libavformat/mpc8.c:121: error: Uninitialized Value
  The value read from ppos[_] was never initialized.

libavformat/mpc8.c:121:9: 
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];
             ^
122.         ppos[0] = pos;
123.     }
