fix tring handling
fix tring handling

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