Clips out of Kling, Seedance and Dreamina don't always come at a clean frame rate, and that gets annoying the moment you cut them in with real footage or drop them into After Effects. FrameLock fixes that in one double-click.
Put the file in a folder with your .mp4 clips and double-click it. Every clip is re-timed to a clean, constant 24 or 25 fps, depending on which version you run.
Every frame in a video has a timestamp that says when it should be shown. In a normal 24 fps file those are perfectly even. In a lot of AI downloads they wobble a little, so your edit software has to guess, and sometimes it shows a frame twice or skips one. That's the stutter.
Same frames, same pixels. FrameLock only rewrites the timestamps so every frame sits exactly on the grid.
Every source frame is kept exactly once: nothing dropped, nothing duplicated, no interpolation.
No re-encode. The video is copied bit for bit and only the timing is rewritten, so there's zero quality loss and the file stays the same size.
The result is saved next to the original as name_25p.mp4 (or _24p). Your originals are never touched, and clips that were already converted are skipped.
If a clip's timing is too irregular to fix this way, it falls back to a ProRes 422 HQ version (name_25p.mov). That still keeps every frame, it's just a much bigger file.
Audio
If a clip already runs at about the target frame rate, its length stays the same and the audio is kept. If not, the clip gets a little faster or slower, and the audio is removed because it would no longer be in sync.
Windows
Unzip, drop FrameLock_24p.bat or FrameLock_25p.bat in the folder with your clips and double-click it. It needs ffmpeg: it uses ffmpeg.exe and ffprobe.exe next to the .bat, or ffmpeg on your PATH. If it can't find either, it offers to install ffmpeg with winget, Windows' own package manager. Nothing is installed unless you press Y, and you don't need admin rights.
Mac
Same idea, with FrameLock_24p.command or FrameLock_25p.command. It looks for ffmpeg next to the file, in Homebrew or on your PATH. If it's missing, it offers to install it with Homebrew, or to download a static build into ~/Library/Application Support/FrameLock. Again, nothing happens unless you press Y, and no admin password is needed.
The first time, macOS may say it can't open the file because it's from the internet. Right-click it, choose Open, and confirm. After that a double-click works.
Questions
Why do Kling and Seedance clips stutter in After Effects or Premiere?
Every frame in a video has a timestamp. In many AI downloads those timestamps are slightly uneven, so the file reads as something like 24.06 fps. Your edit software has to guess, and sometimes it shows a frame twice or skips one. That is the stutter.
Does FrameLock lower the quality?
No. The video is copied bit for bit and only the timing is rewritten, so the image is exactly the same and the file stays the same size. Only if a clip is too irregular does it make a ProRes 422 HQ version instead, which also keeps every frame.
What happens to clips that are 30 fps?
They are re-timed to 24 or 25 fps with every frame kept, so they play a bit slower. The audio is removed in that case, because it would no longer be in sync.
Do I need ffmpeg?
Yes, but FrameLock looks for it and offers to install it for you if it is missing. Nothing is installed unless you say yes.
