Subtitling is the creation of subtitles for various types of audiovisual media - films, TV shows, advertisements, YouTube videos...
If you're producing AV content which includes spoken language, you might want to consider adding subtitles, even if English is the only language being spoken in it. This will make your content accessible to the deaf and to those hard of hearing and thus broaden your potential audience.
If there is a lot or only very little speaking in your video, the price may vary. The average amount of words spoken is between 120 to 150 words per minute.
I'd love to play the part of the subtitler in your production! If you agree and think I'd be a good fit, let me know!