Here is the same clip encoded with 1913 and 2074. The bug is fairly easy to produce with high contrast areas. http://koti.mbnet.fi/respekkt/Artefact-testing-1080i.2-pass.10000kbps.x264-1913.mp4 http://koti.mbnet.fi/respekkt/Artefact-testing-1080i.2-pass.10000kbps.x264-2074.mp4