file is File:GreenlandReel_Icebergs_2160APR.webm
Seems to have been recorded with width/height of 0, which is wrong -- I see the actual 4k sizes in the metadata. Not sure why it got misdetected.
Trying to use refreshImageMetadata.php doesn't update the width/height.
Manually re-uploading the file with importImages.php fails at recordUpload step.
Not sure how to fix other than manually changing the record or delete/reupload... will take another look later.
I remuxed the file with ffmpeg, and reuploaded the new file and it's happier. Looks like the cues didn't get written properly by the original conversion program.
$ ffmpeg -i GreenlandReel_Icebergs_2160APR.webm -f webm -vcodec copy -acodec copy greenland2.webm