The King's orders are absolute
I'm not really that up to date as a lot of Let's Players are. What I've done with the majority of my LPs is used NES and SNES emulators with built in recording functions. I use Audacity to record my commentary while I have the emulator set to record the gameplay footage. After I finish recording, I replay the movie while having the emulator convert the movie into AVI files that I edit with my commentary in a movie maker program. It's kind of a "poor man's recording set up" as I'm not presently equipped with a particularly powerful PC or higher end capture devices like Hauppauge or Elgato.
Here's the video I watched that showed me how to record using an SNES emulator with built in recording functions: https://www.youtube.com/watch?v=FsK2X2KvYEw
I hope you found that helpful. And I'm glad you enjoyed my video, I've got the entirety of my Chrono Trigger LP up on YouTube now, including the New Game + endings. Thanks for watching!