# Can not generating thumbnails with publish stream used video codec VP8

**URL:** <https://community.wowza.com/t/can-not-generating-thumbnails-with-publish-stream-used-video-codec-vp8/92011>\
**Category:** Wowza Streaming Engine\
**Tags:** webrtc\
**Created:** [September 28, 2020, 7:01am UTC](https://community.wowza.com/t/can-not-generating-thumbnails-with-publish-stream-used-video-codec-vp8/92011 "2020-09-28T07:01:01Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![chi\_nk2](https://avatars.discourse-cdn.com/v4/letter/c/6de8d8/32.png) [@chi\_nk2](https://community.wowza.com/u/chi_nk2)\
**Post date:** [September 28, 2020, 7:01am UTC](https://community.wowza.com/t/can-not-generating-thumbnails-with-publish-stream-used-video-codec-vp8/92011/1 "2020-09-28T07:01:01Z")

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In \*_[install-dir]/conf/VHost.xml file, I Put_  
   
_com.wowza.wms.transcoder.thumbnailer.HTTPProviderGenerateThumbnail  
thumbnail_  
none

And when I published stream with video codec H.264, I can get thumbnail via this link  
http://[my ip]:8086/thumbnail?application=live&streamname=sss&size=640x640&fitmode=letterbox&format=png

But when published stream with video codec VP8, I cannot get the thumbnail.

Please help me to check about this. Why VP8 can not get thumbnail.

Thanks

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**Author:** ![Remy\_G](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/remy_g/32/487_2.png) [@Remy\_G](https://community.wowza.com/u/Remy_G)\
**Post date:** [October 1, 2020, 12:56pm UTC](https://community.wowza.com/t/can-not-generating-thumbnails-with-publish-stream-used-video-codec-vp8/92011/2 "2020-10-01T12:56:34Z")

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As you see in the name of the module, this is transcoding functionality.  
So you need to transcode the WebRTC codec in something that can be read by the module.

If you transcode your WebRTC stream to h264 it will/should work.

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**Author:** ![Neha\_Parikh1](https://avatars.discourse-cdn.com/v4/letter/n/ccd318/32.png) [@Neha\_Parikh1](https://community.wowza.com/u/Neha_Parikh1)\
**Post date:** [September 30, 2021, 4:58pm UTC](https://community.wowza.com/t/can-not-generating-thumbnails-with-publish-stream-used-video-codec-vp8/92011/3 "2021-09-30T16:58:40Z")

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I am having issue capturing thumbnails for non transcoded, video codec h264. I am following steps mentioned in [https://www.wowza.com/docs/how-to-generate-thumbnail-images-of-live-streams](https://www.wowza.com/docs/how-to-generate-thumbnail-images-of-live-streams). The transcoded stream from mpeg4 to h264 works for capturing thumbnails.  
Any response would greatly appreciated!

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**Author:** ![Connessione](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Connessione](https://community.wowza.com/u/Connessione)\
**Post date:** [October 1, 2021, 11:40am UTC](https://community.wowza.com/t/can-not-generating-thumbnails-with-publish-stream-used-video-codec-vp8/92011/4 "2021-10-01T11:40:28Z")

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Read transcoded stream with ffmpeg and compare with non transcoded stream to see what are the differences in the codec properties.