mkphotorss reads standard-in, and writes standard-out. The input format it expects is: HEADING IMAGE+ Where HEADING are a series of key value pairs separated by a ':' (values may also contain unescaped ':' characters). The expected keys in a HEADING are: 'title', 'link', 'icon'. After the HEADING, any number of IMAGE definitions can appear. These are separated by the title of the image between '[' and ']'. After the tile should appear key-value pairs with keys 'url' and 'thumb'. Please see sample.input.