libavcodec/mpegvideo.c:872: error: Uninitialized Value
  The value read from yc_size was never initialized.

libavcodec/mpegvideo.c:872:25: 
870.             s->dc_val[1] = s->dc_val_base + y_size + s->mb_stride + 1;
871.             s->dc_val[2] = s->dc_val[1] + c_size;
872.             for (i = 0; i < yc_size; i++)
                             ^
873.                 s->dc_val_base[i] = 1024;
874.         }
