The default for x264 is 23, so you can use this as a starting point.įfmpeg -i input.mp4 -c:v libx264 -crf 23 output.mp4 You can set the values between 0 and 51, where lower values would result in better quality (at the expense of higher file sizes). The Constant Rate Factor (CRF) is the default quality setting for the x264 encoder. Quick Summary: What is the Constant Rate Factor? Filed under: Definitions | Tags: CRF |ĬRF stands for Constant Rate Factor, x264’s best single-pass encoding method.
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