I'm getting mad! I tried several way to encode my last project, and also different x264 versions, but the problem is always there: the bit rate frequently spikes over 50mbps, hence is not BD compliant and that should be the case of standalone incompatibility!

I don't know why, as the --vbv-maxrate 40000 MUST prevent this... anyone has this problem?

So, I tried to lower the value, and for example if I use around 25000, spikes go up to 30/35mbps - well over this value, but at least BD compliant, finally...

I'm in the middle of the last encode with this value; it should be finished tomorrow, then I'll check bitrate spikes to see if they are below the 40mbps - strongly hope this, as total encoding time will be about 36 hours! I should upgrade my CPU, I know, but it's not the moment right now...