avformat-55.dll is part FFmpeg library windows 2.2.2 (a free software project consisting of a vast software suite of libraries and programs for handling video, audio, and other multimedia files and streams.)
Audacity(free, open source, cross-platform audio software) by Dominic Mazzoni and Roger Dannenberg at Carnegie Mellon University.
Failed to load shared library 'avformat-55.dll'(error 126)
It's an advanced audio coding file. cannot open it. you need to convert it to a supported audio file
Reinstall aucacity, download here(current version: 2.1.0, under the GNU General Public License)
Download avformat-55.dll and copy it to
C:\Program Files\FFmpeg for Audacity/
You can check Path to FFmpeg in launcher.ini (line 56):
or go to Prefernces > Libraries
If "FFmpeg Library Version" say "not found", download avformat-55.dll at this page and copy to FFmpeg library location.
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Got computer error message like:
"avformat-55.dll was not found"
"the procedure entry point avformat-55.dll error"
"avformat-55.dll could not be located"
"Cannot register avformat-55.dll"
at startup or shutdown or run program?
No "missing dll" anymore - Repair dll errors - How to fix windows dll corrupt on your windows xp,vista,2000/2003,win7, win8,win10