This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

MP4 videos fail to play

  • 8 replies
  • 1 has this problem
  • 31 views
  • Last reply by sprain5494

more options

MP4 videos fail to play with the following error messages:

  1. No video with supported format and MIME type found.
  2. Video can't be played because the file is corrupt.
  3. NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005)
  4. Error no decoder found for audio/mp4a-latm

example video #1 on https://tekeye.uk/html/html5-video-test-page

other notes:

  • issue began a 1-2 weeks ago
  • issue does not exist on chrome browser
  • MP4 videos can be downloaded and played successfully in applications other than firefox
  • other video formats play successfully in firefox
  • issue persists in troubleshoot mode
  • issue persists with hardware acceleration on/off
  • issue persists with tracking protection on/off
  • media.mp4.enabled is set to true
MP4 videos fail to play with the following error messages: # No video with supported format and MIME type found. # Video can't be played because the file is corrupt. # NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005) # Error no decoder found for audio/mp4a-latm example video #1 on [https://tekeye.uk/html/html5-video-test-page https://tekeye.uk/html/html5-video-test-page] other notes: * issue began a 1-2 weeks ago * issue does not exist on chrome browser * MP4 videos can be downloaded and played successfully in applications other than firefox * other video formats play successfully in firefox * issue persists in troubleshoot mode * issue persists with hardware acceleration on/off * issue persists with tracking protection on/off * media.mp4.enabled is set to true

All Replies (8)

more options

It works for me. see screenshot Desktop or laptop Manufacture and Model?


Edition Windows 11 Pro Insider Preview Version 22H2 Installed on ‎30-‎Sep-‎22 OS build 25211.1010 Experience Windows Feature Experience Pack 1000.25211.1010.0

more options

jonzn4SUSE said

Desktop or laptop

desktop


jonzn4SUSE said

Manufacture and Model?

i built

more options

issue persists with new profile

Modified by sprain5494

more options

more notes:

  1. issue exists in 105.0
  2. video plays in 104.0.2, but not audio

Modified by sprain5494

more options

Can you update to the current version and see what happens? It works for me in Win7. see screenshot

more options

Did you test in Safe Mode?

more options

jonzn4SUSE said

Can you update to the current version and see what happens?

issue persists in 106.0.1

more options

jonzn4SUSE said

Did you test in Safe Mode?

issue persists in safe mode