# MPEG-DASH playback no audio output

**URL:** <https://community.wowza.com/t/mpeg-dash-playback-no-audio-output/48319>\
**Category:** Wowza Streaming Engine\
**Created:** [March 17, 2017, 10:04am UTC](https://community.wowza.com/t/mpeg-dash-playback-no-audio-output/48319 "2017-03-17T10:04:14Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![gang\_zhu](https://avatars.discourse-cdn.com/v4/letter/g/5daacb/32.png) [@gang\_zhu](https://community.wowza.com/u/gang_zhu)\
**Post date:** [March 17, 2017, 10:04am UTC](https://community.wowza.com/t/mpeg-dash-playback-no-audio-output/48319/1 "2017-03-17T10:04:14Z")

</div>

All

I put a mp4 media file to content folder, then check the playback using mpeg-dash and HLS , but there is no audio output when selecting mpeg-dash . At the same time, HLS playback is right, audio and video are correct.

MP4 file with h.264 video codec and aac audio codec

There is a error log:

HTTPStreamer/Properties boolean property mpegdashAdjustCTTSForFirstKeyFrameToZero to true WARNservercomment2017-03-1717:08:45-----439.775--------MediaReaderH264MPEGDash.indexFile[vod/_definst_/1vlc.mp4]: First frame of video has a non-zero CTTS value [80], playback may not work on all browsers, try setting HTTPStreamer/Properties boolean property mpegdashAdjustCTTSForFirstKeyFrameToZero to true

---

<div class="post-metadata">

**Author:** ![Alex\_C](https://avatars.discourse-cdn.com/v4/letter/a/bbe5ce/32.png) [@Alex\_C](https://community.wowza.com/u/Alex_C)\
**Post date:** [April 16, 2017, 5:22am UTC](https://community.wowza.com/t/mpeg-dash-playback-no-audio-output/48319/2 "2017-04-16T05:22:22Z")

</div>

Hi Gang,

Have you tried setting the referenced property to true?

In order to enable this property, you’ll need to add the following to the

/// section of the [install-

dir]/conf/[Appliation]/Application.xml:

```auto
<Property> 
	<Name>mpegdashAdjustCTTSForFirstKeyFrameToZero</Name> 
	<Value>true</Value> 
	<Type>Boolean</Type>
</Property>

```

Regards,

Alex