I can find the term 'peak frame rate' in some video editing software.
Are 'peak frame rate' and 'variable frame rate' the same thing?
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There are 'constant frame rate' and 'variable frame rate' both having obvious meanings: https://www.bandicam.com/support/tips/vfr-cfr/
When you use VFR then you can select which are the minim, averaged and maximum frame rates. And that maximum is the same as "peak" frame rate.