Convert 29.97 fps to 23.976 fps
To convert 29.97 fps to 23.976 fps, remove the 3:2 pulldown: every 5 video frames become 4 film frames. The running time and audio stay the same.
How 29.97 to 23.976 fps conversion works
The 3:2 pulldown added to turn 23.976 film into 29.97 video is removed: matching fields are rejoined and the duplicated frame in every group of five is discarded, recovering the original progressive frames.
| Spec | Value |
|---|---|
| Frame ratio | 5 : 4 |
| Method | Inverse telecine (remove 3:2 pulldown) |
| Running time | Unchanged |
| Audio | Audio is copied unchanged (-c:a copy); the running time does not change, so sound stays in sync. |
Frame counts
| Source length | Frames at 29.97 fps | Frames at 23.976 fps | Output length |
|---|---|---|---|
| 1 second | 30 | 24 | 1 s |
| 10 seconds | 300 | 240 | 10 s |
| 1 minute | 1,798 | 1,439 | 1 min |
| 10 minutes | 17,982 | 14,386 | 10 min |
FFmpeg command
ffmpeg -i input.mp4 -vf "fieldmatch=order=tff:combmatch=none,decimate" -c:a copy output.mp4Verified Oct 16, 2026against FFmpeg fieldmatch filter (inverse telecine)
Changelog
- : Published; FFmpeg command tested with FFmpeg 7.1.1.
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