PVS-Studio warning V579 for ffdshow

void Assign(const AVSValue* src, bool init) {
  if (src->IsClip() && src->clip)
    src->clip->AddRef();
  if (!init && IsClip() && clip)
    clip->Release();
  // make sure this copies the whole struct!
  //((__int32*)this)[0] = ((__int32*)src)[0];
  //((__int32*)this)[1] = ((__int32*)src)[1];
  memcpy(this,src,sizeof(this));
}

Come on, you scoundrel, get copied, get copied!

This suspicious code was found in ffdshow project by PVS-Studio static code analyzer.
Warning message is:
V579 The memcpy function receives the pointer and its size as arguments. It is possibly a mistake. Inspect the third argument. avisynth.h 695

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/