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问题:

I have a video, and I want it to FILL 100% of the width, and 100% of the height. And keep the aspect ratio.

Is it possible that it at least fills 100% for both? And if a bit of the video has to be out of the screen to keep the aspect ratio, that doesn't matter.

HTML:

    <video preload="auto" class="videot" id="videot" height="100%" preload>
    <source src="BESTANDEN/video/tible.mp4" type="video/mp4" >
    <object data="BESTANDEN/video/tible.mp4" height="1080">
        <param name="wmode" value="transparent">
        <param name="autoplay" value="false" >
        <param name="loop" value="false" >
    </object>

CSS:

 .videof, .videot {
    width: 100%    !important;
    height: 100%   !important;
 }

回答1:

You can use Javascript to dynamically set the height to 100% of the window and then center it using a negative left margin based on the ratio of video width to window width.

http://jsfiddle.net/RfV5C/

var $video  = $('video'),
    $window = $(window); 

$(window).resize(function(){
    var height = $window.height();
    $video.css('height', height);

    var videoWidth = $video.width(),
        windowWidth = $window.width(),
    marginLeftAdjust =   (windowWidth - videoWidth) / 2;

    $video.css({
        'height': height, 
        'marginLeft' : marginLeftAdjust
    });
}).resize();

回答2:

By checking other answers, I used object-fit in CSS:

video {
    object-fit: fill;
}

From MDN (https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit):

The object-fit CSS property specifies how the contents of a replaced element should be fitted to the box established by its used height and width.

Value: fill

The replaced content is sized to fill the element’s content box: the object’s concrete object size is the element’s used width and height.

回答3:

video {
  width: 100%    !important;
  height: auto   !important;
}

Take a look here http://css-tricks.com/NetMag/FluidWidthVideo/Article-FluidWidthVideo.php

回答4:

This works for me for video in a div container.

.videoContainer 
{
    position:absolute;
    height:100%;
    width:100%;
    overflow: hidden;
}

.videoContainer video 
{
    min-width: 100%;
    min-height: 100%;
}

Reference: http://www.codesynthesis.co.uk/tutorials/html-5-full-screen-and-responsive-videos

回答5:

If you're looking for the equivalent to background-size: cover for video.

video {
  object-fit: cover;
}

This will fill the container without distorting the video.

^{PS: I'm extending on Leo Yu's answer here.}

回答6:

Easiest & Responsive.

<body>
  <video src="full.mp4" autoplay muted loop></video>
</body>
video {
  height: 100vh;
  width: 100%;
  object-fit: fill;
  position: absolute;
}

回答7:

I use JavaScript and CSS to accomplish this. The JS function needs to be called once on init and on window resize. Just tested in Chrome.

HTML:

<video width="1920" height="1080" controls>
    <source src="./assets/video.mp4" type="video/mp4">
    Your browser does not support the video tag.
</video>

JavaScript:

function scaleVideo() {
    var vid = document.getElementsByTagName('video')[0];
    var w = window.innerWidth;
    var h = window.innerHeight;

    if (w/16 >= h/9) {
        vid.setAttribute('width', w);
        vid.setAttribute('height', 'auto');
    } else {
        vid.setAttribute('width', 'auto');
        vid.setAttribute('height', h);
    }
}

CSS:

video {
    position:absolute;
    left:50%;
    top:50%;
    -webkit-transform:translate(-50%,-50%);
    transform:translate(-50%,-50%);
}

回答8:

This is a great way to make the video fit a banner, you might need to tweak this a little for full screen but should be ok. 100% CSS.

    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 1;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);

回答9:

I am new into all of this. Maybe you can just add/change this HTML code. Without need for CSS. It worked for me :)

width="100%" height="height"

回答10:

We tried with the below code & it works on Samsung TV, Chrome, IE11, Safari...

<!DOCTYPE html>
<html>
<head>
    <title>Video</title>
    <meta charset="utf-8" />
    <style type="text/css" >

        html,body {
          height: 100%;
          text-align: center;
          margin: 0;
          padding:0;
        }

        video {
            width: 100vw; /*100% of horizontal viewport*/
            height:100vh; /*100% of vertical viewport*/
        }

    </style>
</head>
<body>
        <video preload="auto" class="videot" id="videot" preload>
            <source src="BESTANDEN/video/tible.mp4" type="video/mp4" >
            <object data="BESTANDEN/video/tible.mp4" height="1080">
                <param name="wmode" value="transparent">
                <param name="autoplay" value="false" >
                <param name="loop" value="false" >
            </object>
        </video>
</body>
</html>