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It makes no sense to encode first pass with fixed_quant=2, because filesize is only little different than a fast pass. Xvid will automatically make a correction for this in 2nd pass.
Use Turbo only if encoding time is a issue, it will give slightly lower quality. 2 B-frames boost quality also, but they're already default nowadays.
Don't know if sixty percent is enough for you. I usually aim for 80-90 percent. But then again: I hate macro-blocks. You might like a higher resolution for instance.
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