That could very possibly be the video encoding used by Apple or the 3rd party that might doing their bitrate specific video encoding. There are some incredible

That could very possibly be the video encoding used by Apple or the 3rd party that might doing their bitrate specific video encoding. There are some incredible anime specific codec's out there that do a great job and I would want them run instead of a standard encoder you might use for non-anime movies. There's a reason why dvd ripped and compressed anime looks so good.