libavcodec/clearvideo.c:256: error: Uninitialized Value
  The value read from has_ac[_] was never initialized.

libavcodec/clearvideo.c:256:13: 
254.     off = x * 8 + y * 8 * c->pic->linesize[1];
255.     for (i = 1; i < 3; i++) {
256.         if (decode_block(c, c->block, has_ac[i + 3], c->ac_quant) < 0)
                 ^
257.             return AVERROR_INVALIDDATA;
258.         if (!x) {
