# WebRTC playback when using a transcoder

**URL:** <https://community.wowza.com/t/webrtc-playback-when-using-a-transcoder/94824>\
**Category:** Wowza Streaming Engine\
**Tags:** transcoder, webrtc\
**Created:** [April 13, 2022, 6:57am UTC](https://community.wowza.com/t/webrtc-playback-when-using-a-transcoder/94824 "2022-04-13T06:57:01Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![John\_Norris2](https://avatars.discourse-cdn.com/v4/letter/j/e79b87/32.png) [@John\_Norris2](https://community.wowza.com/u/John_Norris2)\
**Post date:** [April 13, 2022, 6:57am UTC](https://community.wowza.com/t/webrtc-playback-when-using-a-transcoder/94824/1 "2022-04-13T06:57:02Z")

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Hey Guys, Im struggling to get a decent picture when using a transcoder & WebRTC Playback, My Workflow is as follows,

Stream a Master RTMP Stream Either 1080i50 OR 1080p25 approx 10mbit to Wowza Streaming Engine, This then is sent to destination via a stream target, And its also sent to a transcoder → h264 .5mbit low res for Webrtc playback in realtime on mobile devices, the video attached is the result, I have been able to fix it using VP9 but then the colours are all off hue. Anyone experience this?

Video Capture  
[https://drive.google.com/file/d/1XoRsArihT2kNLkcIXJLCwlwckp4l-mO2/view?usp=sharing](https://drive.google.com/file/d/1XoRsArihT2kNLkcIXJLCwlwckp4l-mO2/view?usp=sharing)

This is on windows using chrome, But the results are the same usng mobile and other browsers  
If i play the transcode using vlc and rtmp - the playback is fine. so only using webrtc

Thanks in advance

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**Author:** ![Peter\_Zsolnay](https://avatars.discourse-cdn.com/v4/letter/p/7ba0ec/32.png) [@Peter\_Zsolnay](https://community.wowza.com/u/Peter_Zsolnay)\
**Post date:** [May 9, 2022, 8:31pm UTC](https://community.wowza.com/t/webrtc-playback-when-using-a-transcoder/94824/2 "2022-05-09T20:31:46Z")

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Sorry for the new topic… I have exactly same results like this video.

[http://community.wowza.com/t/webrtc-jerky-and-or-inverted-with-transcoder/94927](http://community.wowza.com/t/webrtc-jerky-and-or-inverted-with-transcoder/94927)

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**Author:** ![Peter\_Zsolnay](https://avatars.discourse-cdn.com/v4/letter/p/7ba0ec/32.png) [@Peter\_Zsolnay](https://community.wowza.com/u/Peter_Zsolnay)\
**Post date:** [May 10, 2022, 3:26pm UTC](https://community.wowza.com/t/webrtc-playback-when-using-a-transcoder/94824/3 "2022-05-10T15:26:12Z")

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I tested with many different source stream, e.g.

- RTSP H.265 CCTV
- RTMP from OBS H.264
- with VBR, CBR, sRGB, 601 color space…

all result was same. Jerky H.264 or broken VP9 colors.