scalenorm 191 B

1234
  1. sws_flags=+accurate_rnd+bitexact;
  2. testsrc=s=128x96 : d=1:r=5, format=yuv420p [a];
  3. testsrc=s=160x120 : d=1:r=5 [b];
  4. [a][b] concat=unsafe=1, scale=flags=+accurate_rnd+bitexact