt_format +Specifies the format of the decoded subtitles. The teletext decoder is capable +of decoding the teletext pages to bitmaps or to simple text, you should use +"bitmap" for teletext pages, because certain graphics and colors cannot be +expressed in simple text. You might use "text" for teletext based subtitles if +your application can handle simple text based subtitles. Default value is +bitmap. +@item txt_left +X offset of generated bitmaps, default is 0. +@item txt_top +Y offset of generated bitmaps, default is 0. +@item txt_chop_spaces +Chops leading and trailing spaces and removes empty lines from the generated +text. This option is useful for teletext based subtitles where empty spaces may +be present at the start or at the end of the lines or empty lines may be +present between the subtitle lines because of double-sized teletext charactes. +Default value is 1. +@item txt_duration +Sets the display duration of the decoded teletext pages or subtitles in +miliseconds. Default value is 30000 which is 30 seconds. +@item txt_transparent +Force transparent background of the generated teletext bitmaps. Default value +is 0 which means an opaque (black) background. +@end table + @c man end SUBTILES DECODERS |