# variable framerate HLS

**URL:** https://community.wowza.com/t/variable-framerate-hls/39778
**Category:** Wowza Streaming Engine
**Created:** [October 22, 2013, 5:02am UTC](https://community.wowza.com/t/variable-framerate-hls/39778 "2013-10-22T05:02:45Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![jason\_pinto](https://avatars.discourse-cdn.com/v4/letter/j/df705f/32.png) [@jason\_pinto](https://community.wowza.com/u/jason_pinto)
#### Post date: [October 22, 2013, 5:02am UTC](https://community.wowza.com/t/variable-framerate-hls/39778/1 "2013-10-22T05:02:45Z")

</div>

hi,

I am using Wowza-3.5.0 and I am able to do ABR HLS. I have a scenario whose details are given below:

stream 1 : bitrate = 800Kbps framerate = 30 key-frame-interval = 1 sec

stream 2 : bitrate = 400Kbps framerate = 25 key-frame-interval = 1 sec

stream 3 : bitrate = 100Kbps framerate = 15 key-frame-interval = 1 sec

So my query is, with the above scenario ( variable frame-rate across 3 streams and different bitrates ) is it possible to do HLS using wowza.? How does the Key-frame sync happens.?? Does wowza require equal framerate across all input streams for HLS?

Thanks in advance.

Jason

---

<div class="post-metadata">

### Author: ![sal\_jefferson](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sal\_jefferson](https://community.wowza.com/u/sal_jefferson)
#### Post date: [October 22, 2013, 7:45am UTC](https://community.wowza.com/t/variable-framerate-hls/39778/2 "2013-10-22T07:45:33Z")

</div>

As long as the key frames are aligned this should work.

You can check if the key frames are aligned by enabling these properties:

[How to debug encoder multi-bitrate key frame alignment](https://www.wowza.com/docs/how-to-debug-encoder-multi-bitrate-keyframe-alignment)

Salvadore