libavcodec/bmp.c:170: error: Uninitialized Value
  The value read from rgb[_] was never initialized.

libavcodec/bmp.c:170:42: 
168.             else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F)
169.                avctx->pix_fmt = PIX_FMT_RGB555;
170.             else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F)
                                              ^
171.                avctx->pix_fmt = PIX_FMT_RGB444;
172.             else {
