Quote:
Originally Posted by Chengbin
So they're the same? 2 pass is only to hit a specific file size? I thought the first pass is to analyze the video file to see where to distribute the bits or something like that.
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CRF, 1pass, and 2pass all use the same bit distribution algorithm. 2-pass tries to approximate CRF by using the information from the first pass to decide on a constant quality factor. 1-pass tries to approximate CRF by guessing a quality factor over time and varying it to reach the target bitrate.