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Video captioning when the video contains text on screen

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From: Preast, Vanessa
Date: Sep 1, 2016 11:00AM

Could you direct me to resources that could help me address the following situation?

We have a video that is mostly like a PowerPoint presentation that has most of the spoken content already on the screen. However, sometimes the speaker says some stuff slightly differently.

What are the captioning requirements and recommendations at a WCAG 2.0 AA level when the video has text on screen, but no caption file, and the spoken text is mostly, but not always the same as what is already on the screen?

Do we need to add a caption file or transcript to the video?
If we do caption it, do we just write out the spoken content, or do we also include the written content (even when spoken and on-screen content are already the same)?

Thanks,
Vanessa