ofs = FFMIN(ofs, destptr - destptr_bak);
cnt *= 4;
cnt = FFMIN(cnt, destptr_end - destptr);
- av_memcpy_backptr(destptr, ofs, cnt);
+ if (ofs) {
+ av_memcpy_backptr(destptr, ofs, cnt);
+ } else {
+ // Not known what the correct behaviour is, but
+ // this at least avoids uninitialized data.
+ memset(destptr, 0, cnt);
+ }
destptr += cnt;
}
maskbit >>= 1;