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avcodec/libzvbi-teletextdec: allow -1 subtitle duration and make it the default

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Most decoders (pgssubdec, ccaption_dec) are using -1 or UINT32_MAX for a
subtitle event which should be cleared at the next event.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint
2018-04-28 19:17:31 +02:00
parent 652ba72ed3
commit 03038d4da9
3 changed files with 4 additions and 3 deletions
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3
doc/decoders.texi
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@@ -272,7 +272,8 @@ present between the subtitle lines because of double-sized teletext characters.
Default value is 1.
@item txt_duration
Sets the display duration of the decoded teletext pages or subtitles in
milliseconds. Default value is 30000 which is 30 seconds.
milliseconds. Default value is -1 which means infinity or until the next
subtitle event comes.
@item txt_transparent
Force transparent background of the generated teletext bitmaps. Default value
is 0 which means an opaque background.