Made sure MediaObject is unlink from its object manager before destroying the object 
Made sure MediaObject is unlink from its object manager before destroying the object 
DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf