What are the subtitle burn-in options and what do they mean?
Subtitle position: Determines the position of the subtitle on the horizontal and vertical axes.
Box color: The subtitle box makes the text easier to read. Subtitles are displayed inside a box equal to their own width. If the transparency value is 0% (Opaque), the images in the background do not show through the box.
Box transparency: Determines the transparency of the color used in the box. As the value moves toward 100%, transparency increases and the images in the video show through behind the box.
Text color: Determines the color of the text used inside the box.
Outline color: Becomes active if 'No box' is selected. The outline color is the color applied around the outer edges of the letters so that the subtitle is easier to read.
Outline width: Determines the width of the outline.
Text size: The subtitle size is determined automatically based on your video's resolution. The 'Small', 'Medium', 'Large', and 'Very large' options are based on multiples of the automatically determined value.
Margin (px): Determines the distance of the subtitles from the top or bottom edge of the video.
Related topics:
How do I add subtitles?
What should I pay attention to when creating and editing subtitles?
How do I burn subtitles into a video?