Small peak of 60mbps on x264 BD compliant encode - no problem?

[Lyris]

I'm aware that VBV allows for small peaks over the BD max bit rate of 40mbps, but I've never seen one this high before. It's right at the start of a trailer and spikes as high as 60mbps.

It was a 2-pass encode with --bluray-compat --vbv-maxrate 40000 --vbv-bufsize 30000 and --bitrate 38000 specified. Encoded with x264 core:115 r1995.

Cause for concern or A-OK?

[Dark Shikari]

The bitrate viewer probably isn't measuring the maximum bitrate in the context of the VBV. Use a VBV-compliant bitrate checker.

[LoRd_MuldeR]

I don't think that Bitrate Viewer is a suitable tool to check for VBV compliance. Did you check the resulting stream with a "real" VBV verifier?

Also: Did x264 throw any warnings? If x264 ever violates to VBV parameters you gave to it, there should be at least a warning message...

[Lyris]

Thanks, just what I needed to hear. I always wondered what the deal with these different results was, I didn't realise bitrate viewers could ignore VBV. I seem to remember Donald Graft wrote a VBV compliant one?

[LoRd_MuldeR]

Thanks, just what I needed to hear. I always wondered what the deal with these different results was, I didn't realise bitrate viewers could ignore VBV.

Well, they don't "ignore" VBV, they simply don't use the VBV model - it's a completely different thing.

I seem to remember Donald Graft wrote a VBV compliant one?

Yes, but you need a license. I think the DGDecNV license will work.

I think Elecard SteamEye Pro (http://www.elecard.com/en/products/professional/analysis/streameye-pro.html) can do it too. It's an expensive tool, but there's a demo available.

[Dark Shikari]

vbv.pl can do it, and it's free.