# Cannot playback 4K video in mkv format on VOD stream

**URL:** <https://community.wowza.com/t/cannot-playback-4k-video-in-mkv-format-on-vod-stream/55630>\
**Category:** Wowza Streaming Engine\
**Tags:** vod\
**Created:** [July 23, 2020, 1:03pm UTC](https://community.wowza.com/t/cannot-playback-4k-video-in-mkv-format-on-vod-stream/55630 "2020-07-23T13:03:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mohamed\_Hasan\_Adnan](https://avatars.discourse-cdn.com/v4/letter/m/e68b1a/32.png) [@Mohamed\_Hasan\_Adnan](https://community.wowza.com/u/Mohamed_Hasan_Adnan)\
**Post date:** [July 23, 2020, 1:03pm UTC](https://community.wowza.com/t/cannot-playback-4k-video-in-mkv-format-on-vod-stream/55630/1 "2020-07-23T13:03:16Z")

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Hi,

I just uploaded a 4k video to /content/ folder of the server and I am unable to playback the video.

when i try to open this link rtsp://103.35.99.179:1935/vod/Greyhound-4K.mkv

It says “Video failed to play” on my Android phone.

Any help would be appreciated.

I have another video with mp4 format in the same folder and it streams without any issue.

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**Author:** ![Amara\_Graham](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/amara_graham/32/381_2.png) [@Amara\_Graham](https://community.wowza.com/u/Amara_Graham)\
**Post date:** [July 23, 2020, 1:19pm UTC](https://community.wowza.com/t/cannot-playback-4k-video-in-mkv-format-on-vod-stream/55630/2 "2020-07-23T13:19:38Z")

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Hi Mohamed,

.mkv files are not support for playback. Take a look at the support file formats, 3rd section down [https://www.wowza.com/products/streaming-engine/specifications](https://www.wowza.com/products/streaming-engine/specifications)