Our daughter snagged some tchotchkes from a high-school career fair, including one that she instantly recognized as a flamethrower: Antibacterial Hand Sanitizer Spray, 62% Ethyl Alcohol plus some other junk, in a handy pump-spray container. Heck, it even says
Warnings Flammable. Keep away from open flame. Keep out of reach of children.
I was so proud of her…
After homework, she stuck a candle atop the garbage can by the garage and fired off a few shots while I ran the camera. Here’s the best one, converted to a low-speed animated GIF.
We’re pretty sure that’s Sweet Babby Jeebus™ in the next-to-last frame of the flare. Maybe Madonna. Could go either way.
Much as with the “movies” I made for trebuchets and tree frogs, I used ffmpeg to shred the camera’s mpg movie into separate jpg images, some bash to select the frames, then convert to stitch them back together into a gif.
The general outline:
mkdir Frames
ffmpeg -i mov04990.mpg -f image2 Frames/frame-%03d.jpg
cd Frames
mkdir flare3
for f in `seq 760 780` ; do cp frame-${f}.jpg flare3 ; done
cd flare3
convert -delay 50 frame-* Flare3.gif
If my bash-fu was stronger, I could feed the proper file names directly into convert without the copy step.
Now, kids, don’t try this at home. At least not without responsible adult supervision…
The Smell of Molten Projects in the Morning 