libavcodec/h264pred.c:280: error: Uninitialized Value
  The value read from t4 was never initialized.

libavcodec/h264pred.c:280:5: 
278.     src[3+0*stride]=
279.     src[2+2*stride]=(t3 + t4+ 1)>>1;
280.     src[3+2*stride]=(t4 + t5+ 1)>>1;
         ^
281.     src[0+1*stride]=(t0 + 2*t1 + t2 + 2)>>2;
282.     src[1+1*stride]=
