Missing avformat-55.dll error solution for Windows

Please read the instructions carefully before you download the avformat-55.dll.Take the proper steps to safely clean and repair windows errors.

1. Where should this file go? After you download avformat-55.dll on your machine, paste it in directory where it missing, and also copy it to

Windows 95, 98, ME C:\Windows\System
Windows NT, 2000 C:\WinNT\System32
Windows XP, Vista, 7, 8 C:\Windows\System32
64-bit Windows C:\Windows\System64

If you can't find windows directory try:
a. Press and hold Windows key on your keyboard, then press button R.
b. Enter the command "cmd" and press Enter
c. In a command window enter the command "set systemroot" and press Enter. It will display system directory.
2. Go to "start" ==> "run" and type "regsvr32 avformat-55.dll" to register the file to the system.

File Information
  • Nameavformat-55.dll (avformat-55.dl_)
  • CategoryOperating System > dll
  • Description

    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.)

    Common error:

    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

    check ffmpeg pache for audacity

    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.

  • Filenameavformat-55.zip
  • Filesize636.11 kB
  • Filetypezip (Mime Type: application/zip)
  • Rating 4.7 / 5 , 1476 rating
  • MD5: 515504073cc6ab5a61bc0e12763467bb
  • SHA1: 6d8e2cac43dd668d831622feb8370a6f3da79cc2
  • SHA265: $5$rounds=5000$dlldownloadsyste$9dVqf6cphpvNXFwU2u5yHv5rAoTsnCbbUs/B2GqLQl9

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All possible solutions

Got computer error message like:

"avformat-55.dll crash"
"bad image"
"error loading"
"avformat-55.dll was not found"
"the procedure entry point avformat-55.dll error"
"avformat-55.dll could not be located"
"Access Violation"
"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

  • Download and install avformat-55.dll.
  • Download and install the latest update.
  • Install windows updates automatically/regularly, allow Windows check updates in the background.
  • Reinstall the application.