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CRF is only "constant quality" when no other settings change. The "constant quality" refers to the encode you are doing right now, ie. the quality is constant throughout the entire encode. Its not constant when you change every other setting.
If you want to compare quality vs. size, do as I explained above, dial in settings that produce the same file size, and _then_ compare the quality of these. Then you can only begin to judge how different slow vs. fast is.
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LAV Filters - open source ffmpeg based media splitter and decoders
Last edited by nevcairiel; 22nd September 2019 at 12:53.
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