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Originally posted by ((( atom )))
i have to check, if maybe all the noise possibly causes a slowdown. according to your fps-values at your resolution, i guess i should be able to encode a 512 width in 16:9 (dunno the exact height hy hard..).
i have a couple of more questions:
(1) is there any function similar to the autocrop-function of avisynth?
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mplayer -vf autocrop + some seeking will give you the cropped dimension, then do the real encode
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(2) how do you evaluate the final image dimensions? on the command-line you can't see anything like if there are black bars to crop and if it is anamorphic..
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I guess you want to keep AR, right?
well: if a movie has 720x576 @ 16/9 then it's rescaled to 1024x576.
So a cropped movie follows the proportion:
1024:cy = 720:y' ==>>> y' = (cy * 720) / 1024
where cy = the cropped y. Remember to crop to multiples of 4 and
to rescale to multiples of 16.
You can rescale to a lower value than 720, but the less you
scale the better the quality (the best choice is to only crop and
use the new :aspect=x/y: option in xvid4).
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(3) is there an easy way to make dual-channel audio-avis, let's say with an ac3 and a mp3 track?
having these points cleared, i could actually start thinking about a little more complex script that would work similar to autogk and crop, comp-test, decide over the final res, two-pass encode and mux and be whole.. 
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no: only 1 track