libswscale/swscale.c:1115: error: Uninitialized Value
  The value read from A1 was never initialized.

libswscale/swscale.c:1115:50: 
1113.             }
1114. 
1115.             yuv2rgb_write(dest, i, Y1, Y2, U, V, hasAlpha ? A1 : 0, hasAlpha ? A2 : 0,
                                                       ^
1116.                           r, g, b, y, target, hasAlpha);
1117.         }
