Fixed potential crash for bitmap subtitle streams
Fixed potential crash for bitmap subtitle streams

firefly2442/sfeMovie,firefly2442/sfeMovie,firefly2442/sfeMovie,Yalir/sfeMovie,Yalir/sfeMovie,firefly2442/sfeMovie,Yalir/sfeMovie,firefly2442/sfeMovie,Yalir/sfeMovie,Yalir/sfeMovie,Yalir/sfeMovie,firefly2442/sfeMovie