After downloading and processing the vimeo video, it generates HD, SD and HLS links. From time to time, it depends on many factors, such as the hosting environment, the player used for streaming videos, Internet bandwidth, etc. Etc.
So, first check the following things:
1) Do you use a third-party player to stream your videos?
2) Do you use HLS video calling for video streaming?
3) What is your hosting environment in terms of server response time?
Some suggestions for improving the video stream:
1) Get the best hosting plan that has the best server response time.
2) Use the default vimeo player for streaming videos.
3) If you are using a third-party player, than using the generated HLS vimeo communication with a third-party HLS player.
Some HLS Player Links
http://www.hlsplayer.net/
http://osmfhls.kutu.ru/
http://www.flashls.org/latest/examples/chromeless/
http://dailymotion.imtqy.com/hls.js/demo/
http://www.dash-player.com/demo/hls/
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