Use Mac OS X dictation on a file? In Mountain Lion, Mac OS X can use its dictation/voice recognition to turn your speaking into text.

Suppose I have an audio file of my voice speaking. Is there a way to use this dictation ability to turn that audio file into a text file?

I suppose the brute force solution would be to plug headphones into the audio port and hold them up to the microphone. Is there a more software-based solution more analogous to Unix pipes?
You can install Soundflower. It's a great utility that creates virtual input and output devices. So you could route QuickTime player, for example, as the input for the dictation.
http://cycling74.com/soundflower-landing-page/