Guide to options
Most options should be self explanatory:

In "Video Format", if you have a 3D video and want the result to be 3D, choose whichever 3D format you have. If you have a 2D video (or want to convert a 3D video to 2D?), choose "2D".

In "Quality", lower is better. 1 is the best quality and 31 is the worst.

Notes
32-bit FFmpeg is included. Feel free to replace with 64-bit version from here: http://ffmpeg.zeranoe.com/builds/ (shouldn't affect program, but should probably make conversion a bit faster on 64-bit CPUs)

I think I have included all the necessary licenses etc (and possibly a bunch of extras to prevent the risk of not supplying all necessary ones) - if you notice anything missing, let me know so I can add it.

It may look like the app is doing nothing for a while after popping up with a message "Converting. Please wait!" - this is OK, that's meant to happen. Eventually it'll pop up and say "Done!".

Also note: There is a bug in the first release that means video file names won't be quite right. I hope to fix this soon, but in mean time, please just rename converted videos appropriately. (Sorry for inconvenience)

Changelog:
-=v0.30=-
Added mirrored input option
Added option for 480x240 resolution (default is still 400x240)

-=v0.23=-
More bug fixes
Remembers video folder
Source tidied up a bit