What is the best way to display a poster image in a video element even if the aspect ratio of the poster image does not match the video element?

At this moment, the compatibility of this feature has been tested only in WebKit browsers.

When a poster image is applied to a <video> element using the poster attribute, it appears before the user starts playing the video (default behavior). However, if the aspect ratio of the poster image differs from that of the <video> element, whitespace or blackspace may be visible on the sides of the image (either horizontally or vertically), with the image being centered (also default behavior).

I am looking for a way to scale up this image (preferably using CSS) so that it fills the entire video element, similar to what the CSS3 property background-size: cover; achieves.

If you're still having trouble understanding, perhaps this JSFiddle example can clarify things: http://jsfiddle.net/jonnymilano/2w2CE/

I would also appreciate solutions that force the image into the video container, adjusting its height and/or width to match the dimensions of the video container. Although this approach might only partially resolve my problem.

htmlcsshtml5-video

Answer №1

After pondering over this question, I found your jsfiddle to be quite helpful in resolving the issue (except for IE's inability to display the poster image correctly).

The solution is to merge your provided code and designate the required poster image as the background of the video element while using a 2x2 transparent image as the actual poster.

For example:

<video controls poster="transparent.png"> 
   <source src="video.mp4" type="video/mp4"> 
   <source src="video.webm" type="video/webm"> 
</video>

and

video { 
   width:305px; 
   height:160px;  
   background:transparent url('poster.jpg') no-repeat 0 0; 
   -webkit-background-size:cover; 
   -moz-background-size:cover; 
   -o-background-size:cover; 
   background-size:cover; 
}

You can find more details on this topic at HTML5 Video and Background Images.

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