libavformat/rmdec.c:788: error: Uninitialized Value
  The value read from pos was never initialized.

libavformat/rmdec.c:788:17: 
786.                                       &seq, &flags, &timestamp);
787.             if((old_flags&2) && (seq&0x7F) == 1)
788.                 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
                     ^
789.             if (res)
790.                 continue;
