x264, 2 pass vs 3 pass

[slipknot!]

I always use sharktooth's DXVA-SD-Insane profile + 3-pass method for encoding DVDs. But it takes much more time than 2-pass.
What does actually the third pass add to the final video? The better ipb frames arrengment or the more exact final bitrate (size) or what?

[Dark Shikari]

Nothing. It's a placebo.

[slipknot!]

Hmmm... So why don't you delete it in the next realise?

[LoRd_MuldeR]

Hmmm... So why don't you delete it in the next realise?

...because the x264 developers are not MeGUI developers. And because people out there want such insane/placebo profiles :p

[Sharktooth]

however... just to clear things up, there are no 3-pass presets in MeGUI. if you want one you have to create it.

[slipknot!]

There is no such a preset, but you can choose "automated 3pass mode" in the "Encoder settings (x264 configuration dialog)"

[nakTT]

There is no such a preset, but you can choose "automated 3pass mode" in the "Encoder settings (x264 configuration dialog)"
Yes. Thats what I did with my MEGui all these while. But since the developer himself told us that its a placebo, then from now on I can live happily with 2-pass knowing that 3-pass is not needed.

Nothing. It's a placebo.