libswscale/yuv2rgb.c:211: error: Uninitialized Value
  The value read from pa_2 was never initialized.

libswscale/yuv2rgb.c:211:5: 
209.     PUTRGBA(dst_1,py_1,pa_2,3,24);
210.     pa_1 += 8;\
211.     pa_2 += 8;\
         ^
212. ENDYUV2RGBLINE(8)
213.     LOADCHROMA(0);
