Subtitles generally provide dialogue text only—there is no text description of sounds
that may also be part of a scene (although those could be added if you wish). Subtitles
are generally intended to provide the dialogue in a second language and assume you
can hear the disc’s audio.
When creating subtitles, you can define their position, size, font, and color. Subtitles do
not actually have to be text—they can be a graphic used to display a logo or point out
an item in the video.
All DVD players, including those used by computers, include the ability to show subtitles.
Subtitles work the same in both NTSC and PAL projects.