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Math Notermans
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Checking the default Lectora17 mediaplayer you find a tag called playbackRate in that file ( trivantis-mep.min.js )

“playbackRate:-1,defaultPlaybackRate:-1”

Because that is a minified javascript its quite hard to change anything inthere. You could get the mep.js from Mediaelement.com add/change things inthere and replace the trivantis-mep.min.js with that file.. should work..

Just downloaded both Mediaelement and the plugins i mentioned. There are definately some good samples inthere of working players with speedup/speeddown options. So standalone it works. Now get it working in Lectora 😉
Might give that a try this week…

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