The Xiaomi Yi also has some community and collections of simple startup scripts to modify the camera's capabilities simply by placing a file on the MicroSD card. For example: shooting 1600x1200(4:3) video, or adjusting noise reduction etc..
https://github.com/PJanisio/Xiaomi_Yi_autoexec
https://dashcamtalk.com/forum/forums/yi-action-camera.153/
http://fpvlab.com/forums/showthread.php?45118-Xiaomi-Yi-Enha...