libswscale/yuv2rgb.c:180: error: Uninitialized Value
  The value read from pa_1 was never initialized.

libswscale/yuv2rgb.c:180:5: 
178.     PUTRGBA(dst_2,py_2,pa_1,3,1,24);
179.     PUTRGBA(dst_1,py_1,pa_2,3,0,24);
180.     pa_1 += 8;\
         ^
181.     pa_2 += 8;\
182. ENDYUV2RGBLINE(8)
