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Diffstat (limited to 'doc/filters.texi')
| -rw-r--r-- | doc/filters.texi | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 9aedb01bb2..2863f8cf2a 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -753,7 +753,18 @@ using the libass library. To enable compilation of this filter you need to configure FFmpeg with @code{--enable-libass}. -This filter accepts in input the name of the ass file to render. +This filter accepts the syntax: @var{ass_filename}[:@var{options}], +where @var{ass_filename} is the filename of the ASS file to read, and +@var{options} is an optional sequence of @var{key}=@var{value} pairs, +separated by ":". + +A description of the accepted options follows. + +@table @option +@item dar +Specifies the display aspect ratio adopted for rendering the +subtitles. Default value is "1.0". +@end table For example, to render the file @file{sub.ass} on top of the input video, use the command: |