libavformat/mpc8.c:119: error: Uninitialized Value
  The value read from ppos[_] was never initialized.

libavformat/mpc8.c:119:9: 
117.         if(t & 1)
118.             t = -(t & ~1);
119.         pos = (t >> 1) + ppos[0]*2 - ppos[1];
             ^
120.         av_add_index_entry(s->streams[0], pos, i << seekd, 0, 0, AVINDEX_KEYFRAME);
121.         ppos[1] = ppos[0];
