Your browser is not able to handle "frames". The "frame" would have divided the page into two columns. One column would have had an example of captioned video playing in it and the text below.
Web Captioning or Internet captioning is text that follows the images or animation. One popular way is with a "Synchronized Multimedia Integration Language (SMIL) file.
Webmasters use SMIL files as part of complicated pages -- like this one. SMIL caption files are actually simple HTML files but they contain lots of tedious timing information.
AutoCaption will generate SMIL files at a click of a button. No new techniques
or software packages to learn. You work the same way you do for closed captioning
or subtitling. The only difference is the output format you select -- AutoCaption
does the rest.
Firefox (Mozilla) users: SMIL support is part of the SVG project. Alas the
SVG project is still in progress (click here
for details) so as of this writing you will see just a list of captions without any
video on the left.