What to disable in first pass

[Fugdefino]

I want to do a 2 pass encoding using the following options:

B-VOPs: 2, 1.5, 1
trellis
qpel
vhq mode 4
vhq for b frames too
motion search precision 6
Chroma motion
Chroma Optimizer

If I'm defining a constant quantizer (3-4) for the first pass only, are there any options I can disable/change to speed things up the first pass?

[Prettz]

Xvid's first pass already automatically disables a lot of options to make it a "turbo" first pass. Among them are, I believe, VHQ settings.

Definitely leave b-frame settings, trellis, qpel, chroma motion (maybe), and chroma optimizer unchanged. Chroma optimizer changes what the source picture looks like before it's encoded, so you definitely shouldn't change that.

[Fugdefino]

Xvid's first pass already automatically disables a lot of options to make it a "turbo" first pass. Among them are, I believe, VHQ settings.


I thought if you defined a zone with a constant quantizer for the 1st pass, the settings you're talking about aren't automatically disabled (i.e fast first pass doesn't happen)?