libavformat/rmdec.c:507: error: Uninitialized Value
  The value read from len2 was never initialized.

libavformat/rmdec.c:507:13: 
505.     if(type&1){     // frame, not slice
506.         if(type == 3)  // frame as a part of packet
507.             len= len2;
                 ^
508.         if(rm->remaining_len < len)
509.             return -1;
