libswscale/yuv2rgb.c:181: error: Uninitialized Value
  The value read from pa_2 was never initialized.

libswscale/yuv2rgb.c:181:5: 
179.     PUTRGBA(dst_1,py_1,pa_2,3,0,24);
180.     pa_1 += 8;\
181.     pa_2 += 8;\
         ^
182. ENDYUV2RGBLINE(8)
183.     LOADCHROMA(0);
