libavcodec/mpegvideo_enc.c:3253: error: Uninitialized Value
  The value read from run_tab[_] was never initialized.

libavcodec/mpegvideo_enc.c:3253:22: 
3251.     i -= last_run + 1;
3252. 
3253.     for(; i>start_i; i -= run_tab[i] + 1){
                           ^
3254.         block[ perm_scantable[i-1] ]= level_tab[i];
3255.     }
