# webRTC jerky and/or inverted with transcoder

**URL:** <https://community.wowza.com/t/webrtc-jerky-and-or-inverted-with-transcoder/94927>\
**Category:** Wowza Streaming Engine\
**Tags:** transcoder, webrtc\
**Created:** [May 9, 2022, 8:21pm UTC](https://community.wowza.com/t/webrtc-jerky-and-or-inverted-with-transcoder/94927 "2022-05-09T20:21:23Z")\
**Posts on this page:** 5\
**Page:** 1

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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, 8:21pm UTC](https://community.wowza.com/t/webrtc-jerky-and-or-inverted-with-transcoder/94927/1 "2022-05-09T20:21:23Z")

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Hi,

I tested a webRTC application (with trial licence). An incoming H.264 RTMP (1080p@30fps 6000kbit) can be playback with webRTC in PC Chrome without any problem, that working very-very fine.

But if I set transcoding for that, happend:

to H.264 (540p@30fps 1200kbit) -\> jerky vibration in stream (only with webRTC, VLC can be play right!!!)  
to VP8 -\> inverted color (only the stream, the wowza logo overlay is right) and low qality squares stream  
to VP9 -\> better quality, also inverted colors, sometime 1-1 sec disintegration to squares

I do something wrong, or is something limitation in trial licence?  
(only 1 incoming, only 1 transcoded stream and 12 vcpu less than 20-50% load, 16Gbyte RAM…)

Thanks…

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**Author:** ![Rose\_Power-Wowza\_Com](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/rose_power-wowza_com/32/431_2.png) [@Rose\_Power-Wowza\_Com](https://community.wowza.com/u/Rose_Power-Wowza_Com)\
**Post date:** [May 10, 2022, 3:41pm UTC](https://community.wowza.com/t/webrtc-jerky-and-or-inverted-with-transcoder/94927/2 "2022-05-10T15:41:28Z")

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We suggest you only use VP9 for WebRTC playback, but as far as why you are seeing issues with the colors, we’ll need a support ticket to fully review your configuration and test, we cannot troubleshoot in the forums. It shouldn’t be related to the trial if you have SSL configured correctly.

> **[Open a Support Ticket](https://www.wowza.com/support/open-ticket)**
>
> Open a Wowza suppor ticket so our technical support engineers worldwide can help you succeed with your Wowza software and services.

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**Author:** ![Marcin\_Toczko](https://avatars.discourse-cdn.com/v4/letter/m/5f9b8f/32.png) [@Marcin\_Toczko](https://community.wowza.com/u/Marcin_Toczko)\
**Post date:** [May 10, 2022, 4:30pm UTC](https://community.wowza.com/t/webrtc-jerky-and-or-inverted-with-transcoder/94927/3 "2022-05-10T16:30:45Z")

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> [@Peter\_Zsolnay](#):
>
> to H.264 (540p@30fps 1200kbit) → jerky vibration in stream (only with webRTC, VLC can be play right!!!)

I also noticed this problem, it only occurs when the transcoder has the baseline profile set.

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<div class="post-metadata">

**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, 5:27pm UTC](https://community.wowza.com/t/webrtc-jerky-and-or-inverted-with-transcoder/94927/4 "2022-05-10T17:27:23Z")

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Thanks, but unfortunately, doesn’t help. If I used the main or high profile the player ([https://www.wowza.com/developer/webrtc/dev-view-play](https://www.wowza.com/developer/webrtc/dev-view-play)) cannot be play the stream. (It is a strange thing, generally we tested with a H.264 high profile stream without transcoder and worked well in chrome)

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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, 5:51pm UTC](https://community.wowza.com/t/webrtc-jerky-and-or-inverted-with-transcoder/94927/5 "2022-05-10T17:51:37Z")

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When I decreased to 720p the incoming stream and use high profile the H.264 worked (the VP9 was same bad colors).