mov and m4v videos don't play
Open, Needs TriagePublic

Description

Issue started to happen after upgrading to stable version "2017 Week 2", for example the following sample mov video doesn't play:

For m4v, seems working in Firefox, some works in chrome, but not working in Safari:

Used to work on an older builder of phabricator.

See also T12079 and T12219, although I'm not sure if either of those are duplicates of this.