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doc/encoders: Document "dvdsub workaround for some players" 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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Oliver Fromme 2014-07-10 19:41:08 +02:00 committed by Michael Niedermayer
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@ -2147,3 +2147,27 @@ For the fastest encoding speed set the @option{qscale} parameter (4 is the
recommended value) and do not set a size constraint.
@c man end VIDEO ENCODERS
@chapter Subtitles Encoders
@c man begin SUBTITLES ENCODERS
@section dvdsub
This codec encodes the bitmap subtitle format that is used in DVDs.
Typically they are stored in VOBSUB file pairs (*.idx + *.sub),
and they can also be used in Matroska files.
@subsection Options
@table @option
@item even_rows_fix
When set to 1, enable a work-around that makes the number of pixel rows
even in all subtitles. This fixes a problem with some players that
cut off the bottom row if the number is odd. The work-around just adds
a fully transparent row if needed. The overhead is low, typically
one byte per subtitle on average.
By default, this work-around is disabled.
@end table
@c man end SUBTITLES ENCODERS