Apple TV 4K provides Closed Captions and SDH under Accessibility > Subtitles and Captioning. Style controls change the supported caption presentation. You still need an available caption track and an app that applies the relevant preference.
Establish the required caption function
Decide whether the viewer needs same-language captions with sound information, a translation or another available track. Record the programme and edition used for the check. A CC or SDH indication can help identify an available feature, but a preference cannot supply captions to a video that has none. Use the actual player’s track list as a separate observation.
Set the native preference and preview
Use the Apple TV Settings route for the installed tvOS version. Keep the old style or take a private note of it before editing. Choose a readable result at normal viewing distance rather than making a close-up screenshot the acceptance test.
- Open Settings, Accessibility, then Subtitles and Captioning.
- Enable Closed Captions and SDH when that is the desired preference.
- Open Style and choose a supplied style or edit an applicable style.
- Compare font size, foreground and background in the preview, changing one property at a time.
Verify the caption that the programme actually uses
Choose a permitted programme with a listed track. Compare the same caption moment in the same player at the normal viewing distance. Record the app edition and selected track with the preview result.
Text drawn into the picture keeps its original appearance. Investigate missing tracks, character encoding and timing through their separate checks.
| Result | Next question |
|---|---|
| Preview changed; one app unchanged | Does that app use native style preferences for this track? |
| One supported track changes; another does not | Are the track formats or renderers different? |
| Text is absent from the track list | Is the required caption version actually available? |
| Text is clipped after TV zoom | Restore geometry, then investigate caption rendering. |
Use a practical readability check
Check a scene with short and long lines, relevant sound cues and a clear background change. Verify that the text is not cropped and that player overlays do not hide essential words. The expected outcome is a readable supported caption track on the intended screen. Retain any unverified app or programme requirements for the trial instead of claiming that every title now follows the chosen style.