I am running a SP2013 dev environment on Azure. Everything is working fine apart from not being able to play back videos in Safari for OSX.
1/ Upload movie (MP4) into assets library by selecting FILES -> New Document -> Video
2/ Video uploads ok and default frame 1 thumbnail is created
3/ Click on the play icon and nothing happens
However, I also have a SP online account and I can upload and play videos no problem using the same OS/Browser combo.
Note also that everything works fine with Chrome on OSX and IE and Chrome on Windows.
It therefore appears to be isolated to my standalone SP2013 install affecting OSX Safari.
Has anybody else come across this?