[YouTube-API] Youtube thumbnail is stretched

I'm using this URL to get the thumbnail for youtube video. <img src="http://img.youtube.com/vi/KCm27AQwcCo/2.jpg">

But It's fixed in size and if I specify the width and height, the image it's a stretched out a bit. It's there a better way to get thumbnail image from youtube video?

Thanks a lot.  

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