# MPEGH DASH streams have wrong aspect ratio for some formats (par and sar values are not as expected)

**URL:** <https://community.wowza.com/t/mpegh-dash-streams-have-wrong-aspect-ratio-for-some-formats-par-and-sar-values-are-not-as-expected/96672>\
**Category:** Wowza Streaming Engine\
**Created:** [November 27, 2023, 5:17pm UTC](https://community.wowza.com/t/mpegh-dash-streams-have-wrong-aspect-ratio-for-some-formats-par-and-sar-values-are-not-as-expected/96672 "2023-11-27T17:17:08Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Nicolas\_Bouget](https://avatars.discourse-cdn.com/v4/letter/n/a9adbd/32.png) [@Nicolas\_Bouget](https://community.wowza.com/u/Nicolas_Bouget)\
**Post date:** [November 27, 2023, 5:17pm UTC](https://community.wowza.com/t/mpegh-dash-streams-have-wrong-aspect-ratio-for-some-formats-par-and-sar-values-are-not-as-expected/96672/1 "2023-11-27T17:17:08Z")

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Hello,

We are integrated with Wowza 4.8.23+2 to produce streamable DASH streams from MP4 sources and recently we encountered an MP4 file that was not showing as expected.

The video is expected to show with aspect ratio 16:9 but it’s actually showing in 3:2.  
Analysing the media with MediaInfo, we can see that the aspect ratio is defined as 16:9 and the confusion probably comes from the fact that the WidthxHeight are 720x480 (ratio 3:2).

In the DASH manifest returned by Wowza, we see:

> \<AdaptationSet id=“0” group=“1” mimeType=“video/mp4” **width=“720” height=“480” par=“3:2”** frameRate=“30000/1001” segmentAlignment=“true” startWithSAP=“1” subsegmentAlignment=“true” subsegmentStartsWithSAP=“1”\>  
> \<SegmentTemplate presentationTimeOffset=“0” timescale=“90000” media=“segment\_ctvideo\_rid$RepresentationID$\_cs$Time$\_w117425203\_mpd.m4s” initialization=“segment\_ctvideo\_rid$RepresentationID$\_cinit\_w117425203\_mpd.m4s”\>  
> \<SegmentTimeline\>  
> \<S t=“0” d=“900900”/\>  
> \<S d=“900900” r=“11”/\>  
> \<S d=“345870”/\>  
> \</SegmentTimeline\>   
> \</SegmentTemplate\>  
> \<Representation id=“p0va0br1022582” codecs=“avc1.4d001f” **sar=“1:1”** bandwidth=“1022582” /\>  
> \</AdaptationSet\>

We would expect to see par=“16:9” (display aspect ratio) and sar=“32:27” (pixel aspect ratio).

Is there a way to configure Wowza so it would compute the par and sar values differently?  
Do you consider the current values as a bug?

Thank you