cmdutils.c:810: error: Uninitialized Value
  The value read from type was never initialized.

cmdutils.c:810:21: 
808.             int i, index = strtol(spec, NULL, 0);
809.             for (i = 0; i < s->nb_streams; i++)
810.                 if (s->streams[i]->codec->codec_type == type && index-- == 0)
                         ^
811.                    return i == st->index;
812.             return 0;
