ffmpeg yuv to jpeg and jpeg to yuv

ffmpeg is a swiss army knife for multimedia folk..I will be updating these for different cases:

YUV to JPEG

ffmpeg -s 640x480 -pix_fmt yuv420p -i test-yuv420p.yuv test-640x480.jpg
ffmpeg -s 640x480 -pix_fmt uyvy422 -i test-yuv422uyvy.yuv test-640x480.jpg

JPEG -> YUV

ffmpeg -i test-640x480.jpg -s 640x480 -pix_fmt yuv420p test-yuv420p.yuv