avconv.c:828: error: Uninitialized Value
  The value read from in_filter was never initialized.

avconv.c:828:9: 
826. 
827.         outputs->name    = av_strdup("in");
828.         outputs->filter_ctx = in_filter;
             ^
829.         outputs->pad_idx = 0;
830.         outputs->next    = NULL;
