libswscale/swscale.c:1132: error: Uninitialized Value
  The value read from A2 was never initialized.

libswscale/swscale.c:1132:63: 
1130.             }
1131. 
1132.             yuv2rgb_write(dest, i, Y1, Y2, hasAlpha ? A1 : 0, hasAlpha ? A2 : 0,
                                                                    ^
1133.                           r, g, b, y, target, hasAlpha);
1134.         }

static av_always_inline void
yuv2rgb_1_c_template(SwsContext *c, const int16_t *buf0,
                     const int16_t *ubuf[2], const int16_t *vbuf[2],
                     const int16_t *abuf0, uint8_t *dest, int dstW,
                     int uvalpha, int y, enum PixelFormat target,
                     int hasAlpha)
{
    const int16_t *ubuf0 = ubuf[0], *ubuf1 = ubuf[1],
                  *vbuf0 = vbuf[0], *vbuf1 = vbuf[1];
    int i;
    if (uvalpha < 2048) {
        for (i = 0; i < (dstW >> 1); i++) {
            int Y1 = buf0[i * 2]     >> 7;
            int Y2 = buf0[i * 2 + 1] >> 7;
            int U  = ubuf1[i]        >> 7;
            int V  = vbuf1[i]        >> 7;
            int A1, A2;
            const void *r =  c->table_rV[V],
                       *g = (c->table_gU[U] + c->table_gV[V]),
                       *b =  c->table_bU[U];
            if (hasAlpha) {
                A1 = abuf0[i * 2    ] >> 7;
                A2 = abuf0[i * 2 + 1] >> 7;
            }
            yuv2rgb_write(dest, i, Y1, Y2, hasAlpha ? A1 : 0, hasAlpha ? A2 : 0,
                          r, g, b, y, target, hasAlpha);
        }
    } else {
        for (i = 0; i < (dstW >> 1); i++) {
            int Y1 =  buf0[i * 2]          >> 7;
            int Y2 =  buf0[i * 2 + 1]      >> 7;
            int U  = (ubuf0[i] + ubuf1[i]) >> 8;
            int V  = (vbuf0[i] + vbuf1[i]) >> 8;
            int A1, A2;
            const void *r =  c->table_rV[V],
                       *g = (c->table_gU[U] + c->table_gV[V]),
                       *b =  c->table_bU[U];
            if (hasAlpha) {
                A1 = abuf0[i * 2    ] >> 7;
                A2 = abuf0[i * 2 + 1] >> 7;
            }
            yuv2rgb_write(dest, i, Y1, Y2, hasAlpha ? A1 : 0, hasAlpha ? A2 : 0,
                          r, g, b, y, target, hasAlpha);
        }
    }
}
['static av_always_inline void\nyuv2rgb_1_c_template(SwsContext *c, const int16_t *buf0,\n                     const int16_t *ubuf[2], const int16_t *vbuf[2],\n                     const int16_t *abuf0, uint8_t *dest, int dstW,\n                     int uvalpha, int y, enum PixelFormat target,\n                     int hasAlpha)\n{\n    const int16_t *ubuf0 = ubuf[0], *ubuf1 = ubuf[1],\n                  *vbuf0 = vbuf[0], *vbuf1 = vbuf[1];\n    int i;\n    if (uvalpha < 2048) {\n        for (i = 0; i < (dstW >> 1); i++) {\n            int Y1 = buf0[i * 2]     >> 7;\n            int Y2 = buf0[i * 2 + 1] >> 7;\n            int U  = ubuf1[i]        >> 7;\n            int V  = vbuf1[i]        >> 7;\n            int A1, A2;\n            const void *r =  c->table_rV[V],\n                       *g = (c->table_gU[U] + c->table_gV[V]),\n                       *b =  c->table_bU[U];\n            if (hasAlpha) {\n                A1 = abuf0[i * 2    ] >> 7;\n                A2 = abuf0[i * 2 + 1] >> 7;\n            }\n            yuv2rgb_write(dest, i, Y1, Y2, hasAlpha ? A1 : 0, hasAlpha ? A2 : 0,\n                          r, g, b, y, target, hasAlpha);\n        }\n    } else {\n        for (i = 0; i < (dstW >> 1); i++) {\n            int Y1 =  buf0[i * 2]          >> 7;\n            int Y2 =  buf0[i * 2 + 1]      >> 7;\n            int U  = (ubuf0[i] + ubuf1[i]) >> 8;\n            int V  = (vbuf0[i] + vbuf1[i]) >> 8;\n            int A1, A2;\n            const void *r =  c->table_rV[V],\n                       *g = (c->table_gU[U] + c->table_gV[V]),\n                       *b =  c->table_bU[U];\n            if (hasAlpha) {\n                A1 = abuf0[i * 2    ] >> 7;\n                A2 = abuf0[i * 2 + 1] >> 7;\n            }\n            yuv2rgb_write(dest, i, Y1, Y2, hasAlpha ? A1 : 0, hasAlpha ? A2 : 0,\n                          r, g, b, y, target, hasAlpha);\n        }\n    }\n}']