Thread: Adding multiple media overlays with EPUB3 ?
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Old 10-04-2021, 02:25 PM   #4
KevinH
Sigil Developer
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The latest spec only allows 0 or 1 audio elements per par.

See: https://www.w3.org/publishing/epub3/...-smil-par-elem

Quote:
2.4.6 The par Element

The par element contains media objects which are to be rendered in parallel.

Element Name
par

Usage
One or more par elements MAY occur as children of the body and seq elements.

Attributes
epub:type [optional]
An expression of the structural semantics of the corresponding element in the EPUB Content Document.

The value is a white space separated list of property [Packages32] types. Refer to Semantic Inflection for more information.

id [optional]
The ID [XML] of the element, which MUST be unique within the document scope.

Content Model
In any order:

text [exactly 1]

audio [0 or 1]

The audio element is OPTIONAL only if its sibling text element refers to audio or video media (see Embedded Media), or to textual content intended for rendering via Text-to-Speech (TTS).

Have you thought about creating an epub with multiple renditions? Would that help?
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