# ULL streams has no audio

**URL:** <https://community.wowza.com/t/ull-streams-has-no-audio/53177>\
**Category:** Wowza Developer Dojo\
**Tags:** wowza-streaming-server-java-api\
**Created:** [April 16, 2019, 3:53pm UTC](https://community.wowza.com/t/ull-streams-has-no-audio/53177 "2019-04-16T15:53:45Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Denis\_Khaletckii1](https://avatars.discourse-cdn.com/v4/letter/d/f14d63/32.png) [@Denis\_Khaletckii1](https://community.wowza.com/u/Denis_Khaletckii1)\
**Post date:** [April 16, 2019, 3:53pm UTC](https://community.wowza.com/t/ull-streams-has-no-audio/53177/1 "2019-04-16T15:53:45Z")

</div>

Hi,

I set and publish a stream (sent to engine using RTMP protocol) to the default live app instance (it has the stream file: 5cb42f878e1dd.stream with the stream address: rtmp://192.168.1.194:1935/dustin/5cb42f878e1dd):

```auto
liveAppDefaultInstance
	.getStreams()
	.setStreamName(stream, "5cb42f878e1dd.stream");

liveAppDefaultInstance
	.getStreams()
	.getStream("5cb42f878e1dd.stream")
	.publish();

```

and then try to watch it in wowza player. Video works but it has no sound. In console wowza player says:

ERROR: PlayerStreamer: unknown audioCodec

INFO: PlayerStreamer: creating sourceBuffers: videoCodec:avc1.4d001f audioCodec:

INFO: PlayerStreamer: canPlay video/mp4;codecs=“avc1.4d001f”: probably

although onCodecInfoAudio listener in the live app says that the stream has mp4a.40.2 audio codec. HLS streams works properly (video and audio). When I use the default audioonly transcoder it works properly but I cannot use transcoding on my production server.

Reproduced on Wowza Streaming Engine 4 Developer Edition 4.7.7.

---

<div class="post-metadata">

**Author:** ![Rose\_Power-Wowza\_Com](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/rose_power-wowza_com/32/431_2.png) [@Rose\_Power-Wowza\_Com](https://community.wowza.com/u/Rose_Power-Wowza_Com)\
**Post date:** [April 16, 2019, 4:14pm UTC](https://community.wowza.com/t/ull-streams-has-no-audio/53177/2 "2019-04-16T16:14:21Z")

</div>

May I ask what your encoder source is or tools you’re using to send the stream to Wowza?

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<div class="post-metadata">

**Author:** ![Denis\_Khaletckii1](https://avatars.discourse-cdn.com/v4/letter/d/f14d63/32.png) [@Denis\_Khaletckii1](https://community.wowza.com/u/Denis_Khaletckii1)\
**Post date:** [April 17, 2019, 8:05pm UTC](https://community.wowza.com/t/ull-streams-has-no-audio/53177/3 "2019-04-17T20:05:55Z")

</div>

I send the RTMP stream from an iOS device using VideoCore: [https://github.com/jgh-/VideoCore-Inactive](https://github.com/jgh-/VideoCore-Inactive)

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<div class="post-metadata">

**Author:** ![Rose\_Power-Wowza\_Com](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/rose_power-wowza_com/32/431_2.png) [@Rose\_Power-Wowza\_Com](https://community.wowza.com/u/Rose_Power-Wowza_Com)\
**Post date:** [April 17, 2019, 8:58pm UTC](https://community.wowza.com/t/ull-streams-has-no-audio/53177/4 "2019-04-17T20:58:24Z")

</div>

Also, please know that only certain audio codecs are ingested by Engine. Please see the following chart:

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<div class="post-metadata">

**Author:** ![Rose\_Power-Wowza\_Com](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/rose_power-wowza_com/32/431_2.png) [@Rose\_Power-Wowza\_Com](https://community.wowza.com/u/Rose_Power-Wowza_Com)\
**Post date:** [April 18, 2019, 3:39pm UTC](https://community.wowza.com/t/ull-streams-has-no-audio/53177/5 "2019-04-18T15:39:59Z")

</div>

Tech support would like you to submit a support ticket @Denis Khaletckii. We are not sure what you’re trying to accomplish from your info you have shared. Your post says ULL in the title and that requires a specific workflow with no transcoding involved. Tech support will assist you once you open a ticket.