libswscale/output.c:1205: error: Uninitialized Value
  The value read from A was never initialized.

libswscale/output.c:1205:23: 
1203.         switch(target) {
1204.         case AV_PIX_FMT_ARGB:
1205.             dest[0] = hasAlpha ? A : 255;
                            ^
1206.             dest[1] = R >> 22;
1207.             dest[2] = G >> 22;
