The MNM4 Codec is a copy protected codec. Here's what they say on their website: All March Networks media clips contain a secure hash (SHA-1) to detect tampering. Any editing of a media clip will invalidate the authentication and may render the file unsuitable for court purposes. The evidence review software company appears to have “changed” a codec by renaming it and dubbing it proprietary. As a result, standard media players can’t play their files. It seems pretty sketchy to me but it’s hard to get too upset when it only set us back a few minutes.

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This is a quick guide on which steps you can take to fix most file or codecs errors that you might be receiving when trying to play a given movie/multimedia file.
Can’t even open the file/your computer does not recognise the file type?
If the file type is entirely unkown to your computer, chances are that you do not have an appropriate media player installed for the file type in question (or the file isn’t even a media file in the first place, or it has been given a wrong file extension).
Check out our file extensions page to find out which file extensions can be handled by which media players.
Find out which codecs the file requires/if it’s even valid!
In our tools downloads section you can download several different programs that can tell you some important information about the file. Try AVIcodec, GSpot, MediaInfo, MovieCodec Codec Tool or another of the available multimedia file inspection applications.
These applications will be able to tell you which video codecs (by FOURCC) and audio codecs (by audio tag) that you will need to get installed on your computer.
Which video codec? Which audio codec?
FOURCC (ie. DIVX) means Four Character Code and is basically just a key/code that uniquely identifies a particular video codec or type of video codec.
To find out which video codec is identified by a particular FOURCC, check out our FOURCC page.
Audio tag is basically a number, which may be in decimal (ie. 26447) or hexadecimal (0x674f).
To found out which audio codec is identified by a given audio tag, check out our audio tags page
What then?
Well to fix your codec error, simply download the codecs that you are missing. This may very well fix the playback issues that you were having with the file. To find the files to download just follow the links on the FOURCC or audio tags pages, or browse our video codecs/audio codecs download sections directly
Alternatively, to this entire process of locating individual codecs and installing them, you can use one of the “all-in-one” media players such as VLC or Media Player Classic, available from our media players download section.

Summary: Are you unable to watch videos on computer or phone due to unsupported video codec error? Learn the best ways to fix unsupported video format or codec error on your Windows, Mac or Android.

It’s annoying to receive unsupported video codec or format errors as they don’t let you play videos.

‘Missing codec. An item was encoded in a format that’s not supported.’

‘Windows Media Player cannot play the file because the required video codec is not installed on your computer.’

‘A codec is required to play this file.’

‘Invalid File Format.’

An error occurred. Unsupported file format.’

You can get such error messages when trying to play a video on PC, Mac, Smart TV, Android or other devices. Unsupported format errors are also reported while trying to open a file in video editing tools.

Why does unsupported codec or format error occur?

The error as obvious with the messages, appears due to absence of a codec that is required to play the video file on your computer or smartphone.

Technically, a video file comprises a codec and a container. A container is the file format that contains the file metadata while codec is required to encode or decode the video data.

So if your media player or device doesn’t support the video format or codec, it won’t play the video file.

Other than lack of supporting codec, the invalid file format error may also appear when the video file is corrupt.

Mnm4 Codec Download

How to fix an unsupported video codec error?

There are various ways to deal with the unsupported format problem in videos.

Either convert the file format to one that is supported by your media player or change the player itself. You can also consider installing the supporting codec on your system to play the video s.

Below are the methods to fix unsupported codec error and play the videos on your device in any media player:

Method 1: Play video in another media player

Method 2: Download the missing codecs

How to download codec in Windows Media Player
How to download codec in VLC Player
Get codec pack for your PC or Mac

Method 3: Convert the video file format

Online video converters
Desktop video converters
Convert file format using VLC Player

Method 4: Repair video codec error using Stellar Repair for Video

Method 1: Play video in a different media player

Not every media player supports all video file formats. For instance, QuickTime Player only supports MOV, MPEG, some AVI, and WAV files. It cannot play other formats such as AVCHD, MKV or WEBM, etc.

Similarly, Windows Media Player won’t play FLV or FLAC files due to absence of their codecs.

If videos are giving codec error in one media player, try with another. May be the default media player of your device doesn’t support the video file format.

Get VLC Media Player to fix video codec error on Android, Mac or Windows. The player is compatible with most file formats including MP4, AVI, MKV, MOV, AVCHD, etc. You can even watch DVD movies on VLC Player.

There are many free open source multimedia players. Try 5K Player, PotPlayer, Winamp, KMPlayer, Roxio Popcorn, and others.

Also, you can search online, which media players support your video file format and install that on your system.

If video file gives unsupported codec error on Mac, right-click on the file. Click on ‘Open With’ option. Mac may suggest all the installed apps that can play the video.

Method 2: Download the missing video codecs

If the ‘video codec is not supported’ error appears on Windows or Mac, then download the codec.

Search the web for the supported codec of your video file type to install the right codec.

Another option is to install a complete codec pack such as K-Lite for Windows and Perian for Mac. A codec pack extends support for the default media player on your system. A pack would contain codec for almost all file formats.

However, be aware that there may be malicious ads for codec downloads. This can put your computer at risk. Make sure you download codecs from a trusted source, preferably from the manufacturer’s site.

Some players such as Windows Media player and VLC also have the provision for automatic download of codecs. You can try that as well.

Steps to fix video codec not supported in Windows Media Player:

Open Windows Media Player.
Go to Tools > Options.
Click on Player tab.
Select the Download codecs automatically check box and make sure you have a continuous internet connection.
Click OK.
Next, play your video file in the player. A message will prompt to install codec.
Click Install.