# LL-HLS and SMIL file

**URL:** <https://community.wowza.com/t/ll-hls-and-smil-file/92014>\
**Category:** Wowza Streaming Engine\
**Created:** [September 28, 2020, 4:07pm UTC](https://community.wowza.com/t/ll-hls-and-smil-file/92014 "2020-09-28T16:07:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![David\_Bursa](https://avatars.discourse-cdn.com/v4/letter/d/9e8a1a/32.png) [@David\_Bursa](https://community.wowza.com/u/David_Bursa)\
**Post date:** [September 28, 2020, 4:07pm UTC](https://community.wowza.com/t/ll-hls-and-smil-file/92014/1 "2020-09-28T16:07:23Z")

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Hi, I’d like to have LL-HLS session using _cmafstreamingpacketizer_ but I have trouble when using it with smil file. The reason to use smil is quality detection/switching in HTML5 player (Theoplayer to be exact).

**Scenario 1** (pure LL-HLS mode)  
When pure LL-HLS application is configured in _Application.xml_ using `<LiveStreamPacketizers>cmafstreamingpacketizer</LiveStreamPacketizers>`, I can play separate streams using URL `https://<server>/<application>/<streamname>/playlist.m3u8`. That works fine and I have about 8s latency.  
But when I open smil file using URL `https://<server>/<application>/smil:<filename>.smil/playlist.m3u8`, playback never starts (although there is a content in manifest file)

**Scenario 2** (mixed LL-HLS / classic mode)  
When mixed application is configured in _Application.xml_ using `<LiveStreamPacketizers>cmafstreamingpacketizer, cupertinostreamingpacketizer</LiveStreamPacketizers>`, I can play separate streams using URL `https://<server>/<application>/<streamname>/playlist_sfm4s.m3u8`. Again that works fine.  
When I open smil file using URL `https://<server>/<application>/smil:<filename>.smil/playlist_sfm4s.m3u8`, the playback runs but with standard HLS latency 30-40s.

Did anyone encounter this? How to achieve low latency combined with SMIL file?

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**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:** [September 29, 2020, 3:30pm UTC](https://community.wowza.com/t/ll-hls-and-smil-file/92014/2 "2020-09-29T15:30:09Z")

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According to our sources at Theo Player @David_Bursa , they have not yet implemented support for Adaptive Bitrate Streaming or SMIL files. They are saying Q4 or late October, but it’s still being tested.

Here is a blog that Theo published on the topic and gives the same dates and explanation.

> **[LL-HLS Series: Implementing LL-HLS with ABR, Subtitles, DRM and SSAI](https://www.theoplayer.com/blog/implementing-ll-hls-abr-subs-drm-ssai)**
>
> In this blog, we discuss the advantages and limitations of implementing LL-HLS with ABR, Subtitles, DRM and SSAI.