libswscale/output.c:1222: error: Uninitialized Value
  The value read from A was never initialized.

libswscale/output.c:1222:23: 
1220.             break;
1221.         case AV_PIX_FMT_ABGR:
1222.             dest[0] = hasAlpha ? A : 255;
                            ^
1223.             dest[1] = B >> 22;
1224.             dest[2] = G >> 22;
