Loop YouTube Video in Cascade Story Map Intro

[TonyViveiros1]

I'm trying to include only a specific portion of a youtube video as the cover or intro of my cascade story map.  I would only like the first 17 seconds of the video to play and have this autoplay & loop as well.  I've tried what's been suggested here by editing the original JSON code and creating the code below within ArcGIS Online Assistant.  However, the video loops only once (it plays in its entirety after the first loop) and audio is also present now (wasn't the case when I originally tried linking to the video from the cascade story map template).  Any suggestions on how to remove the audio and get the cascade intro video to loop from 1-17 seconds endlessly?