Moodle - H5P interactive video error: Video format not supported.

Submitted by Ron Anywar on Thu, 02/26/2026 - 21:33
Forums: 
Bugs in content types

Hello,

We're seeing a 'Video format not supported' in different course areas where H5P Interactive Videos have been used. It happens in Chrome, Edge and Firefox. (Please see attachment 1 of 2)

I also noticed that the issue does not occur in our test Moodle environment. I checked the relevant matching courses / course areas in our test Moodle environment, and the H5P interactive video content worked correctly.

Additional information via developer tools:

Access to script at 'https://dok.js-cdn...' from origin 'https://mymoodle...' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

- 
It also happens when following the below steps:

  1. Visit a module page, enable 'Edit mode' > click + 'Add content' > 'Activity or resource'
  2. Via the Activity chooser, select 'H5P Interactive Content'
  3. Select 'Interactive video'
  4. 'Upload video file' and select/upload mp4 video
  5. 'Add interactions' - results in error (see attachment 2 of 2)

- Moodle version number: 4.5.10
- H5p version: mod_hvp (1.27.2) - 2024120900

Note: I downloaded and tested the 'MIB2 MP4 video files, VTT subtitle file' from: https://cdmdemo.contentdm.oclc.org/digital/collection/p15700coll2/custom...

Kind regards,

Ron A

Attachments: 
Image icon (Attachment 1 of 2) - Video-format-not-supported..png
Image icon (Attachment 2 of 2) - step-2-add-interactions-video-format-not-supported.png
otacke's picture

otacke

Fri, 02/27/2026 - 16:54

Access to script at 'https://dok.js-cdn...' from origin 'https://mymoodle...' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Are you sure that's related to the problem? Rather looks like some script cannot be loaded from a CDN because it requires proper headers to be sent. Having said that: I also downloaded the video from that site and can use it without any issues on https://sandbox.moodledemo.net/ and it also works when I use the video direct link (https://server15700.contentdm.oclc.org/dmwebservices/index.php?q=dmGetSt...)

Seems I can't help here.