libswscale/yuv2rgb.c:701: error: Uninitialized Value
  The value read from abase was never initialized.

libswscale/yuv2rgb.c:701:52: 
699.         for (i = 0; i < 1024; i++) {
700.             uint8_t yval = av_clip_uint8((yb + 0x8000) >> 16);
701.             y_table32[i     ] = (yval << rbase) + (needAlpha ? 0 : (255 << abase));
                                                        ^
702.             y_table32[i+1024] = yval << gbase;
703.             y_table32[i+2048] = yval << bbase;
