<description>This is intended for use in clips that have a significant number of duplicate content frames, but which differ due to noise. Typically anime has many such duplicates. By replacing noisy duplicates with exact duplicates, a bitrate reduction can be achieved.</description>
<description>This parameter defines the percentage change in the most different 32x32-pixel window that is enough to declare a frame a duplicate. The way to think about it is that if the threshold is (say) 7%, then if any 32x32 pixel area changes by 7% or more, it is not a duplicate, otherwise it is.</description>
<description>If this option is set to true, declared duplicates will be replaced with a single copy. If there is a string of duplicates, the last frame in the string is used for all copies... (If blend=true the copy frame will be generated by blending together all the duplicates in the string).</description>
<description>If this option is set to true, the copy behavior will be modified such that instead of using the last frame in the string of duplicates, a frame will be created and used from a blend of all the duplicates in the string. This is useful for noise reduction.... This option requires copy=true.</description>
