# this.f.setMediaKeys is not a function

**URL:** <https://community.wowza.com/t/this-f-setmediakeys-is-not-a-function/48705>\
**Category:** Wowza Streaming Engine\
**Created:** [May 11, 2017, 10:52am UTC](https://community.wowza.com/t/this-f-setmediakeys-is-not-a-function/48705 "2017-05-11T10:52:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Ian\_Jamieson](https://avatars.discourse-cdn.com/v4/letter/i/ba8739/32.png) [@Ian\_Jamieson](https://community.wowza.com/u/Ian_Jamieson)\
**Post date:** [May 11, 2017, 10:52am UTC](https://community.wowza.com/t/this-f-setmediakeys-is-not-a-function/48705/1 "2017-05-11T10:52:20Z")

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I am running WOWZA v4.6. on an Ubuntu 16.04 server. I am using the default VOD app.

When I try to play back MPEG-dash content through the built-in test player, the javascript console shows:

Uncaught (in promise) TypeError: this.f.setMediaKeys is not a function at of.k.Ja (eval at globalEval (jquery.js:4), :155:323) at X.eval (eval at globalEval (jquery.js:4), :126:502) at

There is nothing reported in the error log.

At some stage in the recent past this has worked. I appreciate that this may well be due to something else which has changed on the server, but I’m not sure where to start looking.

Any help gratefully received.

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**Author:** ![Ian\_Jamieson](https://avatars.discourse-cdn.com/v4/letter/i/ba8739/32.png) [@Ian\_Jamieson](https://community.wowza.com/u/Ian_Jamieson)\
**Post date:** [May 11, 2017, 11:30am UTC](https://community.wowza.com/t/this-f-setmediakeys-is-not-a-function/48705/2 "2017-05-11T11:30:23Z")

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Not a solution, but this appears to be an issue to do with Google Chrome, as the playback works in Firefox.

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<div class="post-metadata">

**Author:** ![Corey\_Marra](https://avatars.discourse-cdn.com/v4/letter/c/f04885/32.png) [@Corey\_Marra](https://community.wowza.com/u/Corey_Marra)\
**Post date:** [May 19, 2017, 9:11pm UTC](https://community.wowza.com/t/this-f-setmediakeys-is-not-a-function/48705/3 "2017-05-19T21:11:19Z")

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I removed that one line (c=this.f.setMediaKeys©;) from the js and it seems to work now. sure, it’ll probably break something down the line, but at least works as a temp workaround.