Glossary
SDH Subtitles: What SDH Means and How It Differs from CC
SDH stands for Subtitles for the Deaf and Hard-of-hearing, a hybrid format that combines same-language subtitles with sound effect descriptions.
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Definition
SDH (Subtitles for the Deaf and Hard-of-hearing) is a hybrid caption format that combines same-language subtitles with descriptions of sound effects, music, and speaker identification.
Also known as: Subtitles for the Deaf and Hard-of-hearing
SDH, Explained
SDH stands for Subtitles for the Deaf and Hard-of-hearing. It is a hybrid format that emerged on DVD and Blu-ray and is now common on streaming services like Netflix and Disney+. SDH combines features of subtitles (timed text of spoken dialogue, usually in the same language as the audio) and closed captions (descriptions of music, sound effects, and speaker identification). SDH was designed because traditional closed captioning (the CC standard from U.S. broadcast television) requires specific decoder hardware to display, while SDH is encoded as standard text subtitles that any modern video player can render. As a result, SDH has become the de facto accessibility standard for streaming. A typical SDH line might read: '[ominous music swells] JOHN: We need to leave. Now.'
SDH Examples
- -Netflix's 'English [CC]' option, which is technically SDH.
- -A Blu-ray subtitle track labeled 'English SDH'.
Terms Related to SDH
SDH vs CC vs subtitles, side by side
Regular subtitles assume you can hear. They show what people say, often translated, and nothing else. Closed captions assume you cannot hear, so they add sound cues and speaker names, and they come from the TV world, which is why they often appear as white text on a black box. SDH sits between the two: it carries the same information as closed captions but looks like normal subtitles, which is why Blu-ray discs and streaming apps use it. If a menu offers English and English SDH, the SDH track is the one with [laughs], [tense music] and names like MAYA: before a line spoken off screen.
What goes into good SDH subtitles
Good SDH tells a viewer who cannot hear what a hearing viewer gets from the soundtrack, and nothing more. Describe sounds that matter to the story, like a knock before someone enters, and skip background noise that changes nothing. Put cues in square brackets and keep them short: [crowd cheering] beats a full sentence. Name the speaker only when it is not obvious who is talking. For music, say what it does rather than naming every track, such as [soft piano]. Keep each line on screen long enough to read, about three words per second, and never cover the speaker's mouth or on-screen text. Short-form creators can borrow the same habits in burned-in captions, adding a cue like [bell rings] where the sound is the joke.
What does SDH mean on Netflix?
SDH means subtitles for the deaf and hard of hearing. Picking an English SDH track on Netflix or Disney+ shows the dialogue plus sound cues like [door slams] or [upbeat music] and names speakers who are off screen.
What is the difference between SDH and CC?
Both describe sounds as well as speech. Closed captions come from TV broadcasting and are usually white text on a black box, often placed near the speaker. SDH uses the look of normal subtitles, so it works on players and discs that do not support closed captions.
Should I turn on SDH or regular subtitles?
Use SDH if you watch with the sound off or low, or if you are deaf or hard of hearing, because it tells you about music, laughter and noises. Use regular subtitles if you can hear the audio and only need the words, for example in a foreign-language film.
How do I make SDH subtitles for my video?
Start from an accurate transcript, then add sound cues in square brackets, like [phone buzzing], and speaker names when the speaker is off screen. Keep lines short and timed to the audio, and export as SRT or VTT for YouTube or your player.
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