span,zoom and zero options if
you wish, but not the others.
span=m sets the tv span manually (def: auto)
zero=m sets the tv zero manually (def: auto)
zoom=m sets the zoom display factor (def: 1.0)
sleep= sets the sleep time between exposures (def: 0 sec)
verbose - minimal printout.
debug - lots of printout; can be repeated for more.
watch option if the file
size or binning changes.
Also you cannot stop the program by hitting the X button on the window, you
must use Cntrl^C.