Editorial / conform
Frame rate conform duration calculator
See how a clip runs when its frames are conformed—reinterpreted without frame blending or frame creation—at a new cadence.
Runs locallyNo sign-inFree
Browser-local toolVC / FRA
Production notes
What this result means
Calculate the new duration and speed change when existing frames are interpreted at another frame rate. Results are intended for planning and convenience; confirm critical values in your editing, encoding, or delivery system.
Useful for
- Planning 25-to-24 fps film conforms
- Estimating slow motion from high-frame-rate capture
- Checking audio duration changes after reinterpretation
Assumptions
- Every source frame is retained exactly once.
- Source frame count is rounded to the nearest whole frame.
- No optical flow, duplication, or frame blending occurs.
Limits & checks
- Audio pitch and resampling are not calculated.
- Variable-frame-rate sources need timestamp analysis first.
- NLE rounding and timebase behavior may differ at edit boundaries.
FAQ
Before the final export
Is conforming the same as frame-rate conversion?
No. Conforming changes playback speed; conversion tries to preserve duration by adding, dropping, or blending frames.
What happens to audio?
It changes duration with the picture unless separately time-stretched or replaced.
Why is 25 to 24 slower?
The same frames are displayed at fewer frames per second, so playback takes longer.