libswscale/yuv2rgb.c:239: error: Uninitialized Value
  The value read from pa_2 was never initialized.

libswscale/yuv2rgb.c:239:5: 
237.     PUTRGBA(dst_1,py_1,pa_1,3,0);
238.     pa_1 += 8;\
239.     pa_2 += 8;\
         ^
240. ENDYUV2RGBLINE(8)
241.     LOADCHROMA(0);
