>> 5. Are all of the options that are noted with (pass 1/2) in the man
>> disabled if you include them in the second pass? Or can they be
>> detrimental if you include them on a second pass?
>
> Generally it's safest (though slow) if pass 2 uses exactly the same
> parameters as pass 1. Using different parameters can (depending on the
> parameters) result in inexact statistics.
There's some leeway, though. See the 'turbo' option. Generally, omitting
high-quality options from the first pass will very slightly diminish the
quality of the second pass. It's just yet another trade-off between
quality and CPU time.
Try encoding with three passes if you want to use even more CPU time and
get very slightly better quality.
> I'm not sure what (pass 1/2) means - perhaps it's something to do with
> pass=3 encodings. Pass=3 works differently, perhaps it just doesn't
> need/use the parameters marked (pass 1/2)? Anybody know?
That just means they work with pass 1 and pass 2. ...and pass 3, since
three pass encoding was added later.
I can see how that could be confusing. I'm going to send a patch to
remove all instances of '(pass 1/2)'; it's valid to assume that an
option will work on all passes unless marked otherwise.
-Corey
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