In video streaming, for example, CRF can be used in a constrained/capped mode to prevent bitrate spikes. For other applications, other rate control modes are recommended.

You should use CRF encoding primarly for offline file storage, in order to achieve the most optimal encodes. A change of ☖ should result in about half/double the file size, although your results might vary. Is the file size too high? Choose a higher CRF. Is the quality good enough? No? Then set a lower CRF.

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