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.
You can also try to download and reinstall FFmpeg and lame. Click locate button, locate the forder where you install ffmpeg.
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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