doc/protocols: simplify and clarify UDP localaddr option

[ffmpeg] / doc / decoders.texi

diff --git a/doc/decoders.texi b/doc/decoders.texi
index a9510bdf02d198ca43a49c1a04f1a9211d87daea..25187e30f1c621478cdcb82028dc24d213a8786a 100644 (file)
--- a/doc/decoders.texi
+++ b/doc/decoders.texi
@@ -47,6 +47,12 @@ top-field-first is assumed
 
 @end table
 
+@section libdavs2
+
+AVS2-P2/IEEE1857.4 video decoder wrapper.
+
+This decoder allows libavcodec to decode AVS2 streams with davs2 library.
+
 @c man end VIDEO DECODERS
 
 @chapter Audio Decoders
@@ -248,18 +254,25 @@ configuration. You need to explicitly configure the build with
 
 @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.
+List of teletext page numbers to decode. Pages that do not match the specified
+list are dropped. You may use the special @code{*} string to match all pages,
+or @code{subtitle} to match all subtitle pages.
 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.
+Specifies the format of the decoded subtitles.
+@table @option
+@item bitmap
+The default format, you should use this for teletext pages, because certain
+graphics and colors cannot be expressed in simple text or even ASS.
+@item text
+Simple text based output without formatting.
+@item ass
+Formatted ASS output, subtitle pages and teletext pages are returned in
+different styles, subtitle pages are stripped down to text, but an effort is
+made to keep the text alignment and the formatting.
+@end table
 @item txt_left
 X offset of generated bitmaps, default is 0.
 @item txt_top
@@ -272,7 +285,8 @@ 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.