Overview#
I investigated how to publish videos with Omeka S, so this is a memorandum.
Standard Features#
Omeka S supports video out of the box.
Below is an example using the standard features.

I used the following mp4 file:
https://file-examples.com/storage/fe4e1227086659fa1a24064/2017/04/file_example_MP4_480_1_5MG.mp4
Specifically, the <video> tag was used as follows:
Similarly, when uploading a .mov file, it played successfully, though this may be browser-dependent.

IIIF Server#
By using the IIIF Server module, it becomes possible to deliver IIIF manifest files.
https://omeka.org/s/modules/IiifServer/
Install this along with Universal Viewer.
https://omeka.org/s/modules/UniversalViewer/
As a result, Universal Viewer is displayed as shown below, and the video can be viewed along with the metadata described in the manifest file.

Checking the Manifest File (v2)#
When checking the manifest file (v2) generated by the IIIF Server module, it was displayed as follows:
Since v2 does not support video, it appears that Universal Viewer loads mediaSequences on its own to display the content.
Checking the Manifest File (v3)#
For v3, the output is as follows:
Since v3 supports video, you can load the same manifest file into viewers such as Mirador 3 for display, as shown below.

Summary#
I hope this serves as a useful reference for delivering video content with Omeka and IIIF.