libswscale/swscale.c:1083: error: Uninitialized Value
  The value read from A1 was never initialized.

libswscale/swscale.c:1083:46: 
1081.         }
1082. 
1083.         yuv2rgb_write(dest, i, Y1, Y2, U, V, hasAlpha ? A1 : 0, hasAlpha ? A2 : 0,
                                                   ^
1084.                       r, g, b, y, target, hasAlpha);
1085.     }
