attaching scene to compositor only if BIFS decoding went well
attaching scene to compositor only if BIFS decoding went well

DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf,DmitrySigaev/gpac-sf