Convert 30 fps to 24 fps
To convert 30 fps to 24 fps, drop frames at a 5 : 4 ratio. The running time and audio stay the same.
How 30 to 24 fps conversion works
Frames are dropped at a regular interval to reach the lower rate. Running time and audio stay the same; motion gets slightly less smooth.
| Spec | Value |
|---|---|
| Frame ratio | 5 : 4 |
| Method | Drop frames |
| 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 30 fps | Frames at 24 fps | Output length |
|---|---|---|---|
| 1 second | 30 | 24 | 1 s |
| 10 seconds | 300 | 240 | 10 s |
| 1 minute | 1,800 | 1,440 | 1 min |
| 10 minutes | 18,000 | 14,400 | 10 min |
FFmpeg command
ffmpeg -i input.mp4 -vf fps=24 -c:a copy output.mp4Verified Oct 16, 2026against FFmpeg fps filter
Changelog
- : Published; FFmpeg command tested with FFmpeg 7.1.1.
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