libswscale/yuv2rgb.c:792: error: Uninitialized Value
  The value read from abase was never initialized.

libswscale/yuv2rgb.c:792:52: 
790.         for (i = 0; i < 1024; i++) {
791.             unsigned yval = av_clip_uint8((yb + 0x8000) >> 16);
792.             y_table32[i     ] = (yval << rbase) + (needAlpha ? 0 : (255u << abase));
                                                        ^
793.             y_table32[i+1024] = yval << gbase;
794.             y_table32[i+2048] = yval << bbase;
