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Old 13th April 2021, 11:43   #1  |  Link
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Join Date: Jul 2007
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Posts: 240
Which VP9's crf value corresponds to x264's crf 20?

I want to encode a 480p movie with VP9 in two passes.

Google recommends to use crf 34 for low quality encoding of 480p video, and crf 33 for medium quality:


I am also using '-tune-content film' option to optimize for grain.

Which crf value in VP9 corresponds to x264's crf 20?
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Old 14th April 2021, 02:52   #2  |  Link
Join Date: Jan 2006
Location: Portland, OR
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I doubt there's going to be a linear relationship. Even in x264 and x265, which have more in common than either does with VP9, similar subjective quality can be up to 5 CRF values apart.

And even within one encoder, a difference of 1 CRF isn't that visible; definitely smaller than the difference between "low" and "medium" quality. Those would be more like 6 CRF apart in x264 or x265.
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