SecondarySubtitlePlacement
Where the second subtitle track sits on the picture (#494).
Above or below the primary, the two tracks share one bottom stack, so the secondary moves down to the bottom while the primary shows nothing, as a second speaker's line does. A primary line its author placed elsewhere keeps its place. While the libass typesetter draws the primary, the secondary keeps to the top, because the stack cannot see the typeset lines. Picture subtitles keep the place their pictures carry.
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Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
Returns an array containing the constants of this enum type, in the order they're declared.