Fix 'No Video with Supported Format and MIME Type Found' Error

If you’re a Firefox browser user encountering the frustrating "No video with supported format and MIME type found" error message, you're not alone. This issue affects video playback on a variety of platforms like Ubuntu Linux, Facebook, and Twitter. This article explains why this error occurs and offers troubleshooting steps to resolve it.

What Causes the Error?

This error began appearing for many users in 2019 with Firefox versions 68 and 69. It means Firefox is unable to play the video content due to one or more missing features. Here are some common reasons:

1. Outdated Browsers: HTML5 has introduced new standards, which older browser versions struggle to handle. Bugs from previous versions may also carry over if not addressed by updates.
2. Corrupted Cache and Cookies: Browsers store cached data and cookies to speed up page loading, but these can sometimes interfere with video playback if not cleared regularly.
3. Media Feature Pack Missing (Windows KN/N editions): The Windows KN and N editions lack certain media technologies, which Firefox relies on for video playback. Without this feature pack, you might encounter errors on video-heavy platforms.
4. Intrusive Extensions: Some extensions can interfere with normal video display, blocking or interrupting video playback.

Solutions to Fix the Error

• Fix 1: Clear Cache and Cookies
  • Open Firefox, go to Settings (three-bar menu > Settings).
  • Under Privacy & Security, scroll down to Cookies and Site Data.
  • Click Clear Data, then select Cached Web Content and Cookies.
  • Press Clear. Restart Firefox to see if the issue is resolved.

• Fix 2: Install Media Feature Pack for Windows KN/N Edition
  • If you’re using a Windows KN/N edition, download and install the Media Feature Pack from the official Microsoft website.
  • This pack includes essential media features required for video playback.

• Fix 3: Update or Reinstall Firefox
  • Outdated versions of Firefox are often the root cause of this error.
  • Update Firefox: Go to Help > About Firefox. If an update is available, Firefox will automatically download it.
  • Reinstall Firefox if updating does not resolve the issue: First, uninstall Firefox, then download the latest version from Mozilla’s website https://www.mozilla.org/.

• Fix 4: Disable Add-ons
  • Certain add-ons can interfere with video playback.
  • To disable add-ons, go to Settings > Add-ons and Themes. Disable any add-ons, then restart Firefox and try playing the video.

• Fix 5: Try Another Browser
  • If all else fails, try accessing the video in another browser like Chrome or Edge. This can be a temporary workaround while troubleshooting Firefox.