http://<camera>/images/buffer.jpg?imagetype=<value>
http://mycam/images/buffer.jpg?imagetype=fullsize.jpg
buffer_start [-src SOURCEFILE] [-interval TIME]
[-duration TIME] [-store SIZE];
-src
fullsize.jpg
-interval
h<hours>m<minutes>s<seconds>
-duration
h<hours>m<minutes>s<seconds>
-duration inf
-store
halfsize.jpg
hugesize.jpg