alignment property
If no explicit xPosition or yPosition is provided, setting alignment to centered will place the captions at the bottom center of the output. Similarly, setting a left alignment will align captions to the bottom left of the output. If x and y positions are given in conjunction with the alignment parameter, the font will be justified (either left or centered) relative to those coordinates. Selecting "smart" justification will left-justify live subtitles and center-justify pre-recorded subtitles. All burn-in and DVB-Sub font settings must match.
Implementation
final BurnInAlignment? alignment;