# VOD audio bitrate

**URL:** <https://community.wowza.com/t/vod-audio-bitrate/41186>\
**Category:** Wowza Streaming Engine\
**Created:** [August 1, 2014, 10:56pm UTC](https://community.wowza.com/t/vod-audio-bitrate/41186 "2014-08-01T22:56:45Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![hebrew\_878](https://avatars.discourse-cdn.com/v4/letter/h/ecc23a/32.png) [@hebrew\_878](https://community.wowza.com/u/hebrew_878)\
**Post date:** [August 1, 2014, 10:56pm UTC](https://community.wowza.com/t/vod-audio-bitrate/41186/1 "2014-08-01T22:56:45Z")

</div>

how can i adjust bitrate of a mp3 track to 32k,64k ?

i have uploaded 1 mp3 file to /usr/local/Wowza/content/sample.mp3

i have checked with VLC player rtsp://ip:1935/vod/mp3:sample.mp3

its not streaming smoothly also i checked with testplayers it shows bitrate 250+k may be that is the reason why its not playing smoothly?

---

<div class="post-metadata">

**Author:** ![Daren\_Johnson](https://avatars.discourse-cdn.com/v4/letter/d/ee59a6/32.png) [@Daren\_Johnson](https://community.wowza.com/u/Daren_Johnson)\
**Post date:** [August 1, 2014, 11:58pm UTC](https://community.wowza.com/t/vod-audio-bitrate/41186/2 "2014-08-01T23:58:15Z")

</div>

Hi,

You can’t adjust the bitrate with any server-side settings.

You could certainly try re-encoding it with ffmpeg like this to see if playback improves:

```auto
ffmpeg -i sample.mp3 -ab 64k sample_64k.mp3

```

Daren

---

<div class="post-metadata">

**Author:** ![Daren\_Johnson](https://avatars.discourse-cdn.com/v4/letter/d/ee59a6/32.png) [@Daren\_Johnson](https://community.wowza.com/u/Daren_Johnson)\
**Post date:** [August 3, 2014, 12:47pm UTC](https://community.wowza.com/t/vod-audio-bitrate/41186/3 "2014-08-03T12:47:45Z")

</div>

Hi,

You would use a .smil file to support different viewers/listeners bandwidth conditions,

This is also know as multiple bitrate or Adaptive Bitrate (ABR) support.

You would specify different file renditions in the .sml file to support different bitrates.

A file has to exist for each of the required bitrates.

This is explained in more detail [in this article.](https://www.wowza.com/docs/how-to-do-adaptive-bitrate-streaming)

Daren

---

<div class="post-metadata">

**Author:** ![hebrew\_878](https://avatars.discourse-cdn.com/v4/letter/h/ecc23a/32.png) [@hebrew\_878](https://community.wowza.com/u/hebrew_878)\
**Post date:** [August 2, 2014, 12:31am UTC](https://community.wowza.com/t/vod-audio-bitrate/41186/4 "2014-08-02T00:31:44Z")

</div>

> Hi,
> 
> You can’t adjust the bitrate with any server-side settings.
> 
> You could certainly try re-encoding it with ffmpeg like this to see if playback improves:
> 
> ```auto
> ffmpeg -i sample.mp3 -ab 64k sample_64k.mp3
> 
> ```
> 
> Daren

what is the use of .smil ?