Using media-element --> Flashfallback fails

[georgringer]

Using the media-element on 4.7.1 with workaround from #Bug #37938 HTML5-output is fine in all browsers which can handle this. In Firefox flashfallback does not work and gives the User "File not found". If you take a look at the sourcecode you see the right path and if you copy the path to the browser, the right file is loaded. I tested it on 5 different installations (blank, fresh install, introductionpackage, updated from 4.6) and same error on all installations.

copy of https://forge.typo3.org/issues/38460