video2picture
mplayer –vo png videname.avi
picture2video
ffmpeg -f image2 -i image%d.jpg video.mpg
convert *.jpg movie.mpgmencoder mf://*.jpg -mf fps=20:type=jpg -o output.avi -ovc lavc
video2video
ffmpeg -i input.avi -s 640x480 -b 5000k output.avi; % resize the input avi file to 640x480 with 5000k biterate
pciture2picture using ImageMagick
mogrify -resize 25% *.jpg
mogrify -format png *.jpg
convert rose.jpg -resize 50% rose.png