libswscale/swscale.c:1258: error: Uninitialized Value
  The value read from A was never initialized.

libswscale/swscale.c:1258:23: 
1256.             dest[1] = G >> 22;
1257.             dest[2] = B >> 22;
1258.             dest[3] = hasAlpha ? A : 255;
                            ^
1259.             break;
1260.         case PIX_FMT_ABGR:
