guardian/frontend — pull request #5562 by ironsidevsquincy (2014-08-14 10:34:16+00:00)
Title: Handle embedded video with bad mime type

e.g. http://www.theguardian.com/politics/2011/apr/01/jobcentres-tricking-people-benefit-sanctions

Needs to map `mp4` -> `video/mp4`