# Re-stream from IP camera with G711\_MULAW audio

**URL:** <https://community.wowza.com/t/re-stream-from-ip-camera-with-g711-mulaw-audio/37118>\
**Category:** Wowza Streaming Engine\
**Created:** [May 3, 2013, 9:27am UTC](https://community.wowza.com/t/re-stream-from-ip-camera-with-g711-mulaw-audio/37118 "2013-05-03T09:27:48Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Dan\_Burkett](https://avatars.discourse-cdn.com/v4/letter/d/838e76/32.png) [@Dan\_Burkett](https://community.wowza.com/u/Dan_Burkett)\
**Post date:** [May 3, 2013, 9:27am UTC](https://community.wowza.com/t/re-stream-from-ip-camera-with-g711-mulaw-audio/37118/1 "2013-05-03T09:27:48Z")

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Hi,

I’m re-streaming an H.264 IP camera with PCM audio through Wowza. When I view the stream in VLC from Wowza there is no audio track, but when I stream directly from the camera the audio track is present. Is the audio supposed to pass-through? I don’t think I’m doing anything in my configuration to disable it.

```auto
2013-05-03 09:27:02 EDT comment server INFO 200 - LiveStreamPacketizerCupertino.handlePacket[rtpudp/_definst/path/dlink]: Video codec:H264 isCompatible:true
2013-05-03 09:27:02 EDT comment server INFO 200 - LiveStreamPacketizerCupertino.handlePacket[rtpudp/_definst/path/dlink]: Audio codec:G711_MULAW isCompatible:false
2013-05-03 09:27:02 EDT comment server INFO 200 - LiveStreamPacketizerCupertino.handlePacket[rtpudp/_definst/path/dlink][avc1.66.30]: H.264 Video info: {H264CodecConfigInfo: codec:H264, profile:Baseline, level:3.0, frameSize:640x480, displaySize:640x480, frameRate:15.0}
2013-05-03 09:27:02 EDT comment server WARN 200 - CupertinoPacketHandler.handleHolder[rtpudp/_definst/path/dlink]: Invalid video/audio codec combination for iPhone/iPod: video:H264 audio:G711_MULAW
2013-05-03 09:27:02 EDT comment server WARN 200 - CupertinoPacketHandler.handleHolder[rtpudp/_definst/path/dlink]: Invalid audio codec for iPhone/iPod:G711_MULAW
2013-05-03 09:27:02 EDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[rtpudp/_definst/path/dlink]: Add chunk: id:1 mode:TS[H264,G711_MULAW] a/v/k:0/0/
2013-05-03 09:27:02 EDT comment server WARN 200 - RTPPlayer.describe: No audio packetizer[8]: G711_MULAW

```

Thanks,

Dan

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**Author:** ![Richard\_Lanham](https://avatars.discourse-cdn.com/v4/letter/r/c68b51/32.png) [@Richard\_Lanham](https://community.wowza.com/u/Richard_Lanham)\
**Post date:** [May 3, 2013, 2:53pm UTC](https://community.wowza.com/t/re-stream-from-ip-camera-with-g711-mulaw-audio/37118/2 "2013-05-03T14:53:43Z")

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Dan,

G.711 is only supported in Wowza by the Transcoder for decode. The transcoded streams will have AAC audio.

[https://www.wowza.com/docs/how-to-set-up-and-run-wowza-transcoder-for-live-streaming](https://www.wowza.com/docs/how-to-set-up-and-run-wowza-transcoder-for-live-streaming)

Testing with my axis m-1013 with audio set to “G711 µ-law” (which VLC shows as “PCM MU-LAW (mlaw)”), the audio is passed through to Flash clients.

It did not work in my IPhone 4s with current iOS version, contrary to a previous test. There is no audio and logs show it is not packetized.

Richard

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<div class="post-metadata">

**Author:** ![Richard\_Lanham](https://avatars.discourse-cdn.com/v4/letter/r/c68b51/32.png) [@Richard\_Lanham](https://community.wowza.com/u/Richard_Lanham)\
**Post date:** [May 3, 2013, 3:04pm UTC](https://community.wowza.com/t/re-stream-from-ip-camera-with-g711-mulaw-audio/37118/3 "2013-05-03T15:04:11Z")

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To add, in my test with that camera using g.711 u-law, Wowza packetizes the audio for smoothstreaming but the Silverlight player did not play it. For sanjosestreaming, Wowza packetizes the audio and the FlashHTTPPlayer (Wowza example) plays it, as expected. So:

RTSP: no

Flash RTMP and HTTP: yes

HLS: no

Smooth: no

Richard

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<div class="post-metadata">

**Author:** ![Dan\_Burkett](https://avatars.discourse-cdn.com/v4/letter/d/838e76/32.png) [@Dan\_Burkett](https://community.wowza.com/u/Dan_Burkett)\
**Post date:** [May 3, 2013, 10:17am UTC](https://community.wowza.com/t/re-stream-from-ip-camera-with-g711-mulaw-audio/37118/4 "2013-05-03T10:17:13Z")

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Thanks Richard.

The Transcoder AddOn isn’t an option for my application, so I’ll proceed with audio disabled.