by trythil » Sat Jan 04, 2003 1:24 am
Depending on how you've set your parameters, yes, that is supposed to happen.
The first pass encode writes out bitrate curve data (which contains, among other things, how many bits are distributed per frame) and, if you tell XViD to, a first pass video.
The second pass uses the parameters you give the encoder (e.g. I-frame boost, which says how many more bits to give keyframes, curve compression percentages, which basically says how to skew the bitrate curve for the high and low-motion scenes, and so on) to optimize the bitrate curve for whatever condition you give it (for example, 2nd pass Int. allows you to specify a target file size).
In many cases, this can reduce the size of the video stream so much that, even with audio attached (and audio really isn't all that large in comparison to video, especially given modern compression techniques), the second-pass video is still smaller.
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