# About audioindex settings

**URL:** <https://community.wowza.com/t/about-audioindex-settings/45858>\
**Category:** Wowza Streaming Engine\
**Created:** [August 27, 2015, 8:33pm UTC](https://community.wowza.com/t/about-audioindex-settings/45858 "2015-08-27T20:33:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Seung\_Su\_Lee](https://avatars.discourse-cdn.com/v4/letter/s/dc4da7/32.png) [@Seung\_Su\_Lee](https://community.wowza.com/u/Seung_Su_Lee)\
**Post date:** [August 27, 2015, 8:33pm UTC](https://community.wowza.com/t/about-audioindex-settings/45858/1 "2015-08-27T20:33:47Z")

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Hi all,

this is my first post 🙂

I have a question… about audioindex option.

Now… I have two MP4 file,

file 1 : have 1 audio channel

file 2 : have 4 audio channel.

When I play MP4 file on web by below option,

“rtmp~~~.mp4?audioindex=2”

then file 2, play 3 audio channel only. Good.

But file 1, play 1 audio channel, I think.(I expect no sound)

Can I setting to play file 1(audioindex=2) with no sound?

Regards

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**Author:** ![Michelle\_B](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/michelle_b/32/394_2.png) [@Michelle\_B](https://community.wowza.com/u/Michelle_B)\
**Post date:** [September 4, 2015, 4:08pm UTC](https://community.wowza.com/t/about-audioindex-settings/45858/2 "2015-09-04T16:08:41Z")

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Hi lss0369 and welcome to Wowza Forums!

Setting the audioindex to a non-existing track number should return a null track, which would result in no sound. When you tested this, did you still get an audio track in your playback?

Michelle