Windows media engine needs to be updated to claim support for "video/x-m4v" (an MPEG-4 synonym).
Created attachment 67950 [details] patch
Test skipped for now: http://trac.webkit.org/changeset/67745
http://trac.webkit.org/changeset/67745 might have broken Chromium Linux Release
Comment on attachment 67950 [details] patch Clearing review-queue flag since a similar patch was landed in changeset 67745 <http://trac.webkit.org/changeset/67745>.
Not sure why this bug was closed. The test isn't fixed yet, it's just being skipped.
<rdar://problem/8452012>
This test passes on current Windows code.