# Replacing audio in H264 stream?

**URL:** <https://community.wowza.com/t/replacing-audio-in-h264-stream/34027>\
**Category:** Wowza Streaming Engine\
**Created:** [August 27, 2014, 1:05pm UTC](https://community.wowza.com/t/replacing-audio-in-h264-stream/34027 "2014-08-27T13:05:23Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Dyonisius\_Visser](https://avatars.discourse-cdn.com/v4/letter/d/ba8739/32.png) [@Dyonisius\_Visser](https://community.wowza.com/u/Dyonisius_Visser)\
**Post date:** [August 27, 2014, 1:05pm UTC](https://community.wowza.com/t/replacing-audio-in-h264-stream/34027/1 "2014-08-27T13:05:23Z")

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Hi

I’m using Wowza to restream an H264 stream from an Axis Q1755 camera to YouTube.

This works, but H264 stream from the Axis has one audio channel (mono).

I’d like to have stereo sound. Any ideas how to go about doing this?

FYI we do have transcoding licenses, although we don’t need them anymore when pushing to YouTube as they do the transcoding.

Thanks

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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:** [August 27, 2014, 4:26pm UTC](https://community.wowza.com/t/replacing-audio-in-h264-stream/34027/2 "2014-08-27T16:26:18Z")

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Hi,

I don’t think this is possible at the moment.

You could pull the stream through FFMPEG first and use the map\_channel command such as this:

```auto
   -map_channel 0.1.0 -map_channel 0.1.0

```

which would map the input left channel to both output channels

There’s more info on using FFMPEG with Wowza Streaming Engine [here.](https://www.wowza.com/docs/how-to-use-ffmpeg-with-wowza-media-server-mpeg-ts%28MPEG-TS%29)

Daren