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``--ass-line-spacing=<value>``
Set line spacing value for SSA/ASS renderer.
+``--ass-shaper=simple|complex``
+ Set the text layout engine used by libass.
+
+ :simple: uses Fribidi only, fast, doesn't render some languages correctly
+ :complex: uses HarfBuzz, slower, wider language support
+
+ ``complex`` is the default. If libass hasn't been compiled against HarfBuzz,
+ libass silently reverts to ``simple``.
+
``--ass-styles=<filename>``
Load all SSA/ASS styles found in the specified file and use them for
rendering text subtitles. The syntax of the file is exactly like the ``[V4