# Audio URL  for AAC

**URL:** <https://community.wowza.com/t/audio-url-for-aac/50294>\
**Category:** Wowza Streaming Engine\
**Created:** [December 5, 2017, 8:59pm UTC](https://community.wowza.com/t/audio-url-for-aac/50294 "2017-12-05T20:59:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Robert\_Hastings](https://avatars.discourse-cdn.com/v4/letter/r/f1d935/32.png) [@Robert\_Hastings](https://community.wowza.com/u/Robert_Hastings)\
**Post date:** [December 5, 2017, 8:59pm UTC](https://community.wowza.com/t/audio-url-for-aac/50294/1 "2017-12-05T20:59:43Z")

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For mp3 audios we have been using URLs in the form:

rtmp://hostName:1935/vod/_definst_/mp3:73/file.mp3

for AAC audio do we replace the “mp3:” with “aac:”

For example:

rtmp://hostName:1935/vod/_definst_/aac:73/file.aac

Can anyone point me to the documentation?

Thanks,

Bob

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<div class="post-metadata">

**Author:** ![Robert\_Hastings](https://avatars.discourse-cdn.com/v4/letter/r/f1d935/32.png) [@Robert\_Hastings](https://community.wowza.com/u/Robert_Hastings)\
**Post date:** [December 5, 2017, 9:05pm UTC](https://community.wowza.com/t/audio-url-for-aac/50294/2 "2017-12-05T21:05:10Z")

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Also, should the SMIL switch element look like this?