I'm really sorry about necroing this thread but no other discussion even comes close to solving my problem. I was able to use the HTML provided to insert a YouTube video in an iFrame and when I view my InDesign document in the ePub Interactivity Preview window I am able to see and play the video. However, when I try to actually export to ePub, I get this error:
"HTML pageitem : 1 may fail epub validation"
and the resulting ePub document shows the black box for the ePub preview but nothing at all when viewing the actual page. I assumed that the ePub preview should show exactly what would be exported. Does anyone have any ideas as to what I did wrong?
Your question has nothing to do with DPS so I've moved it to the InDesign EPUB forum.
How are you viewing the EPUB?