Welcome to our community
Lord knows I've asked and asked for a Captivate decompiler until I look like a Na'vi by being blue in the face. But alas, there has never been one created. If you feel one should exist, you (as well as any others I could possibly recruit) should use the Wish Form to ask for it. Perhaps if enough of us ask, Adobe will finally relent and give us one.
Wish form link is in my sig...
Helpful and Handy Links
you could convert swf to html5 with these two tools
1.Google Swiffy from https://www.google.com/doubleclick/studio/swiffy/.
Swiffy converts Flash SWF files to HTML5, allowing you to reuse Flash content on devices without a Flash player (such as iPhones and iPads). Swiffy can't yet convert DoubleClick Studio creatives.
Swiffy currently supports a subset of SWF 8 and ActionScript 2.0.
2.SWF to HTML5 Movie Maker from http://www.htm5-movie-maker.com.
SWF to HTML5 Converter is equipped with powerful conversion features for flash users converting .swf animations to HTML5 videos. After uploading all the created HTML5 files to your website successfully, you can enjoy the HTML5 videos on laptop, desktop, or portable devices using popular browsers, such as Internet Explorer, Firefox, Google Chrome, Apple Safari, or Opera.