libswscale/output.c:1333: error: Uninitialized Value
  The value read from A was never initialized.

libswscale/output.c:1333:17: 
1331.             dest16[2][i] = R >> SH;
1332.             if (hasAlpha)
1333.                 dest16[3][i] = A;
                      ^
1334.         } else {
1335.             dest[0][i] = G >> 22;
