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13th April 2021, 11:43
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#1 | Link |
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None
Join Date: Jul 2007
Location: The Background
Posts: 240
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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: https://developers.google.com/media/vp9/settings/vod 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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14th April 2021, 02:52
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#2 | Link |
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Moderator
 Join Date: Jan 2006
Location: Portland, OR
Posts: 3,596
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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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