Also, not related to search, but to video duration and therefore possibly somehow related, this file is alleged by Commons to last 26 days. This is not, in fact, the case; it is 1h 46m long.

@Ijon that file is captured from a stream right ? The original is probably not well formed. I'll try and fix it.

Yup, claimed to be 643 hours long.. Remuxed with:
ffmpeg -i /Users/hartman/Downloads/WikiForHumanRights_2023_Capacity_Building_on_Building_Article_List_with_Petscan.webm -map 0 -map_metadata 0 -c copy out.webm

to fix the file metadata and uploaded the new version.

OK, this issue is because MediaSearch does not expect media files to be longer than an hour :)

/**
 * @return {string|null}
 */
formattedDuration: function () {
        var minutes,
                seconds;

        if ( this.duration ) {
                minutes = '0' + Math.floor( this.duration / 60 );
                seconds = '0' + this.duration % 60;
                return minutes.slice( -2 ) + ':' + seconds.slice( -2 );
        } else {
                return null;
        }
},

well technically.. longer than 99 minutes i guess.

Change 959052 had a related patch set uploaded (by TheDJ; author: TheDJ):

[mediawiki/extensions/MediaSearch@master] Fix duration indicator for media longer than 99 minutes

https://gerrit.wikimedia.org/r/959052

Change 959052 merged by jenkins-bot:

[mediawiki/extensions/MediaSearch@master] Fix duration indicator for media longer than 99 minutes

https://gerrit.wikimedia.org/r/959052