libavcodec/ffv1.c:1743: error: Uninitialized Value
  The value read from context_count was never initialized.

libavcodec/ffv1.c:1743:17: 
1741.             }
1742. 
1743.             if (p->context_count < context_count) {
                      ^
1744.                 av_freep(&p->state);
1745.                 av_freep(&p->vlc_state);
