libavformat/rmdec.c:496: error: Uninitialized Value
  The value read from len2 was never initialized.

libavformat/rmdec.c:496:9: 
494.     if((seq & 0x7F) == 1 || rm->curpic_num != pic_num){
495.         rm->slices = ((hdr & 0x3F) << 1) + 1;
496.         rm->videobufsize = len2 + 8*rm->slices + 1;
             ^
497.         av_free(rm->videobuf);
498.         if(!(rm->videobuf = av_malloc(rm->videobufsize)))
