You need to add:
Code:
<meta property="media:duration">0:04:12.000</meta>
to your content.opf.
See "3.5.2 Media Overlays Metadata Vocabulary":
http://www.idpf.org/epub/30/spec/epu...ckage-metadata where it says:
Quote:
Description: The duration of the entire presentation or of a specific Media Overlay. The specified durations account for the audio clips known at authoring time, and so exclude live streaming from external resources and speech synthesis.
...
Cardinality: Exactly one for the Publication and for each Media Overlay.
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