Can’t upload m4v or mp4 videos

Video upload gives error after taking full upload time goes to 99% then to an error page when uploading mp4 or m4v files well under the size limit
On safari led to a 404 page
On chrome server internal error and a 500 error while trying to use an errordocument to handle request
Running version 2.6.1

Hi @there1,

This is more of a general omeka question. Please see: