# Alternate Surround Audio in HLS and MPD SMIL **URL:** https://community.wowza.com/t/alternate-surround-audio-in-hls-and-mpd-smil/92949 **Category:** Wowza Streaming Engine **Created:** [March 9, 2021, 8:54am UTC](https://community.wowza.com/t/alternate-surround-audio-in-hls-and-mpd-smil/92949 "2021-03-09T08:54:01Z") **Posts on this page:** 2 **Page:** 1
### Author: ![Joost\_Sanders](https://avatars.discourse-cdn.com/v4/letter/j/9d8465/32.png) [@Joost\_Sanders](https://community.wowza.com/u/Joost_Sanders) #### Post date: [March 9, 2021, 8:54am UTC](https://community.wowza.com/t/alternate-surround-audio-in-hls-and-mpd-smil/92949/1 "2021-03-09T08:54:01Z")
Hi, We have ABR streams with mutiple audio and video bitrates and would like to add extra audio channels with surround sound in AAC and AC-3 formats. We’ve successfully made the SMIL for MPD but for HLS it’s giving us nightmares. Here’s what the (simplified) SMIL looks like for MPD: ``` ``` I’m not sure if we can misuse the audioRole this way but it works!\ How to change the SMIL so it also works for HLS. The [https://www.wowza.com/docs/how-to-use-alternative-audio-or-video-tracks-with-apple-hls-streams](https://www.wowza.com/docs/how-to-use-alternative-audio-or-video-tracks-with-apple-hls-streams) page does not explain how to maintain the different audio **and** video bitrates, and just add the two alternate audio channels. Anybody? Thanks at lot. ---
### Author: ![Rose\_Power-Wowza\_Com](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/rose_power-wowza_com/32/431_2.png) [@Rose\_Power-Wowza\_Com](https://community.wowza.com/u/Rose_Power-Wowza_Com) #### Post date: [March 11, 2021, 10:41pm UTC](https://community.wowza.com/t/alternate-surround-audio-in-hls-and-mpd-smil/92949/2 "2021-03-11T22:41:58Z")
Sorry you didn’t get an answer from the community, but this is a workflow that most folks may not have experience with. I know we’ve worked together with you in support tickets in the past, so I asked an engineer to take a peek at this post and they said it will require one. This a bit of a tricky configuration to nail down in the forums with wanting to create an HLS packetizer in parallel. It most likely requires a second SMIL file. Let’s proceed through a ticket though so we can have full access to your files/logs and properly test and give you the correct guidance. Thanks Joost. > **[Open a Support Ticket](https://www.wowza.com/support/open-ticket)** > > Open a Wowza suppor ticket so our technical support engineers worldwide can help you succeed with your Wowza software and services.