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doc/rate_distortion.txt  

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distortion + lambda*rate 
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For a fixed lambda, rate would represent the filesize, while distortion is 

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the quality. Is this equivalent to finding the best quality for a given max 

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rate is the filesize 

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distortion is the quality 

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lambda is a fixed value choosen as a tradeoff between quality and filesize 

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Is this equivalent to finding the best quality for a given max 

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filesize? The answer is yes. For each filesize limit there is some lambda 
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factor for which minimizing above will get you the best quality (using your 
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chosen quality measurement) at the desired (or lower) filesize. 
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