Convert 24 fps to 25 fps
To convert 24 fps to 25 fps without dropping frames, play every frame at 25 fps. The video runs 4% shorter, so the audio must be time-stretched to match.
How 24 to 25 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 | 24 : 25 |
| Method | Speed change (keep every frame) |
| Running time | -4% |
| Audio | Audio is sped up to match with atempo=25/24, which keeps the pitch. Without it, the classic PAL speed-up raises the pitch by about 0.7 semitones. |
Frame counts
| Source length | Frames at 24 fps | Frames at 25 fps | Output length |
|---|---|---|---|
| 1 second | 24 | 24 | 0.960 s |
| 10 seconds | 240 | 240 | 9.600 s |
| 1 minute | 1,440 | 1,440 | 57.600 s |
| 10 minutes | 14,400 | 14,400 | 9.60 min |
FFmpeg command
ffmpeg -i input.mp4 -vf "setpts=24/25*PTS" -r 25 -af "atempo=25/24" output.mp4Verified Oct 16, 2026against FFmpeg setpts and atempo filters
Changelog
- : Published; FFmpeg command tested with FFmpeg 7.1.1.
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