VLC does not support the audio or video format "undf"

After downloading a Video from Youtube this Pop Out on my VLC

No suitable decoder module:

VLC does not support the audio or video format "undf". Unfortunately there is no way for you to fix this.

VLC can't play the video the Video was not corrupt and downloaded completely.The 'undf' codec type for VLC just means that VLC did not recognize the format or, in other words, it is not one of the supported formats. 

"undf" is simply an abbreviation for "undefined" and is not a file format.

Supported searches :
◾How to fix VLC does not support the audio or video format “undf”
◾How to fix VLC does not support undf .mkv .flv .mov extensions

I had the same case with a video from youtube that I was trying to download using Google Chrome and a known download manager   ( IDM )which saved the file as .WEBM.

 I found the problem that  the Google Download Manager extension (add-on ) Don't know if it makes sense is not showing what kind of format you want to download. It only shows separate audio track and video track  only  see image below.

However, I tried with Firefox's add-on  Download Manager  Helper ( IDM ), and it saved the file as .MP4 , FLV , 3GP and it opened successfully.

This are  File example.......

How to Fix VLC does not support the audio or video format "undf"

Update your Downloader  and VLC to fix Bug.

To fix VLC does not support UNDF format error you have to first install all the appropriate audio and video codes on your system in order to support all the file formats efficiently. Therefore here below is Combined Community codec pack that provides you with all the necessary audio or video codes that are required to play almost every media file format available currently.

About Combined Community Codec Pack :

Combined Community Codec Pack is an all in one codec pack containing the following codecs: CoreWavPack, FFDShow Tryout, FLV Splitter, Haali Media Splitter, MPEG-2 Decoder, VSFilter. All these codecs were carefully chosen by CCCP Project so that this combination pack will offer a flawless playback of video and audio files. To ensure that this pack will work properly and that there won’t be any conflicts between the codecs, you will need to run the CCCP Insurgent utility which will detect all the existing codecs within your system and thus informing you about all the codecs that may act as a conflict with other codecs. Overall Combined Community Codec Pack is a simple yet efficient codec pack suitable for all the users.