Start with the purpose of the track
W3C distinguishes captions that communicate speech and relevant non-speech audio from subtitles translating spoken language. Terminology varies by region, so read the track labels and the service’s description rather than relying on one word alone.
A limited or forced-text presentation can contain only selected lines. Its silence through most of a programme does not necessarily mean that a full caption track is broken.
Compare the selected language and type
Open the player’s supported audio/text controls and record the selected track. The interface language does not always determine the programme’s audio or captions. A device set to English can still play a different available track.
If several tracks exist, compare them on a passage where their purpose is clear. Do not assume that an audio language guarantees a matching text track or that every episode offers the same options.
Separate absence from presentation
If text exists but is cropped, too small or poorly contrasted, investigate display sizing and the player’s supported caption presentation. If no relevant track is supplied, changing font size cannot create one.
Open captions can be part of the picture itself and may not have a player switch. Closed text tracks normally depend on player support and availability. Do not promise that every source lets viewers remove or restyle all text.
Report the exact missing information
Name the programme, episode, selected language and track label. State whether spoken dialogue, sound descriptions or occasional foreign-language lines are missing. That is a clearer request than “subtitles do not work”.
Keep accessibility needs part of the enquiry before choosing a service or player. A general compatibility statement is not evidence that the particular captions or language options you need are available for every item.
Questions about this guide
Does setting the app to English guarantee English captions?
No. Interface language and available programme tracks are separate settings and facts.
Why does one text track appear only occasionally?
It may be intended for selected dialogue or other limited text. Check its label and purpose before assuming that it is a complete caption track.