How to fix an MP4 file to play

Written by alex zang
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How to fix an MP4 file to play
A corrupted MP4 may not play at all. (Jupiterimages/ Images)

You've downloaded a free MP4 video off the Internet, made some popcorn and double-clicked the file to start playback. Only, the file doesn't play back properly. It skips, and the audio doesn't match the video. The problem? Your MP4 file is corrupted. The solution? Download and install an MP4 repair program. These programs are able to go over an MP4 file and repair or replace missing bits of data, allowing a smooth playback.

Skill level:
Moderately Easy

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  1. 1

    Download and install NewLive All Media Fixer 9.13. The program is capable of finding and repairing the broken parts of MP4 files. Although a demo version is available, the full version of the program costs £19.40 as of March 2011. One of the downsides is what's known as a "nag screen," which appears at program start up until you buy the full version.

  2. 2

    Download Digital Media Recovery Software (see Resources). Like All Media Fixer, the program has a free trial version, though costs £31.8 if you want the full version. To repair your MP4 file, you'll need to start the program, select "MP4" from the file types, select the MP4 file you wish to repair and choose where to save it.

  3. 3

    Download and install MP4 Recovery. MP4 Recovery allows you to find and repair both corrupt MP4 files and patch over those that are missing data. The program is capable of fixing files located on CDs, DVDs and your hard drive. MP4 Recovery is available for use with Windows, Mac, Linux and Unix operating systems.

Tips and warnings

  • Not all MP4 files can be repaired. Those that are missing too much information are unlikely to ever have smooth playback.

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