libavcodec/ffv1.c:1747: error: Uninitialized Value
  The value read from context_count was never initialized.

libavcodec/ffv1.c:1747:13: 
1745.                 av_freep(&p->vlc_state);
1746.             }
1747.             p->context_count = context_count;
                  ^
1748.         }
1749.     }
