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The main reason why the VLC does not support the UNDF format error is the partial or incomplete download of the file we are trying to run. Why does VLC give VLC does not support UNDF format error? Mainly, it is being seen in the VLC player, when we try to run the file that is not completely downloaded and also the completely downloaded files. It means that the player cannot define the format and cannot recognize it. The UNDF file format is in fact the undefined file format. You will then receive the error message “No suitable decoder module: VLC does not support the” undf “video or audio format.
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In other words, the VLC media player cannot determine the correct codecs associated with your media file. But sometimes you can see that VLC does not support UNDF format error when trying to play a video or audio file. In fact, our hero can play all the most important audio and video files. VLC is one of the best video players we’ve come across. Check How to Fix ‘VLC Does Not Support undf Format’ Issue
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