Convert 25 fps to 24 fps
To convert 25 fps to 24 fps without dropping frames, play every frame at 24 fps. The video runs 4.17% longer, so the audio must be time-stretched to match.
How 25 to 24 fps conversion works
Every frame is kept and simply played at the new rate, so the video runs faster or slower. Audio must be time-stretched (atempo) to stay in sync without a pitch change.
| Spec | Value |
|---|---|
| Frame ratio | 25 : 24 |
| Method | Speed change (keep every frame) |
| Running time | +4.17% |
| Audio | Audio is slowed to match with atempo=24/25, which keeps the pitch. Without it, a plain slowdown lowers the pitch by about 0.7 semitones. |
Frame counts
| Source length | Frames at 25 fps | Frames at 24 fps | Output length |
|---|---|---|---|
| 1 second | 25 | 25 | 1.042 s |
| 10 seconds | 250 | 250 | 10.417 s |
| 1 minute | 1,500 | 1,500 | 1.04 min |
| 10 minutes | 15,000 | 15,000 | 10.42 min |
FFmpeg command
ffmpeg -i input.mp4 -vf "setpts=25/24*PTS" -r 24 -af "atempo=24/25" output.mp4Verified Oct 16, 2026against FFmpeg setpts and atempo filters
Changelog
- : Published; FFmpeg command tested with FFmpeg 7.1.1.
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