How to repair a corrupted video file that will not play
Video File Repair diagnoses unplayable MP4s locally. Auto, Quick, Deep, and Smart modes — plus an optional same-camera reference. Not an enhancer.
The short answer
Video File Repair is for clips that will not play or that abort mid-file. Copy the original, import, pick Auto / Quick / Deep / Smart, optionally attach a healthy same-camera file, then Start Diagnosis. This is not AI Video Quality Repair. Download keeps the job on disk.

When file repair is the right first step
- The player errors out, or the timeline dies halfway
- The container looks intact but the index is gone
- You still have a copy you can import — this is not disk forensics
What diagnosis cannot do
- Recover a formatted drive or a zero-byte file
- Invent frames that were never written
- Replace quality repair, denoise, or upscale once the file already plays
How to run a diagnosis
- Copy the damaged file. Never overwrite the only original.
- Import it, start with Auto, attach a reference if you have one
- If it plays, enhance next. If not, try Deep/Smart or keep the copy for another tool
Experience on Your Own Footage
Download KwaFlux locally and render 1s, 3s, and 5s previews before you pay — 100% on your GPU without cloud upload.
Frequently asked questions
Is this the same as restoring old footage?
No. File repair tries to make a broken file playable. Restore old video is for grain, fade, and archival damage on files that already play.
Do I need a reference file?
No. It is optional. A healthy clip from the same camera can help the diagnoser guess structure.
Related in this topic cluster
Restore Old Video
Colorize, denoise, and deinterlace archival footage locally
Learn how it worksHow AI restoration fits into a premium production workflow
Notes on how targeted enhancement beats blanket filters, and why KwaFlux is designed around real production pressure rather than demo reels.
Learn how it worksHow we score video quality — and what VMAF actually measures
One "+30 points" number mixes repair with resolution jump. KwaFlux splits source, same-resolution repair, and gated delivery. VMAF is fidelity to a reference, not a glow-up.
Learn how it worksVideo File Repair
Diagnose first
Learn how it works