libswscale/swscale.c:1183: error: Uninitialized Value
  The value read from A2 was never initialized.

libswscale/swscale.c:1183:9: 
1181.         YSCALE_YUV_2_ANYRGB_C(YSCALE_YUV_2_RGB1_C)
1182.     } else {
1183.         YSCALE_YUV_2_ANYRGB_C(YSCALE_YUV_2_RGB1B_C)
              ^
1184.     }
1185. }

static void yuv2packed1_c(SwsContext *c, const uint16_t *buf0,
                          const uint16_t *ubuf0, const uint16_t *ubuf1,
                          const uint16_t *vbuf0, const uint16_t *vbuf1,
                          const uint16_t *abuf0, uint8_t *dest, int dstW,
                          int uvalpha, enum PixelFormat dstFormat,
                          int flags, int y)
{
    int i;
    if (uvalpha < 2048) {
        YSCALE_YUV_2_ANYRGB_C(YSCALE_YUV_2_RGB1_C)
    } else {
        YSCALE_YUV_2_ANYRGB_C(YSCALE_YUV_2_RGB1B_C)
    }
}
['static void yuv2packed1_c(SwsContext *c, const uint16_t *buf0,\n                          const uint16_t *ubuf0, const uint16_t *ubuf1,\n                          const uint16_t *vbuf0, const uint16_t *vbuf1,\n                          const uint16_t *abuf0, uint8_t *dest, int dstW,\n                          int uvalpha, enum PixelFormat dstFormat,\n                          int flags, int y)\n{\n    int i;\n    if (uvalpha < 2048) {\n        YSCALE_YUV_2_ANYRGB_C(YSCALE_YUV_2_RGB1_C)\n    } else {\n        YSCALE_YUV_2_ANYRGB_C(YSCALE_YUV_2_RGB1B_C)\n    }\n}']