# Recording video file with VP8+Opus can not play

**URL:** <https://discourse.lynckia.com/t/recording-video-file-with-vp8-opus-can-not-play/93>\
**Category:** Uncategorized\
**Created:** [June 30, 2015, 7:35am UTC](https://discourse.lynckia.com/t/recording-video-file-with-vp8-opus-can-not-play/93 "2015-06-30T07:35:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![xiliuxjtu2013](https://avatars.discourse-cdn.com/v4/letter/x/c57346/32.png) [@xiliuxjtu2013](https://discourse.lynckia.com/u/xiliuxjtu2013)\
**Post date:** [June 30, 2015, 7:35am UTC](https://discourse.lynckia.com/t/recording-video-file-with-vp8-opus-can-not-play/93/1 "2015-06-30T07:35:10Z")

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hi all  
in my licode service i used OPUS audio codecs by uncomment opus in

> <https://github.com/lynckia/licode/blob/master/erizo/src/erizo/SdpInfo.cpp>

  
[https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fging%2Flicode%2Fblob%2Fmaster%2Ferizo%2Fsrc%2Ferizo%2FSdpInfo.cpp&sa=D&sntz=1&usg=AFQjCNHlTvziyYd9Fx\_Bz91lhSYiBJTCiA](https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fging%2Flicode%2Fblob%2Fmaster%2Ferizo%2Fsrc%2Ferizo%2FSdpInfo.cpp&sa=D&sntz=1&usg=AFQjCNHlTvziyYd9Fx_Bz91lhSYiBJTCiA) ,  
and works fine. but when i recording video ,i can get the .mkv file, and  
the .mkv can be palyed. why?

Thanks!

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**Author:** ![jitendra\_swami](https://avatars.discourse-cdn.com/v4/letter/j/ec9cab/32.png) [@jitendra\_swami](https://discourse.lynckia.com/u/jitendra_swami)\
**Post date:** [July 10, 2015, 10:17am UTC](https://discourse.lynckia.com/t/recording-video-file-with-vp8-opus-can-not-play/93/2 "2015-07-10T10:17:01Z")

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Try converting your file to mp4 format it will work.On Tuesday, June 30, 2015 at 1:05:10 PM UTC+5:30, [xiliux...@gmail.com](mailto:xiliux...@gmail.com) wrote:

> hi all  
> in my licode service i used OPUS audio codecs by uncomment opus in  
> [https://github.com/ging/licode/blob/master/erizo/src/erizo/SdpInfo.cpp](https://github.com/ging/licode/blob/master/erizo/src/erizo/SdpInfo.cpp)  
> [https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fging%2Flicode%2Fblob%2Fmaster%2Ferizo%2Fsrc%2Ferizo%2FSdpInfo.cpp&sa=D&sntz=1&usg=AFQjCNHlTvziyYd9Fx\_Bz91lhSYiBJTCiA](https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fging%2Flicode%2Fblob%2Fmaster%2Ferizo%2Fsrc%2Ferizo%2FSdpInfo.cpp&sa=D&sntz=1&usg=AFQjCNHlTvziyYd9Fx_Bz91lhSYiBJTCiA) ,  
> and works fine. but when i recording video ,i can get the .mkv file, and  
> the .mkv can be palyed. why?
> 
> Thanks!