There's a good article in eSchool News from September 9, 2013, Creating videos for flipped learning. Educators are taking a second look at vodcasts, video on demand. There are many tools one can use to create video. One of the tools suggested to use for video creation is "aTube Catcher", Catch all of your favorite videos! This is freeware and will allow you to manage downloaded video and has other features that will be useful to the educator who is 'flipping'. aTube Catcher is said to work well with Prezi - The zooming presentation editor.
ScreenChomp is an app for the iPad that is a screen capture tool. There are other screen capture tools for the desktop or laptop and are referenced in the article noted above. These include Jing and Snagit.
If it is audio that you want, don't forget on a Mac, one can use Garageband and on a PC you can use Audacity to record audio. As a classroom teacher it was a nice way to create a welcome for students who entered class mid-year.
There are many videos that educators are creating and sharing. One collection I discovered recently is OpenEd. This site has a built in filtering search and claims to have the largest collection of standard aligned video.
These options will help you flip successfully whether you create your own video or use those available online. Check Educational Vodcasting - Flipping the Classroom for more information.
There are several Thinkfinity discussions and blog posts regarding flipped learning: