Closed captions not synced with audio

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Where ICT displays captions, the mechanism to display captions MUST preserve synchronization between the audio and the corresponding captions.


People who are deaf cannot hear the audio of multimedia (audio-video) content. In order to give people who cannot hear access to the information conveyed by the audio content, synchronized captions must be provided. The captions must include all essential dialogue, identify the speakers, and describe all essential sound effects. People who are deaf can read the captions while watching the video.

How to Fix

Fix this issue by ensuring that the video player has the ability to display closed captions so that they are synchronized to the following requirements:

a. Captions in recorded material: within 100 ms of the time stamp of the caption. b. Live captions: within 100 ms of the availability of the caption to the player.