dashcast: improve arg parser robustness
dashcast: improve arg parser robustness

git-svn-id: ab66a9de07fa9d47c5829c82992f5279466c775f@4781 63c20433-aa62-49bd-875c-5a186b69a8fb

drakeguan/gpac,vladimir-kazakov/gpac,RodolpheFouquet/gpac,psteinb/gpac,epam/gpac,vladimir-kazakov/gpac,nguyen-viet-thanh-trung/gpac,epam/gpac,drakeguan/gpac,gpac/gpac,aymanelyaagoubi/gpac,aymanelyaagoubi/gpac,canatella/gpac,emmanouil/gpac,DmitrySigaev/gpac,porcelijn/gpac,rauf/gpac,rbouqueau/gpac,ARSekkat/gpac,psteinb/gpac,vladimir-kazakov/gpac,Bevara/Access-open,rbouqueau/gpac_brew_travis,vladimir-kazakov/gpac,rbouqueau/gpac,drakeguan/gpac,rauf/gpac,ARSekkat/gpac,rbouqueau/gpac,DmitrySigaev/gpac,rbouqueau/gpac_brew_travis,rbouqueau/gpac,psteinb/gpac,porcelijn/gpac,rauf/gpac,rbouqueau/gpac_brew_travis,aymanelyaagoubi/gpac,epam/gpac,canatella/gpac,Bevara/Access-open,porcelijn/gpac,ARSekkat/gpac,emmanouil/gpac,Bevara/Access-open,RodolpheFouquet/gpac,epam/gpac,gpac/gpac,epam/gpac,nguyen-viet-thanh-trung/gpac,RodolpheFouquet/gpac,epam/gpac,nguyen-viet-thanh-trung/gpac,Bevara/Access-open,rbouqueau/gpac_brew_travis,porcelijn/gpac,Bevara/Access-open,drakeguan/gpac,vladimir-kazakov/gpac,rauf/gpac,emmanouil/gpac,rbouqueau/gpac,DmitrySigaev/gpac,DmitrySigaev/gpac,rbouqueau/gpac_brew_travis,ARSekkat/gpac,psteinb/gpac,canatella/gpac,canatella/gpac,nguyen-viet-thanh-trung/gpac,nguyen-viet-thanh-trung/gpac,canatella/gpac,porcelijn/gpac,RodolpheFouquet/gpac,canatella/gpac,ARSekkat/gpac,RodolpheFouquet/gpac,Bevara/Access-open,emmanouil/gpac,aymanelyaagoubi/gpac,rbouqueau/gpac,vladimir-kazakov/gpac,psteinb/gpac,gpac/gpac,ARSekkat/gpac,RodolpheFouquet/gpac,gpac/gpac,gpac/gpac,rauf/gpac,aymanelyaagoubi/gpac,gpac/gpac,emmanouil/gpac,rbouqueau/gpac,DmitrySigaev/gpac,rbouqueau/gpac_brew_travis,rbouqueau/gpac,aymanelyaagoubi/gpac,DmitrySigaev/gpac,gpac/gpac,nguyen-viet-thanh-trung/gpac,drakeguan/gpac,psteinb/gpac,porcelijn/gpac,emmanouil/gpac,drakeguan/gpac,gpac/gpac,canatella/gpac,rauf/gpac