made sure dyn_back is only used for playing standalone PNG (no parent scene)
made sure dyn_back is only used for playing standalone PNG (no parent scene)

git-svn-id: ab66a9de07fa9d47c5829c82992f5279466c775f@3573 63c20433-aa62-49bd-875c-5a186b69a8fb

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