libcaca output from your OSX webcam

ffmpeg -f avfoundation -framerate 30 -s "640x480" -i "0" -c:v rawvideo -pix_fmt rgb24 -f caca -s "640x480" output4.mp4

brew install ffmpeg with options

brew install homebrew-ffmpeg/ffmpeg/ffmpeg --with-libcaca

convert to another format, resize withouth quality loss

ffmpeg -i vitrine.mp4 -vf scale=1024:-1 -q:vscale 0 vitrine.avi