libswscale/yuv2rgb.c:278: error: Uninitialized Value
  The value read from pa_2 was never initialized.

libswscale/yuv2rgb.c:278:5: 
276.     PUTRGBA(dst_1, py_1, pa_2, 3, 24);
277.     pa_1 += 8;
278.     pa_2 += 8;
         ^
279. ENDYUV2RGBLINE(8, 0)
280.     LOADCHROMA(0);
