# HTML5 / HLS / mp4a.40.34 problem
**URL:** \
**Category:** Wowza Streaming Engine\
**Created:** [November 21, 2016, 12:29pm UTC](https://community.wowza.com/t/html5-hls-mp4a-40-34-problem/44659 "2016-11-21T12:29:38Z")\
**Posts on this page:** 1\
**Showing post:** 1
**Author:**  [@Francesco\_D\_Ambrosio](https://community.wowza.com/u/Francesco_D_Ambrosio)\
**Post date:** [November 21, 2016, 12:29pm UTC](https://community.wowza.com/t/html5-hls-mp4a-40-34-problem/44659/1 "2016-11-21T12:29:38Z")
Hi,
we’ve an issue trying to add HLS support on HTML5 desktop browser. We’ve mp3 audio-only files, and we’re trying to stream with Wowza 4.5 using jwplayer/hlsjs but mp3 stream doesn’t work.
It’ seems there’s an issue with hls manifest that set audio codec to “mp4a.40.34” which is not supported by Chrome and Firefox.
For example this manifest doesn’t work: [http://video.radioradicale.it/store-66/_definst_/mp3:2016/11/MP862180.mp3/playlist.m3u8](http://video.radioradicale.it/store-66/_definst_/mp3:2016/11/MP862180.mp3/playlist.m3u8)
```auto
#EXT-X-STREAM-INF:BANDWIDTH=63701,CODECS="mp4a.40.34"
```
instead this other stream works using hlsjs dev: [https://player.webvideocore.net/playlist.m3u8](https://player.webvideocore.net/playlist.m3u8)
```auto
#EXT-X-STREAM-INF:BANDWIDTH=63701
```
Demo: [https://nochev.github.io/hls.js/demo/?src=https%3A%2F%2Fplayer.webvideocore.net%2Fplaylist.m3u8&enableStreaming=true&autoRecoverError=true&enableWorker=true&levelCapping=-1&defaultAudioCodec=undefined](https://nochev.github.io/hls.js/demo/?src=https%3A%2F%2Fplayer.webvideocore.net%2Fplaylist.m3u8&enableStreaming=true&autoRecoverError=true&enableWorker=true&levelCapping=-1&defaultAudioCodec=undefined)
This is the discussion: [https://github.com/dailymotion/hls.js/pull/808#issuecomment-261555621](https://github.com/dailymotion/hls.js/pull/808#issuecomment-261555621)
how can we remove
```auto
CODECS="mp4a.40.34"
```
from mp3 hls manifest?
thanks
---
_[View the full topic](https://community.wowza.com/t/html5-hls-mp4a-40-34-problem/44659)._