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Video quality issue

test mis


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Hi Mohit and team.

We are still having video quality degradation issues, and I wonder if you can help us. 


We are broadcasting live video streams from Ant-server to Facebook but we find out the quality of that stream is not as high as when our users stream directly to Facebook without going through AntMedia.

Here is an example of one of our customers streaming via AntMedia to Facebook: https://www.facebook.com/mixedminglejewelry/videos/5047729518607552

And here's what their stream looks like when they go directly onto Facebook Live: https://www.facebook.com/mixedminglejewelry/videos/4299056140131647

It is the same phone and wifi connection in both videos. It might be hard to tell the quality difference, but here are side-by-side screenshots from the videos:

The one on the left is through AntMedia. And you can see it's not as crisp as the one on the right (user streaming directly to Facebook)

We are playing around with the Adaptive Bitrate Streaming (ex automatically adjust the resolution of video based on the user's internet speed... if internet is more than 1500 kbps video resolution, for example, we automatically adjust to 720p)

Can you make some suggestions on what else we can try to diagnose and improve the video quality? 



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Since you are using ABR, you can try by changing encoder settings and that should help you with it.

Ant Media Server is using veryfast preset that uses fewer CPU resources(disadvantage is less quality). You can change it and you can get better quality.

You can change the preset value from the config file (AMS-Folder/Application(LiveApp or etc)/WEB-INF/red5-web.properties ) with the following key.


For ex: You could use medium 

Let me know if it works for you.

Best Regards,
Mohit Dubey


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Hi Mohit,

Wanted to share an update. It does look like settings.encoding.preset=medium has improved the video/audio quality.

This one is before the preset=medium: https://www.facebook.com/keuthercrafts/videos/362988802231167
And this one is after the change: https://www.facebook.com/keuthercrafts/videos/315952476655452

It's noticeably better. And I made a screencast to compare the two:

Thank you so much for your help! We've been trying to improve the quality since Aug 11th. And I think we're finally seeing the improvement we were seeking!

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