libavcodec/bmp.c:154: error: Uninitialized Value
  The value read from rgb[_] was never initialized.

libavcodec/bmp.c:154:30: 
152.             avctx->pix_fmt = PIX_FMT_RGB555;
153.         if(comp == BMP_BITFIELDS)
154.             avctx->pix_fmt = rgb[1] == 0x07E0 ? PIX_FMT_RGB565 : PIX_FMT_RGB555;
                                  ^
155.         break;
156.     case 8:
