VLCMediaPlayer: robustify video filter bindings
VLCMediaPlayer: robustify video filter bindings

simon1984/test,waterskier2007/VLCKit,kamcord/VLCKit,waterskier2007/VLCKit,i386/vlckit,hpsoar/VLCKit,siuying/VLCKit,larrytin/VLCKit,brion/VLCKit,siuying/VLCKit,programming086/VLCKit,CollabraMusic/VLCKit,kamcord/VLCKit,siuying/VLCKit,hpsoar/VLCKit,programming086/VLCKit,simon1984/test,simon1984/test,strukturag/VLCKit,kamcord/VLCKit,larrytin/VLCKit,strukturag/VLCKit,waterskier2007/VLCKit,CollabraMusic/VLCKit,CollabraMusic/VLCKit