Thread: Embedding audio/video in epub files
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Old 10-10-2022, 10:31 AM   #42
KevinH
Sigil Developer
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Could be.

But technically, video tags are not allowed in epub2 according to the official spec. Both calibre and Sigil supported it under epub2 as extensions. I assume iBooks did the same. Full support for a limited set of video formats (and even using external video resources) was not added to the spec officially until epub3.

So support under epub2 is very spotty at best by many e-readers. Most real epub3 readers should now support it.
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