1.2.2 Captions (Prerecorded)
Provide alternatives for time-based media.

About

Providing captions for audio tracks enable people who have hearing disabilities to watch synchronizes media presentations and access the content of the audio.

Captions not only include dialogue, but identify who is speaking and include non-speech information conveyed through sound, including meaningful sound effects.

Example:

Before Rectification

Before Rectification

After Rectification

After Rectification