So after many trials and tribulations of figuring out how to record what was happening on my screen and turn that into a video, I admitted defeat and asked a friend to help me. She hooked me up with proper recording software and put this video together for me, on the proviso I don’t credit her by name as she despises MLP :D
 
The music (so make sure you unmute it) is Hall of the Mountain King, which is public domain:  

 
Fun facts:  
Sketching the image took about a minute, and vectoring it was about 25 minutes. Of course, parts were sped up to make the video short and sweet, and to fit under Derpibooru’s 25MB limit. In keeping with this pattern, it would presumably have taken me 25 years to figure out how to make this video myself :P
 
I used Open Broadcast Software Studio to record myself working on this. It’s 100% free to download and use, and I can’t recommend it enough. I believe she used Cyberlink Powerdirector to make the actual video and Hewbo Free Video Converter to make the webm :D
 
That horrifying cycloptic orb is Reference Ball, who presides over my works and provides the color scheme for my character. This one came from Rarity’s cloak :P