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Conversion of undf file format to flac file format beta

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Converter utilities capable of undf file to flac format conversion.

Undefined (UNDF) file types are typically partially downloaded, corrupted, or occasionally labeled as unknown by VLC player.

Unless the file is actually just renamed audio file, there is no way how to convert or recover that to FLAC. If you think the file is definitely audio, try to rename it to FLAC and play, if that doesn't work then there is really nothing you can do.

Updated: October 31, 2018

Unfortunately, there is no detailed software record in the database for this conversion.

This conversion entry was verified by us and conversion from undf to flac was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it can't be done because incompatibility between programs, caused by closed file formats, very limited support or by other problems.

If you find entry that you feel is flagged as bad wrongly, please tell us in the discussion form below with as much as information as possible so we can fix it.


Additional links: Open undf file, Open flac file


Files with undf file extension can be typically found as files in some kind of Undefined File Format. Most likely highly specialized.


A flac file extension is used for audio files compressed with the FLAC, aka Free Lossless Audio Codec. FLAC files do not lose any quality with their compression as MP3 do, but they are generally larger. Most modern media players support playback of FLAC files.


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