1 person found this helpful
Epub is the format you’d use for iBooks and other eReaders. Not all of them have full support for advanced features such as video and audio however and I will also warn you that the term “easily” can mean different things to different people. The chances of you creating epub that requires no editing of HTML and CSS is slim and none.
You can do so for the iBookstore (iPhone, iPad, iPod Touch) but I don't think it's possible on the "Android Store" ... is there such a thing? I thought it was an Android App Store and I don't think they sell eBooks ... only Apps. I know that Amazon is not accepting ebooks with audio/video from individual authors or indie publishers. I believe the same is true of B&N (Nook ereaders).
I'd recommend getting Liz Castro's mini-guide ebook, "Audio and Video in EPUB" -- she comes at it from a hand-coding way, expressly for iBooks.
So no, it's not necessary to use DPS to create rich media eBooks. Why not browse the iBookstore and look for "enhanced" ebooks to see what can be possible?
Oh and btw, InDesign can't export to EPUB3 (as you mentioned in your post at the top). So far all the eReader devices only support EPUB2.01, anyway. Apple has enabled add'l support for tags, mark-up, and assets beyond the EPUB2 spec in its current crop of devices.