Error replacing libmediaplayerservice.so in /system/lib?

I have task to check openmax plugin which is supported by stagefright framework but in firefly RK3288 target board, ffplayer is set by default so for that I downloaded android 4.4 source code and compiled it setting stagefright as default player and tried to replace libmediaplayerservice.so in /system/lib. But by doing so, board is not playing any video. Any help in this regard shall be highly appreciated.

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