# Audio problem on iOS and Windowphone device

**URL:** <https://community.wowza.com/t/audio-problem-on-ios-and-windowphone-device/44625>\
**Category:** Wowza Streaming Engine\
**Created:** [January 29, 2015, 11:36am UTC](https://community.wowza.com/t/audio-problem-on-ios-and-windowphone-device/44625 "2015-01-29T11:36:41Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Quang\_Huy\_Tran](https://avatars.discourse-cdn.com/v4/letter/q/ac91a4/32.png) [@Quang\_Huy\_Tran](https://community.wowza.com/u/Quang_Huy_Tran)\
**Post date:** [January 29, 2015, 11:36am UTC](https://community.wowza.com/t/audio-problem-on-ios-and-windowphone-device/44625/1 "2015-01-29T11:36:41Z")

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Dear Wowza-Team,

I am transcoding a live MPEG-TS stream (Video: H264, main profile; Audio: mp2, 48kHz, stereo) into the profile:

live.tv.stream {name:“360p”, bitrate:512000, codec:H264, profile:Baseline, level:3.0, frameSize:640x360, displaySize:640x360, frameRate:25.0}

live.tv.stream {name:“360p”, bitrate:96000, codec:AAC, objectType:LC, sampleRate:48000, channels:2}

The output stream is played well on Android device (both rtsp and http Cupertino streaming), but the audio is distorted (every about ten seconds i hear some “u u u…” sound over the original sound) when playing the stream on iOS (iPhone 3GS, 5), it also happens when i play on Test Player with Smooth streaming and a Windowphone device (Nokia Lumia 525).

I found a susgestion in this article [AAC audio distorted on iOS](http://community.wowza.com/t/-/36619), but this problem still happens.

When i try to transcode the input stream following this article [https://www.wowza.com/docs/how-to-use-vlc-as-a-live-stream-encoder-with-wowza-media-server-mpeg-ts](https://www.wowza.com/docs/how-to-use-vlc-as-a-live-stream-encoder-with-wowza-media-server-mpeg-ts) (my vlc transcode params: #transcode{venc=x264{keyint=60,profile=baseline,level=3.0,nocabac},vcodec=x264,vb=512k,height=360,width=640,acodec=mp4a,ab=96,channels=2,samplerate=48000}) and use Passthrough, i did not have this problem.

Any ideal for my problem?

Best Regards,

Huy.

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**Author:** ![Daren\_Johnson](https://avatars.discourse-cdn.com/v4/letter/d/ee59a6/32.png) [@Daren\_Johnson](https://community.wowza.com/u/Daren_Johnson)\
**Post date:** [January 28, 2015, 11:50pm UTC](https://community.wowza.com/t/audio-problem-on-ios-and-windowphone-device/44625/2 "2015-01-28T23:50:24Z")

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Hi,

Are you using a trial or a developer license?

Running with either of those licenses puts audio watermark tones in the stream every few seconds. Is that what you are hearing, or something else?

What live encoder are you using to provide the source stream?

Daren

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**Author:** ![Daren\_Johnson](https://avatars.discourse-cdn.com/v4/letter/d/ee59a6/32.png) [@Daren\_Johnson](https://community.wowza.com/u/Daren_Johnson)\
**Post date:** [January 29, 2015, 11:42pm UTC](https://community.wowza.com/t/audio-problem-on-ios-and-windowphone-device/44625/3 "2015-01-29T23:42:57Z")

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Hi,

With a Dev license you should certainly get the watermark tones if listening to a transcoded audio stream.

It doesn’t make sense that you wouldn’t hear the tones on an Android device, unless you were listening

to the source stream or passed-thru audio, but then I’m not sure if mp2 audio will stream/play on Android.

Daren

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**Author:** ![Quang\_Huy\_Tran](https://avatars.discourse-cdn.com/v4/letter/q/ac91a4/32.png) [@Quang\_Huy\_Tran](https://community.wowza.com/u/Quang_Huy_Tran)\
**Post date:** [January 30, 2015, 10:38am UTC](https://community.wowza.com/t/audio-problem-on-ios-and-windowphone-device/44625/4 "2015-01-30T10:38:40Z")

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Hi Daren,

Yes, i’m using a developer license. I hope that my problem is what you are talking about and I’m going to try a Transcoder AddOn Premium License soon.

But if as you said, why i did not hear that sound on Android device?

My source stream is provided by MPEG2 TV Encoder from television station.

Thanks for your support,

Huy.

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<div class="post-metadata">

**Author:** ![Quang\_Huy\_Tran](https://avatars.discourse-cdn.com/v4/letter/q/ac91a4/32.png) [@Quang\_Huy\_Tran](https://community.wowza.com/u/Quang_Huy_Tran)\
**Post date:** [January 30, 2015, 5:27pm UTC](https://community.wowza.com/t/audio-problem-on-ios-and-windowphone-device/44625/5 "2015-01-30T17:27:06Z")

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Hi,

I’m sorry, after listening carefully the transcoded stream, i also hear that tones.

And the mp2 audio can be played on Android.

Thanks,

Huy.