Resources
Blog & Guides
Real guides for every situation where a video is broken. We show the free methods too — even the ones that aren't ours.
Pillar guides
The complete overviews
Understanding the MP4 Container: moov, mdat, and Why Videos Break
What technically happens when an MP4 file breaks? An engineering deep-dive into the ISO-BMFF box structure, NAL units, and the repair algorithms behind modern video-repair tools.
Jonas Becker · Read more →
Pillar · May 19, 2026Repair a Damaged Video — the Complete Guide (2026)
Everything you need to know about repairing broken videos — from ffmpeg tricks through untrunc to professional tools. With an honest assessment of every method and concrete steps per damage type.
Thomas · Read more →
Use cases
7 articles
- Lena Schmidt
SD card: video gone or damaged — the right order
A recording vanished from the memory card or won't play? The mistake is usually the order. Recover first, then repair — here's when to do what.
- Lena Schmidt
iPhone video won't play: the checklist
An iPhone video is black, stutters, or won't open at all? Rule out the harmless causes first — then repair. Step by step, honestly ordered.
- Thomas
DiskDrill recovered a video — but it won't open. Why?
DiskDrill brought your videos back, but none of them play? Here are the two most common reasons — and how to fix them without ever touching DiskDrill again.
- Lena Schmidt
GoPro Crash on the Slope — Rescuing Footage When the Camera Gives Up
Hard crash with your GoPro: the recording cuts out, the next boot flashes RECOVERY mode, and the file won't play. Step-by-step guide for the first evening after the fall.
- Lena Schmidt
Wedding Video Broken — What to Do RIGHT NOW
The wedding video won't open, the day was one of a kind, and the client is waiting for the footage? Three steps for the first day — from backing up the card to picking the right tool.
- Thomas
Sony FX3 After a Card Crash: Step-by-Step Recovery
The FX3 dropped the card mid-shoot, a clip cut out, or DiskDrill handed back fragments? Here's the specific guide for repairing Sony XAVC-I and XAVC-S.
- Lena Schmidt
GoPro Video Won't Play: How to Rescue Your Footage (Battery Crash, SD Card Errors)
GoPro video won't play? Common causes, free rescue attempts, and when a dedicated tool is unavoidable. Explained step by step.
MP4 & container internals
3 articles
- Jonas Becker
Repair a MOV File: What Actually Works on a Mac
MOV won't open and QuickTime throws an error? Why MOV breaks the exact same way MP4 does, and which method works depending on the damage. With honest success rates.
- Thomas
moov atom missing: what it means and how to repair it
Your player says "file corrupted" or shows 00:00 length? The moov atom — the index of your MP4 — is probably gone. Here is how to spot the damage and fix it.
- Thomas
Repair an MP4 File: 7 Methods That Actually Work (2026)
Trying to rescue a broken MP4 file? These 7 methods — from the VLC trick to a pro tool — work in practice. With an honest success rate for each one.
Competitor reviews
3 articles
- Lena Schmidt
Aeroquartet Treasured Review: Is the Concierge Service Worth It?
Aeroquartet Treasured isn't a software product but a paid video-repair service — 49 to 700+ USD, 48h turnaround. When is it worth it, and when isn't it? An honest, hands-on test.
- Lena Schmidt
Recoverit Alternative for Video Repair: Where the Wondershare Tool Reaches Its Limits
Wondershare Recoverit is a broad data-recovery suite with a video-repair module. But where does it fall short? And which alternatives do more — especially with modern codecs?
- Lena Schmidt
Stellar Repair Alternative: Where Stellar Video Repair Reaches Its Limits
Stellar Repair is one of the best-known video-repair tools, but it shows its limits with modern professional codecs. An honest comparison with the alternatives, based on real test cases.