avconv.c:833: error: Uninitialized Value
  The value read from out_filter was never initialized.

avconv.c:833:9: 
831. 
832.         inputs->name    = av_strdup("out");
833.         inputs->filter_ctx = out_filter;
             ^
834.         inputs->pad_idx = 0;
835.         inputs->next    = NULL;
