Duplicate Frames: Requirements and Fixes

What causes duplicate frames

Duplicate frames happen when a video is exported at a different frame rate than the frame rate it was originally filmed or recorded at. Converting between frame rates forces the software to repeat certain frames to fill in the gap, which results in motion that looks jerky or unnatural.

Duplicate Frames Throughout

This is the more common pattern. It means the entire video was exported at the wrong frame rate, so frames are repeated at a regular interval across the full runtime.

How to fix it: Export the video at the same frame rate as your original source footage, not a converted one.

Quick reference:

• Source footage: 23.976 fps → Export: 23.976 fps ✅
• Source footage: 23.976 fps → Export: 29.97 fps ❌
• Source footage: 23.976 fps → Export: 25 fps ❌

If you're not sure what frame rate your source was shot in, check the original camera files or your editing project's sequence settings before exporting.

Duplicate Frames Occasionally

This pattern is more limited and isolated rather than spread across the whole video. It usually comes from mixed media, such as stock footage, archival clips, or VFX plates that were originally created at a different frame rate than the rest of your project, then cut into the timeline without being conformed.

Filmhub allows occasional duplicate frames for this reason. If they show up throughout the video instead of in isolated spots, that usually means the frame rate mismatch is affecting more than just a few inserted clips.

How to fix it: Conform any mixed-frame-rate clips to your project's frame rate before your final export, rather than leaving the conversion to happen automatically on export.

Still seeing duplicate frames after a re-export?

If your export already matches your source frame rate and you're still getting flagged, there may be an issue with how your editing software is handling the export itself (for example, an incorrect sequence setting or a corrupted render).