有没有办法在HTML5视频上设置缩略图？我想在比赛前看一些照片。我的代码看起来像这样：
<video width="470" height="255" controls>
<source src="video.mp4" type="video/mp4">
<source src="video.ogg" type="video/ogg">
<source src="video.webm" type="video/webm">
<object data="video.mp4" width="470" height="255">
<embed src="video.swf" width="470" height="255">
</object>
</video>
谢谢！
将poster="placeholder.png"添加到视频标记中。
<video width="470" height="255" poster="placeholder.png" controls>
<source src="video.mp4" type="video/mp4">
<source src="video.ogg" type="video/ogg">
<source src="video.webm" type="video/webm">
<object data="video.mp4" width="470" height="255">
<embed src="video.swf" width="470" height="255">
</object>
</video>
那样有用吗？
将preload="metadata"添加到您的视频标记，将第一帧#t=0.5添加到您的视频源：
<video width="400" controls="controls" preload="metadata">
<source src="https://www.w3schools.com/html/mov_bbb.mp4#t=0.5" type="video/mp4">
</video>如果您想将视频第一帧作为缩略图，则可以使用
Add #t=0.1 to your video source, like below
<video width="320" height="240" controls>
<source src="video.mp4#t=0.1" type="video/mp4">
</video>
注意：确保您的视频类型（例如：mp4，ogg，webm等）
我找到了我从你的例子和其他例子中得到的解决方案并做了这个：
<video id="video1" width="470" height="264" poster="video_poster.jpg" onclick="playPause()">
<source src="video.mp4" width="470" height="264" type="video/mp4" >
<source src="video.webm" type="video/webm" >
<source src="video.ogv" type="video/ogg" >
<object id="FlashID" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="470" height="264" >
<param name="movie" value="video.swf" >
<param name="quality" value="high">
<param name="wmode" value="opaque">
<param name="swfversion" value="11.0.0.0">
<!-- This param tag prompts users with Flash Player 6.0 r65 and higher to download the latest version of Flash Player. Delete it if you don’t want users to see the prompt. -->
<param name="expressinstall" value="../../Scripts/expressInstall.swf">
<!-- Next object tag is for non-IE browsers. So hide it from IE using IECC. -->
<!--[if !IE]>-->
<object type="application/x-shockwave-flash" data="video.swf" width="500" height="500">
<!--<![endif]-->
<param name="quality" value="high">
<param name="wmode" value="opaque">
<param name="swfversion" value="11.0.0.0">
<param name="expressinstall" value="../../Scripts/expressInstall.swf">
<!-- The browser displays the following alternative content for users with Flash Player 6.0 and older. -->
<div>
<h4>Content on this page requires a newer version of Adobe Flash Player.</h4>
<p><a href="http://www.adobe.com/go/getflashplayer"><img src="http://www.adobe.com/images/shared/download_buttons/get_flash_player.gif" alt="Get Adobe Flash player" width="112" height="33" /></a></p>
</div>
<!--[if !IE]>-->
</object>
<!--<![endif]-->
Unfortunately Your browser is old and does not support full video experience.
</object>
</video>
<script>
var myVideo=document.getElementById("video1");
var att=document.createAttribute("poster");
if (myVideo.error) {
switch (myVideo.error.code) {
case MEDIA_ERR_NETWORK:alert("Network error - please try again later.");break;
case MEDIA_ERR_DECODE:alert("Video is broken.."); break;
case MEDIA_ERR_SRC_NOT_SUPPORTED:alert("Sorry, your browser can't play this video."); break;
}
}
else
{
function playPause()
{
if (myVideo.paused)
{
myVideo.play();
att.value="";
myVideo.setAttributeNode(att);
}
else myVideo.pause();
}
}
</script>
很棒的工作。谢谢！
这似乎是一个额外的图像显示在那里。
你可以试试这个
<img src="/images/image_of_video.png" alt="image" />
/* write your code for the video here */
现在使用jQuery播放视频并将图像隐藏为
$('img').click(function () {
$(this).hide();
// use the parameters to play the video now..
})
<?php
$thumbs_dir = 'E:/xampp/htdocs/uploads/thumbs/';
$videos = array();
if (isset($_POST["name"])) {
if (!preg_match('/data:([^;]*);base64,(.*)/', $_POST['data'], $matches)) {
die("error");
}
$data = $matches[2];
$data = str_replace(' ', '+', $data);
$data = base64_decode($data);
$file = 'text.jpg';
$dataname = file_put_contents($thumbs_dir . $file, $data);
}
?>
//jscode
<script type="text/javascript">
var videos = <?= json_encode($videos); ?>;
var video = document.getElementById('video');
video.addEventListener('canplay', function () {
this.currentTime = this.duration / 2;
}, false);
var seek = true;
video.addEventListener('seeked', function () {
if (seek) {
getThumb();
}
}, false);
function getThumb() {
seek = false;
var filename = video.src;
var w = video.videoWidth;//video.videoWidth * scaleFactor;
var h = video.videoHeight;//video.videoHeight * scaleFactor;
var canvas = document.createElement('canvas');
canvas.width = w;
canvas.height = h;
var ctx = canvas.getContext('2d');
ctx.drawImage(video, 0, 0, w, h);
var data = canvas.toDataURL("image/jpg");
var xmlhttp = new XMLHttpRequest;
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
}
}
xmlhttp.open("POST", location.href, true);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.send('name=' + encodeURIComponent(filename) + '&data=' + data);
}
function failed(e) {
// video playback failed - show a message saying why
switch (e.target.error.code) {
case e.target.error.MEDIA_ERR_ABORTED:
console.log('You aborted the video playback.');
break;
case e.target.error.MEDIA_ERR_NETWORK:
console.log('A network error caused the video download to fail part-way.');
break;
case e.target.error.MEDIA_ERR_DECODE:
console.log('The video playback was aborted due to a corruption problem or because the video used features your browser did not support.');
break;
case e.target.error.MEDIA_ERR_SRC_NOT_SUPPORTED:
console.log('The video could not be loaded, either because the server or network failed or because the format is not supported.');
break;
default:
console.log('An unknown error occurred.');
break;
}
}
</script>
//Html
<div>
<video id="video" src="1499752288.mp4" autoplay="true" onerror="failed(event)" controls="controls" preload="none"></video>
</div>