frand             399 libavfilter/vf_deband.c             const float r = frand(x, y);
frand            1002 libavfilter/vf_xfade.c static float frand(int x, int y)
frand            1020 libavfilter/vf_xfade.c             const float smooth = frand(x, y) * 2.f + progress * 2.f - 1.5f;          \