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sd_lavc: implement --sub-pos for bitmap subtitles

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Simple enough to do. May have mixed results. Typically, bitmap subtitles
will have a tight bounding box around the rendered text. But if for
example there is text on the top and bottom, it may be a single big
bitmap with a large transparent area between top and bottom. In
particular, DVD subtitles are really just a single screen-sized
RLE-encoded bitmap, though libavcodec will crop off transparent areas.

Like with sd_ass, you can't move subtitles _down_ if they are already in
their origin position. This could probably be improved, but I don't want
to deal with that right now.
This commit is contained in:
wm4
2019-05-22 23:15:34 +02:00
parent f06b3d7f88
commit 27c5550de2
2 changed files with 20 additions and 0 deletions
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DOCS/man/options.rst
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@@ -1990,6 +1990,9 @@ Subtitles
:strip: Radically strip all ASS tags and styles from the subtitle. This
is equivalent to the old ``--no-ass`` / ``--no-sub-ass`` options.
This also controls some bitmap subtitle overrides, as well as HTML tags in
formats like SRT, despite the name of the option.
``--sub-ass-force-margins``
Enables placing toptitles and subtitles in black borders when they are
available, if the subtitles are in the ASS format.