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An app is usually a better solution as iOS, Mac, Android, Windows or Linux is needed anyway to have video + audio. There are free frameworks and once it's done once the next time is easy. Almost everyone would have to download an App even if epub3 did what what you want.
People have been making multimedia since 1980s and commonly from 1990s. The idea of epub3 competing with multimedia apps and HTML5 websites was a crazy design decision.
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